All tools

795 tools across 14 categories. Every one runs in your browser with nothing uploaded and no account required.

Charts & Diagrams

Cladogram Maker Draw cladograms from indented text or Newick format. Export as SVG or PNG. Stem and Leaf Plot Generator Stem and leaf plots with summary stats, split stems and back-to-back comparison. Dot Plot Maker Stacked dot plots with a frequency table. Known as a line plot in US maths. Matrix Diagram Maker 2x2 matrices with correct presets for Eisenhower, impact/effort and risk. Proximity Matrix Calculator Distance and similarity matrices with three measures and heatmap colouring. Pie Chart Maker Pie and donut charts with percentages on by default. Scatter Plot Maker Scatter plots with a fitted line, equation and correlation r. Radar Chart Maker Radar charts with overlaid series and an explicit scale. Histogram Maker Histograms with Sturges and Freedman-Diaconis auto-binning. Bar Chart Maker A bar chart from a paste, a CSV or a spreadsheet range, exported as PNG or SVG. Line Chart Maker A line chart from a paste, a CSV or a spreadsheet range, exported as PNG or SVG. Area Chart Maker An area chart from a paste, a CSV or a spreadsheet range, exported as PNG or SVG. Stacked Bar Chart Maker A stacked bar chart from a spreadsheet paste, showing both the parts and the total. Heatmap Generator A heatmap from a two-dimensional grid of values, coloured by size at a glance. Doughnut Chart Maker The same share-of-a-whole chart as a pie, with a hole in the middle for the grand total. Grouped Bar Chart Maker A grouped (clustered) bar chart from a spreadsheet paste, every bar sharing a zero baseline. Bubble Chart Maker A bubble chart for three numbers at once: position on two axes, and size for a third. Funnel Chart Maker A funnel chart from a simple label/value list, showing where a process loses people. Pyramid Chart Maker A pyramid chart from a simple label/value list - narrowest level at the top, widest at the bottom. Waterfall Chart Maker A waterfall chart from a label/value list, floating each step from the running total. Box Plot Maker A box plot from raw numbers, quartiles and outliers calculated using the standard Tukey method. Timeline Maker A timeline diagram from a simple date/description list - company history, project milestones, or any sequence of events. Org Chart Maker An organisational chart from plain indented text, drawn as boxes and connecting lines. Gantt Chart Maker A Gantt chart from a plain task list - no calendar dates needed, just start and end numbers. Venn Diagram Maker A two or three-circle Venn diagram from a simple labelled text list - built for comparing ideas, not calculating statistical overlaps. Mind Map Maker A mind map from plain indented text, branches fanning out from a centre topic. Sankey Diagram Maker A Sankey flow diagram from a plain source/target/value list - the stages are worked out automatically.

Practical Utilities

Bulk QR Code Generator Unlimited batch QR codes from a pasted list. Client-side, no signup, no expiry. Colony Counter Click-to-count plate tallying that converts straight to CFU/mL. Knitting Row Counter Several row counters at once, with automatic repeat tallying. Gallery Wall Layout Generator Gallery wall layouts with exact hook heights and a printable paper template. Keyboard Test Find dead keys, count presses, and test ghosting and n-key rollover. Clicker Counter Several named tally counters at once, keyboard operated. Seating Plan Generator Seating plans that explain any rule they cannot satisfy. Times Tables Worksheet Generator Printable times tables worksheets with a separate answer sheet. Badge Maker Badge designs with bleed and safe zone marked, exported at 300 dpi. Crochet Pattern Maker C2C and tapestry charts with the pattern in working order. Mouse Test Double-click fault detection first, then buttons, wheel and tracking. Mouse DPI Test A DPI measurement that tells you when it is not valid. Mechanical Keyboard Simulator Six switch characters, synthesised in the browser. Nothing recorded. Till Counter (Australia) Enter how many of each Australian note and coin are in the drawer and get the total, the banking, and the variance against your register. South African ID Number Validator Validates the structure and checksum of a 13-digit South African ID number. Patio Pattern Generator Enter your patio size and pattern, and get whole slabs, edge cuts and what to order. Invoice Generator Build an invoice, save it as a PDF or send it as a link, without an account and without anything leaving your browser. G1 Practice Test (Ontario) Original G1 practice questions from the official handbook, scored section by section. Year Planner Generate a wall-planner year, a single month or a blank weekly planner, ready to print. Chmod Calculator A two-way permissions grid with octal, symbolic notation, the special bits and a ready chmod command. Budget Planner Fill in income and expenses, see what's left instantly, and print or save the budget - with nothing uploaded. QR Code Generator Builds the exact URI scheme each payload type needs - a WhatsApp code that opens a chat, not just a code that happens to contain a WhatsApp-shaped URL. QR Code Scanner Decodes entirely from an image you choose, with no camera access and nothing sent to a server. YouTube Thumbnail Downloader Reads the video ID straight from the URL and links to YouTube's own public thumbnail files - no API key, no server round-trip on this site's part. Instagram Carousel Maker Splits left-to-right in normal swipe order, unlike a grid puzzle - the same tool's Instagram Grid Maker deliberately numbers its tiles in reverse. TikTok Size Guide Checks an actual image against TikTok's real profile-photo and cover-image specs, rather than just listing numbers in a table. Webcam Test Test your webcam: live picture, real resolution, measured frame rate. Microphone Test Test your mic: live level, clear verdict, 5-second play-back check. Speaker Test Test left, right and both channels, plus a 20 Hz-20 kHz sweep. Screen Resolution Checker Your real screen resolution, scaling, viewport, aspect ratio and refresh rate. Dead Pixel Test Fullscreen solid colours to find dead and stuck pixels and backlight bleed. Gamepad Tester Test every button, stick and trigger live. Spot drift, test vibration. Barcode Generator Make Code 128, EAN-13, UPC-A, EAN-8 and Code 39 barcodes and download them as SVG or PNG. Countdown Timer An online countdown timer with presets, a sound alarm and the time left in the tab title. ICS File Generator Create a calendar event as an .ics file with repeats and reminders, for any calendar app. Online Stopwatch An online stopwatch with laps, to 1/100 second, with keyboard shortcuts and CSV download. Password Strength Checker Check a password's strength in bits, with the weak patterns flagged and a crack-time estimate. Time Zone Converter Convert one time into many time zones, with UTC offsets and daylight saving handled for the date. vCard Generator Create a vCard (.vcf) contact file for phones, Outlook and Google Contacts. CPS Test - Clicks per Second Clicks per second test for 1 to 60 seconds, with best-second and totals. Reaction Time Test A five-round reaction time test with average and best in milliseconds. Typing Speed Test Typing speed and accuracy test with live WPM and downloadable results. Online Alarm Clock Online alarm clock with sounds, snooze and a calendar alarm download. Bingo Card Generator Custom bingo cards from your own words or numbers, as a printable PDF. Graph Paper Generator Printable graph, dot grid, lined and isometric paper as a vector PDF. Pomodoro Timer Pomodoro timer with adjustable focus and breaks, sound, tab title countdown and a log. Online Ruler An on-screen ruler calibrated to your screen with a bank card. Online Teleprompter A scrolling teleprompter with speed in words per minute, mirror and full screen. To-Do List Maker A simple task list saved in your browser, with copy and download. Multi Timer & Stopwatch Independent countdown timers plus a lap stopwatch, each pausing on its own. Invoice Number Generator Invoice numbers from a template - prefix, year and padding - with the sequence remembered in your browser. Business Card Generator Business card from form fields - print-true proportions, vCard download, nothing uploaded. Email Signature Generator Table-based HTML signature with plain-text fallback, built from a few fields. Privacy Policy Generator Privacy policy template built from your answers, with applicable clauses flagged and a clear disclaimer. Contract Template Generator Basic agreement assembled from your terms, ready to copy - with a plain review disclaimer. Printable Label Generator Address and shipping labels on a printable sheet grid, matched to standard layouts. Calendar Generator Printable monthly and yearly calendars with weekend marking, Monday or Sunday start, and your own events. Habit Tracker Daily habit check-ins with streaks, weekly completion rates and local-only storage. Keystroke Counter Counts every key press with running totals, per-minute rate and key-type breakdown. Interval Training Timer Work, rest and round counts with a clear phase readout and transition beeps. Contact List Deduplicator Duplicates found after normalising emails and phones, with every merge reported. Packing Checklist Generator A checklist built for the trip you are taking - grouped, tickable, printable and adjustable for length and season. Quotation Generator A full quotation document - parties, line items, discount, tax and total - with copy and print in one click. Purchase Order Generator A full PO document - buyer, supplier, ship-to, items, terms and totals - with copy and print. Receipt Generator A monospace thermal-style receipt with subtotal, tax, rounding and change, ready to copy or print.

Name Generators

Dragon Name Generator Western and Eastern dragon names, with optional epithets. Elven Name Generator Elven names with house names, constructed rather than borrowed. Dwarf Name Generator Dwarf given names and compound clan names. Viking Name Generator Real Old Norse names with correct patronymics and saga bynames. Demon Name Generator Invented demon names with optional titles, for fantasy and gaming. Medieval Name Generator Historical given names with the four real surname classes. Japanese Name Generator Real Japanese given names and common surnames, surname first. Horse Name Generator Racing registry names and informal stable names, kept separate. Arabic Name Generator Genuine Arabic names with the ibn and bint patronymic. Place Name Generator Place names from real English elements, with the suffixes explained. Human Name Generator Plain realistic names for test data and background characters. Band Name Generator Band names by genre, with the checks to run before committing. Artist Name Generator Artist and stage names by style, made in your browser - no AI wait, no signup, unlimited. Stage Name Generator Performer names, DJ names and mononyms, with the practical constraints. Song Name Generator Song titles by genre, including phrase-style titles. Villain Name Generator Villain aliases and titles, including understated mastermind names. Superhero Name Generator Original superhero names, with trademarked combinations provably blocked. Username Generator Usernames in four styles, with real platform limits listed. Gnome Name Generator Given name, clan name and nickname, in their proper slots. Island Name Generator Four settings, kept separate, with real geographic vocabulary. Ship Name Generator Cut at syllable boundaries, ranked by how well they read. House Name Generator Five settings, separate vocabularies, plus what the council will want. Baby Name Generator A baby name generator drawing from real, currently popular US and UK names - not invented syllables. First Name Generator A general-purpose first name generator spanning both classic, timeless names and current ones - not just a baby-naming tool. Business Name Generator A business name generator with three genuinely different styles, not one generic word-mashing formula. Brand Name Generator A brand name generator building short, pronounceable invented words - not real-word compounds like a business name generator. Domain Name Generator A domain name idea generator built from your keyword, with common prefixes, suffixes and extensions. Fantasy Name Generator One hub for every fantasy race on this site, so you don't need to know which dedicated page to visit first. Last Name Generator A last name generator drawing directly from official US Census Bureau surname frequency data. Character Name Generator One hub for every genre of character name on this site, so you don't need to know which dedicated page to visit first. D&D Name Generator A tabletop-focused name generator: pick a race, get a name, and optionally attach a heroic title or epithet. Dog Name Generator A dog name generator drawing from 100 real, currently popular dog names, not invented ones. Cat Name Generator A cat name generator blending currently trending names with classic, enduring favourites. Pet Name Generator A multi-species pet name generator, for whenever the pet isn't specifically a dog or a cat. Middle Name Generator A middle name generator drawing from the same broad, real-name pool as this site's first name generator - because a middle name IS a first name, just positioned differently. Fairy Name Generator A fairy name generator built from nature and whimsy-themed syllable fragments, with an optional epithet. Mermaid Name Generator A mermaid name generator built from ocean and water-themed syllable fragments. Robot Name Generator A robot name generator offering two genuinely different naming conventions real and fictional machines actually use. Alien Name Generator An alien name generator built from harder consonant clusters and an optional apostrophe, deliberately avoiding anything that reads as a human name. Pirate Name Generator A pirate name generator built on the real three-part structure of a classic pirate name: rank, given name, and epithet. Ninja Name Generator A stylized ninja name generator built from shadow, elemental and stealth-themed syllable fragments - explicitly stylized-fiction framing, avoiding the common mistake of implying a 'ninja name generator' has real-name accuracy it doesn't have. Wizard Name Generator A wizard name generator built from generic archetype syllable fragments - not a lookup of any specific published character's name. Warrior Name Generator A warrior name generator combining a strong given name with an optional fierce battle epithet. Angel Name Generator An angel name generator built on the actual linguistic pattern real angelic names share, not a random-sounding word generator. Royal Name Generator A royal name generator combining a title, a regal given name, and an optional epithet - the real structure historical monarchs are known by.

Random Generators

Random Animal Generator 322 real animals, filterable by taxonomic group and seeded. Random Emoji Generator 1,075 widely-supported emoji, filtered by category and seeded. Decision Maker Weighted random choice that shows each option’s true percentage. Headcanon Generator G-rated headcanon prompts, verified by combinatorics test. Random Food Generator Random real dishes, filtered by course. Superpower Generator Superpowers with drawbacks, plus an unusual set. Simile Generator Similes by tone, built on concrete images. Random Country Generator 235 countries and territories, each with its flag, filterable by continent. Random Word Generator for Songs Songwriting word prompts, weighted toward concrete nouns. Random Paragraph Generator Readable placeholder paragraphs in three registers. Random Trivia Generator Trivia facts by topic, chosen not to go stale. Random Shape Generator Named 2D shapes with side counts, exportable as SVG. Random Football Score Generator Football scores from a Poisson model, not uniform noise. Mnemonic Generator Builds an acrostic from your list, with the mapping shown. Random Phone Number Generator Test numbers from reserved ranges only - never a live number. Kiss Marry Kill Generator Kiss marry kill with your own names. No built-in list. Random Birthday Generator Correct age windows, real leap days, and a seed for reproducible fixtures. Lottery Number Generator Quick-pick lines drawn with real randomness, for the big lotteries and any custom game. Random Number Generator A batch random number generator with a genuine no-repeat option and CSV export. Random Word Generator A random word generator that lets you pick a specific part of speech, not just any word. Random Letter Generator A random letter generator with genuine vowel-only or consonant-only filtering, not just the full 26-letter alphabet every time. Random Sentence Generator A random sentence generator producing actual grammatical sentences, not just words strung together. Random Color Generator A random color generator showing hex, RGB and HSL for every color at once, with a genuine pastel mode. Random Password Generator A password generator offering both character passwords and word-based passphrases, with the actual math behind the strength shown, not just a color bar. Random Coin Flip A coin flip tool that also runs proper batches with a heads/tails tally, not just a single novelty flip. Random Dice Roller A dice roller covering the full tabletop polyhedral set, showing every individual die alongside the total. Random Team Generator A team generator using a real Fisher-Yates shuffle, splittable by number of teams or by team size. Random Picker Wheel A spinning picker wheel where the winner is chosen fairly first, then the spin animates to it - not the other way around. Random Question Generator A conversation-question generator with genuinely different question types, not one mixed pile labelled 'questions'. Random Date Generator A random date generator with a genuine weekdays-only filter and no-repeat batch mode, not just one uniform pick from any day. List Randomizer Shuffle any list into a fair random order, or draw N items. Password Phrase Generator Diceware-style passphrases from a bundled word list, with entropy shown as you adjust.

Text Tools

Phone Number Extractor Extract phone numbers from text, normalised to E.164 and deduplicated. Number Extractor Extract numbers from text and get the sum, count and average with them. Tiny Text Generator Small caps, superscript and subscript, with the missing letters explained. Upside Down Text Generator Flips text properly - rotates the letters and reverses the order. Gothic Text Generator Blackletter and bold fraktur as real Unicode, not an image. Italic Text Generator Italic and bold-italic as real Unicode, not an image or a font. Bold Text Generator Bold and sans-serif bold as real Unicode, not an image or a font. Cursive Text Generator Cursive and bold cursive as real Unicode, not a font or an image. Cursed Text Generator Zalgo text with separate above, through and below controls. Plain Text Converter Fixes smart quotes, dashes and invisible characters, and tells you what it found. Pig Latin Translator Encodes and decodes. Handles qu, y and contractions correctly. Morse Code Translator Morse both ways with audio, WPM control and Farnsworth timing. Curved Text Generator Curved text as real SVG - sharp at any size, still editable. Shakespearean Translator Shakespearean with thou/thee correct and verbs agreeing. Victorian English Translator Victorian formal register, with contractions expanded. Medieval Translator Medieval register: Germanic vocabulary, deliberately plain. Royal English Translator Court register with the royal we applied properly. Fancy English Translator Modern elevated register, no archaisms. Scottish Accent Generator Scottish phonetic respelling with correct -nae negation. Syllable Counter Per-line counts, pattern checking, and honesty about ambiguous words. Pangram Checker Missing letters named, perfect pangrams identified, non-English alphabets supported. Chinese Font Generator Lookalike characters and genuine fullwidth forms, clearly separated. 9 Letter Word Finder Enter nine letters and get every dictionary word you can build from them, longest first. 8 Letter Word Finder Enter eight letters and get every dictionary word you can build from them. Word Wheel Generator Generate a word wheel with a guaranteed long answer, and see every solution. Pixel Font Generator Type something and get it as pixel art - downloadable as a PNG or copyable as text art. Online Text Editor Type, count, find-and-replace and download - with autosave so a refresh never loses your work. Lorem Ipsum Generator Assembles fresh Lorem Ipsum from the traditional word list every time, instead of repeating the same fixed block. Fancy Text Generator Shows a curated set of the most popular fancy styles up front, with every other style one click away, instead of one style per page. Small Caps Generator A small caps generator that honestly discloses the two letters Unicode never encoded, instead of silently leaving them as regular lowercase. Strikethrough Text Generator A strikethrough generator that keeps the line continuous through spaces, not one that breaks at every word gap. Underline Text Generator An underline generator that keeps the line continuous through spaces, not one that breaks at every word gap. Bubble Text Generator A bubble text generator using real Unicode circled letters, not an image or a font effect. Backwards Text Generator Reverses character order only, keeping every letter's normal shape - a genuinely different effect from upside-down text. ASCII Art Generator Built by rasterizing the actual rendered text, so it supports any character your font can draw, not just a fixed hand-transcribed alphabet. Binary Code Translator Works at the UTF-8 byte level, so accented letters and emoji round-trip correctly instead of only plain ASCII. Hex Code Translator Works at the UTF-8 byte level, so accented letters and emoji round-trip correctly instead of only plain ASCII. Base64 Converter (Text) A text-focused Base64 converter, UTF-8 safe so accented letters and emoji round-trip correctly. Word Counter Shows reading time and speaking time alongside the word, sentence and paragraph counts, all from one shared count, so the numbers never quietly disagree with each other. Character Counter Tracks against real-world character limits (tweets, SMS, meta tags) as you type, not just a bare count. Text Case Converter Covers both human-prose cases and the 4 programming-identifier cases most case converters skip. Reading & Speaking Time Calculator An adjustable rate instead of one fixed 200wpm assumption, since a technical document or a rehearsed speech genuinely differs. Line & List Cleaner Applies the common list operations together in one pass, instead of five separate single-purpose tools. Text Cleaner Fixes the specific problems text picks up from Word, PDFs and web pages, applied together in one pass. Text Diff Checker Uses a real longest-common-subsequence diff algorithm, so it finds the smallest real set of changes instead of flagging everything after the first difference. Email Extractor Deduplicates case-insensitively, since Same@Example.com and same@example.com are the same mailbox everywhere. URL / Link Extractor One extractor with 5 modes, instead of five separate single-purpose link-extraction pages. IP Address Extractor Lists IPv4 and IPv6 addresses separately, since they're structurally different address formats, not two versions of the same thing. Hashtag & Mention Extractor Lists hashtags and mentions separately, since they answer different questions - what topics, versus who's tagged. Date & Time Extractor Recognizes several common written date formats at once, not just one rigid pattern. Postal / ZIP Code Extractor Matches each country's real format specifically, rather than one loose pattern that would also match things that aren't postal codes at all. Keyword Extractor Honestly a 'most repeated significant word' tool, not a claimed TF-IDF relevance engine that would need a document corpus this tool doesn't have. Color Code Extractor Shows a real color swatch next to every match, reusing the same parser as this site's color conversion tools - not just a bare list of matched strings. Number to Words Converter Digits to English words, with British or American style and an amount-of-money mode. Readability Score Checker Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI readability scores for any English text. Roman Numeral Converter Numbers to Roman numerals and back, with dates and a reference chart. Word Frequency Counter Rank the words in a text by how often they occur, with stop-word filtering and CSV export. Find and Replace Text Find and replace in pasted text, with case, whole word and regex options and a match count. HTML Table Generator Turn pasted spreadsheet cells or CSV into clean HTML table markup. Markdown Table Generator Turn pasted spreadsheet cells or CSV into a clean Markdown table. Text Repeater Repeat any text up to 10,000 times with the separator of your choice. Caesar Cipher Caesar cipher encoder and decoder with all 25 shifts shown for cracking. Leet Speak Translator Text to leet speak at three levels, with a reverse mode. NATO Phonetic Alphabet Converter Convert text to NATO phonetic alphabet words and back, with ICAO spellings. Palindrome Checker Check words, phrases and lists for palindromes, ignoring case and punctuation as you choose. ROT13 Translator ROT13 encoder and decoder with an optional ROT5 for digits. Anagram Solver Unscrambles letters into anagrams and shorter words. Blank Text Generator Copy blank, invisible characters for empty names and messages. Scrabble Word Finder Playable words from your rack, with blanks, scores and filters. Special Characters Picker Copy and paste arrows, math, currency, Greek and other symbols. Wordle Solver Five-letter words that fit your Wordle clues, ranked. Reading Progress Calculator Pages or words remaining and finish time across one or several sessions. Email Signature Extractor Name, title, company, phones, email and links read out as fields, disclaimers set apart.

Converters

Image Tools

Resize Image to Exact Size Exact dimensions, a KB target, or a platform preset. Nothing uploaded. Contact Sheet Maker A proof sheet of thumbnails from your own images, with filenames or numbers, downloaded as a single file. Signature Extractor Transparent signature PNGs with an adjustable threshold. Nothing uploaded. Low Quality Image Maker Generation loss, not one bad save. Nothing uploaded. Pixel Art Generator Area-averaged downscale, median-cut palettes, optional dithering. Normal Map Generator Both Y conventions, named, with a lit preview to check them. Paint by Numbers Generator A minimum area size, so the template is paintable rather than theoretical. Heart Locket GIF Maker Two photos, an engraving, and a real animated GIF - nothing uploaded. Emote Resizer Drop in an image and get every size the platform needs, resized in your browser. Stencil Maker A photo, logo or word converted to a black-and-white stencil you can print, cut or paint. Instagram Grid Maker Cut an image into a puzzle-feed grid - equal, center-cropped tiles you download and post in order. Tier List Maker Build an S-tier-to-D-tier ranking from text or images, fully customisable, exported with no watermark. Image Cropper Corrects EXIF orientation before you crop, so a sideways phone photo doesn't get cropped in the wrong direction. Image Compressor Automatically reduces dimensions when quality reduction alone can't reach your target, instead of just giving up. Rotate & Flip Image Corrects EXIF orientation before applying your rotation, so the two never compound into an unexpectedly wrong angle. Image Filter Editor Includes a real sharpen filter, built as its own pixel convolution since neither CSS nor canvas filters have a sharpen primitive. EXIF Metadata Viewer Reads directly from the file's raw bytes, so it works without ever uploading a photo that might contain your exact GPS location. EXIF Remover Edits the raw file bytes directly instead of re-encoding through canvas, so the image itself is never re-compressed or degraded. Image Color Picker Combines a precise eyedropper with an automatically extracted dominant-color palette from the same image. Image to Base64 Converter Reads the file's raw bytes directly, so JPEGs aren't silently re-compressed on their way to becoming a Base64 string. Background Remover Honestly scoped as chroma-key colour removal, not AI subject cutout - clearly disclosed as working well on solid backgrounds only, rather than oversold as a general-purpose background remover. Image Watermark Includes a genuinely tiled, diagonal repeat mode, not just a single corner stamp. Image Border & Frame Handles rounded corners correctly on both the frame and the photo inside it, not just the outer edge. Image Size Calculator A genuine calculator, not an image editor - no file upload needed, since this only works with dimensions and DPI. Image Format Converter Flattens transparency onto white automatically when converting to JPEG, instead of silently turning transparent areas solid black. JPG to PNG Converter A focused, single-purpose front end for exactly the JPG-to-PNG conversion, on the same engine as this site's general format converter. PNG to JPG Converter Flattens transparency onto white automatically, instead of silently turning transparent areas solid black. WebP to PNG Converter Preserves WebP's transparency correctly during conversion, since PNG supports the same alpha channel. PNG to WebP Converter Preserves PNG's transparency correctly, since WebP supports the same alpha channel. SVG to PNG Converter Renders the PNG at the SVG's own intrinsic width and height automatically, preserving transparency, rather than requiring you to guess dimensions yourself. HEIC to JPG Converter Loads the HEIC decoder only once you actually choose a file, so every other page on this site never downloads it. ICO Converter Builds a genuine multi-resolution ICO binary, hand-assembled per the actual ICO file specification, plus a complete favicon pack in one click - the Apple touch icon, Android/PWA manifest icons, the web manifest file, and a ready-to-paste HTML snippet, since a modern site needs far more than a single .ico file. GIF to PNG Converter Honestly captures only the first frame of an animated GIF, disclosed plainly rather than pretending to extract every frame. TIFF to JPG Converter Uses a hand-written TIFF decoder built specifically for this tool, since no browser can open a TIFF file natively. AVIF to JPG Converter Relies on the browser's own native AVIF decoder, which is genuinely well supported in current browsers, rather than a separate library. YouTube Thumbnail Resizer Center-crops to YouTube's required 16:9 shape before resizing, so nothing gets stretched or squashed the way a plain resize would. Instagram Post Size Covers all three of Instagram's actual feed-post shapes at their exact recommended pixel dimensions, not just a generic square crop. Screenshot Tool Choose the area with a crosshair, annotate it, then save, copy or share. Pen, arrows, text, highlight and blur. No upload. Add Text to Image Write text on a photo with font, colour, outline and position controls. AVIF to PNG Convert AVIF to PNG, keeping transparency - nothing uploaded. Blur Image Blur or pixelate parts of a photo - nothing uploaded. BMP to JPG Convert BMP bitmaps to compact JPGs in your browser. BMP to PNG Convert BMP to PNG losslessly in your browser. Circle Crop Image Crop a photo to a circle or rounded square, with a transparent PNG. Collage Maker Combine several photos into an even grid collage - nothing uploaded. Favicon Generator Complete favicon pack from one image: ICO, PNGs, touch icon, manifest and tags. GIF Maker Make an animated GIF from several pictures - nothing uploaded. GIF to JPG Convert a GIF to a still JPG in your browser. ICO to PNG Convert an ICO icon or favicon to PNG, keeping transparency. Image Splitter Split an image into a grid of equal pieces and download them as a ZIP. Image Upscaler Enlarge a picture 2-4× with resampling and sharpening - nothing uploaded. JPG to WebP Convert JPG images to WebP in your browser - nothing uploaded. Meme Generator Make a classic top-and-bottom-text meme from any picture - no watermark. Merge Images Join images in a row or a column into one picture - nothing cropped, nothing uploaded. Passport Photo Maker Crop to passport or visa size with a head guide and a print sheet - nothing uploaded. SVG to JPG Convert SVG to JPG in your browser - nothing uploaded. WebP to JPG Convert WebP images to JPG in your browser - nothing uploaded. Image to Text Converter (OCR) Extract text from images with OCR that runs in your browser - 7 languages, several images at once, nothing uploaded. Base64 to Image Converter Decode Base64 or a data URI into an image you can preview and download - nothing uploaded. Image to ASCII Art Converter Convert a picture to ASCII art with width, character set, contrast and invert controls. Photo to Sketch Converter Convert a photo to a pencil sketch with softness and darkness controls. Color Blindness Simulator See an image as people with protanopia, deuteranopia, tritanopia and achromatopsia see it. Round Image Corners Round the corners of an image with transparent PNG or WebP output. Online Drawing Pad Simple online paint canvas with brush, shapes, undo and PNG download. Image Comparison Slider Before and after slider to compare two images and save the result. Black and White Image Converter Grayscale, threshold and dithered black and white, with invert. Image Opacity Changer Change a picture's opacity or make one colour transparent. Pixelate Image Pixelate a whole picture or only the areas you draw. Sprite Sheet Generator Combine images into one sprite sheet PNG with a JSON atlas.

File Tools

Compress PPTX See where the size actually is, then compress. Nothing uploaded. Compress DOCX See where the size actually is, then compress. Nothing uploaded. Compress XLSX See where the size actually is, then compress. Nothing uploaded. DOCX to Text Converter Reads a .docx as what it actually is - a ZIP of XML files - and pulls the real paragraph text straight out of the document XML, rather than needing Word installed anywhere. PPTX to Text Converter Sorts slides in true numeric order, not alphabetical - so slide 2 comes before slide 10, the way a plain filename sort would otherwise get wrong. XLSX to CSV Converter Recovers each cell's real column position from the file's own internal cell references, rather than assuming every row has the same number of values in the same order - which correctly handles rows with gaps. XLSX to JSON Converter Defaults to an array of objects keyed by your header row - the shape almost everyone actually wants from 'spreadsheet to JSON' - with a toggle for a plain array of arrays instead. Markdown to DOCX Converter Builds an actual, genuine Word document file from scratch - the real Office Open XML structure a .docx needs - rather than a plain-text file with a .docx extension tacked on. ZIP File Creator Add any number of files of any type, review the list before building, and download one ZIP file - all built inside the page, so files never leave your device. ZIP File Viewer Lists every entry in a ZIP archive - files and folders - with sizes, and lets you download any single file straight out of the archive without extracting everything else. TAR File Extractor Reads the actual TAR header structure to list every file and folder, and automatically detects and decompresses a gzip-compressed .tar.gz before reading it. Gzip Compress & Decompress Uses the browser's own native gzip implementation rather than a bundled compression library, so compressing or decompressing happens with real, standard gzip - the exact format used by curl, gzip on the command line, and web servers' Content-Encoding. File Hash Generator (SHA-256, SHA-1) Computes real cryptographic digests of an entire file using the browser's native Web Crypto engine, plus a hand-written MD5 implementation for the one algorithm the browser doesn't provide - and instantly tells you if a pasted hash matches, instead of leaving you to compare two long strings by eye. File Type Checker Reads a file's actual leading bytes - its "magic number" - to identify what it really is, then compares that against the file's extension and browser-reported MIME type, both of which are just claims a renamed or mislabelled file can carry regardless of its real content. File Size Converter (Bytes, KB, MB, GB) Separates the binary convention (1024-based, KiB/MiB/GiB - what operating systems typically show) from the decimal convention (1000-based, KB/MB/GB - what storage manufacturers and network speeds use) explicitly, since the same number of bytes reads out differently under each. File Name Cleaner Works on a plain list of names, so you can clean up filenames before you even have the files, or without needing to upload them - accents are transliterated to their base letter, spaces are replaced consistently, and the file extension is cleaned separately so it isn't mangled. Batch File Renamer Previews every new name live as you adjust the rules, then packages the files under their new names into one ZIP to download - a browser page has no way to rename files sitting on your device directly. Folder Tree Generator Reads the real structure of a folder you choose (only names and paths, not file contents), or builds the same tree from a pasted list of paths when picking an actual folder isn't convenient - useful for documentation, READMEs, or planning a project layout. CSV to Excel Converter Convert CSV to an Excel .xlsx file, with the separator detected and leading zeros kept - nothing uploaded. JSON to Excel Converter Convert JSON to an Excel .xlsx file, with nested objects flattened into columns - nothing uploaded. File Joiner Join split file parts (.001, .002 ...) back into the original file - in your browser, nothing uploaded. File Splitter Split any file into numbered parts of a size you choose - in your browser, nothing uploaded.

Developer Tools

Base64 Encoder/Decoder A Base64 encoder and decoder that handles emoji and accented characters correctly, with a URL-safe mode. URL Encoder/Decoder A URL encoder/decoder with an explicit choice between escaping a single value and encoding a whole address. HTML Entity Encoder/Decoder Turn special characters into safe HTML entities, or decode entities back into readable text. JWT Decoder Read a JWT's header and payload without needing the signing secret, and see at a glance whether it has expired - and explicitly explains, rather than glossing over, why decoding is not verifying, a distinction many tools leave unsaid. UUID Generator A UUID generator built for bulk use - up to 1,000 at once, in either version-4 (fully random) or version-7 (time-ordered, increasingly the default choice for database primary keys) - plus a decoder that reads the version, variant, and embedded timestamp back out of any UUID you paste in. Hash Generator Every common hash of your text, side by side, with an honest note about which ones are safe to rely on. Number Base Converter A number base converter that stays exact even far beyond what a standard calculator can represent precisely. Regex Tester A regex tester that highlights every match in context and lists capture groups, positions and named groups. Unix Timestamp Converter A two-way Unix timestamp converter with ISO, UTC, local time and a plain-English relative label all at once. MIME Type / File Extension Lookup A two-way lookup between file extensions and their standard MIME types. User Agent Parser Break down any user agent string into browser, operating system, device type and rendering engine. IP Subnet Calculator An IPv4 subnet calculator that gets the /31 and /32 edge cases right, not just the common /24. HTML Formatter/Minifier An HTML formatter and minifier that leaves the content of pre, textarea, script and style tags untouched. CSS Formatter/Minifier A CSS formatter and minifier that indents nested rules (including media queries) and normalises property:value spacing. JavaScript Formatter/Minifier A JavaScript formatter and minifier that never touches the inside of a string, even one that contains // or /* characters. SQL Formatter/Minifier A SQL formatter that breaks a query onto readable lines by clause, without ever splitting a comma inside a function call. Color Converter A color format converter that reads hex, rgb() or hsl() and shows all three at once. Color Picker A visual color picker with hex/RGB/HSL output and a recently-used color history saved on your device. Color Contrast Checker A contrast checker against all four WCAG thresholds at once, with a live text preview at your actual colors. Color Palette Generator A palette generator using the standard, fixed colour-wheel harmony rules - not a randomised suggestion. Gradient Generator A visual linear/radial gradient builder with up to 5 color stops and instant, ready-to-paste CSS. CSS Snippet Generator Four common CSS snippets - box shadow, border radius, text shadow, rgba color - each with live sliders and a preview. JSON Formatter, Minifier & Validator Paste any JSON and instantly see it beautified, minified, or as a collapsible-free readable tree, with syntax errors reported by message and cause rather than just a red X. JSON to CSV Converter Handles the common case cleanly: a JSON array of flat objects becomes a CSV with a header row built from every key seen across all objects, and CSV converts back to an array of objects using the header row as field names. JSON to XML Converter Uses one clear, disclosed convention in both directions: a JSON key becomes an XML element, arrays repeat that element, and an object key starting with @ becomes an XML attribute instead - since JSON and XML don't map onto each other in only one correct way. JSON to YAML Converter A real YAML parser and dumper under the hood, not a regex substitution, so nested objects, arrays, strings needing quotes, and multi-document quirks are all handled the way an actual YAML processor would handle them. CSV Formatter & CSV to TSV Converter Parses your data with a real RFC-4180-aware parser - so quoted fields containing commas, quotes or line breaks are handled correctly - then re-serialises it cleanly with consistent line endings and only the quoting that's actually needed. CSV to XML Converter Uses the header row as column names by default, wraps every data row in a configurable row element, and sanitises column names that aren't valid XML element names rather than producing broken XML. CSV Column Extractor Reads the actual header row from your CSV and shows a checkbox for every column found, so you pick by name rather than guessing column numbers - and the remaining columns keep their original left-to-right order. CSV Duplicate Remover Compares the full row across every column - not just one key field - and keeps the first occurrence of each unique row, with optional case-insensitive and whitespace-trimmed matching for messy exports. CSV Sorter Lets you sort by any column found in your data, and choose whether to sort it as text or as numbers - so a numeric column sorts 2, 9, 10 in that order instead of the text-sort order of 10, 2, 9. XML Formatter & Minifier Uses the browser's own XML parser to understand real element nesting, attributes, comments and CDATA sections, rather than a regex or brace-matching approach that would get self-closing tags and attribute quoting wrong. XML to CSV Converter Scoped to the common repeated-row shape - one root element containing repeated row elements, each with simple child elements as columns - which is exactly what this site's own CSV-to-XML tool produces, and what most row-oriented XML exports look like. YAML Formatter Parses your YAML with a real YAML library and re-dumps it, which both validates the document and normalises its indentation and quoting in the same step - rather than trying to re-indent YAML text without understanding its structure. Cron Expression Generator Build and explain five-field cron expressions, with plain-English meaning and the next 10 run times. HTML to Markdown Converter Convert HTML to Markdown, with headings, links, lists, tables and code blocks preserved. Markdown to HTML Converter Convert Markdown to HTML with a live preview, tables, lists and code blocks. .htaccess Generator Generate an .htaccess file with HTTPS and www redirects, 301 redirects, gzip, caching and more. Text Encryption Tool Encrypt and decrypt text with AES-256-GCM and a password, entirely in your browser. CSV Splitter Split a large CSV into smaller files by row count or number of parts, with headers kept, in one ZIP. Merge CSV Files Combine several CSV files into one, with columns matched by header name and an optional source column. HTTP Status Code Lookup A searchable HTTP status code reference with meanings, fixes and CSV export. URL Parser Break a URL into parts and decoded query parameters, then copy as JSON or download CSV. ASCII Table Searchable ASCII table with decimal, hex, octal and binary values and control code names. JSON to TypeScript Converter Generate TypeScript interfaces from a JSON sample with optional keys and unions. PX to REM Converter Convert px to rem and back for any base font size, with a reference table. CSS Flexbox Generator CSS Flexbox generator with a live preview and copyable code. CSS Grid Generator CSS Grid generator with a live preview and copyable code. JavaScript Key Code Finder See event.key, event.code, keyCode and modifiers for any key you press. CSV Statistics Tool Count, sum, average, median, min and max per numeric column, straight from pasted CSV. SQL Query Generator Statement type, table, columns, joins and conditions in; clean SQL out, updated live. Regex Builder Pattern built from clickable parts, plain-English explanation, live match testing. HTML Table to CSV Every row extracted in order, merged cells honoured, header kept separate. Image URL Extractor Every img src and srcset found, alt text beside it, placeholders set apart. YouTube URL Parser Every URL format, the video ID, embed snippet and start-time links in one readout. Product CSV Cleaner Whitespace, price formats and case normalised; duplicate SKUs and missing prices flagged. Text to CSV Extractor Three input shapes recognised, separator detected, one row per record out. CIDR Range Converter Minimal CIDR lists from IPv4 ranges, and full network detail from a single CIDR. IP Address Converter Five representations of one IPv4 address, plus its class and whether it is private or reserved. IPv6 Address Formatter RFC 5952 formatting, strict validation and 128-bit prefix ranges, all in the browser. Text Legibility Checker WCAG-based verdicts on the five typography settings that decide whether body text is comfortable to read. SVG Shape Generator Circles, ellipses, rounded rectangles, polygons and stars as editable, handable SVG. CSS Animation Generator Fade, slide, zoom, pulse, spin, bounce or shake - written as CSS you can paste in. Responsive Breakpoint Generator Nine device widths as ready-to-paste media queries, with an optional fluid type scale.

Education & Math

Fraction Calculator Uses exact integer arithmetic throughout, so the simplified result is never off by a rounding error. Ratio Calculator Handles both things people actually need a ratio calculator for - simplifying, and solving a missing value - in one page. Mean, Median & Mode Calculator Reports every value tied for the mode, not just the first one it happens to find. Standard Deviation Calculator Keeps population and sample as an explicit toggle instead of silently picking one, since they're genuinely different numbers. Probability Calculator Keeps single-event, combined-event and at-least-one-success probability in three separate, clearly labeled sections, instead of one form that assumes which question you're asking. Permutations & Combinations Calculator Uses arbitrary-precision integers throughout, so the result stays exact well past where a calculator using regular numbers would silently lose precision or overflow. Prime Checker & Generator Uses a real trial-division test and a genuine Sieve of Eratosthenes, not a probabilistic shortcut, since a browser tool's realistic input range doesn't need one. Factors Calculator Computes both the full factor list and the prime factorization from one calculation, using a square-root shortcut instead of checking every number up to n. LCM & GCD Calculator Works for two or more numbers at once, not just a fixed pair. Factorial Calculator Uses arbitrary-precision integers, so the result stays exact past 18! - where an ordinary calculator starts silently rounding. Exponent Calculator Uses arbitrary-precision integers whenever the result should be a whole number, so it stays exact well past 2^53. Logarithm Calculator Handles any base through the change-of-base formula, not just the common presets. Linear Equation Solver Explicitly reports 'infinitely many solutions' and 'no solution' when they genuinely occur, instead of failing silently or dividing by zero. Quadratic Equation Solver Shows genuine complex roots when the discriminant is negative, instead of stopping at 'no real solution'. Math Worksheet Generator Prints the practice sheet and a separate answer key in one run, from a real name/date/score header, not a bare list of questions. Math Quiz Generator A graded, interactive quiz for self-testing - a genuinely different purpose from the printable math worksheet generator's offline practice sheet. Chemical Equation Balancer Balances chemical equations with an atom count check. Matrix Calculator Matrix operations up to 8 × 8: multiply, inverse, determinant, rank and more. Flashcard Maker One line per card - front, pipe, back - becomes a deck you flip on click and print two-sided. Quiz Generator Your own questions, numbered and laid out for printing, with the key on its own page. Worksheet Builder Title, subject, instructions and your questions, laid out as a clean sheet ready to print.

SEO Tools

SERP Preview Checker Measures actual rendered pixel width in the font Google uses, rather than a flat character-count rule that treats every letter as the same width. OG & Twitter Card Generator Shows a visual preview of the resulting share card alongside the generated tags, instead of leaving you to guess how it will actually look. Word Count Tool (SEO) Benchmarks your word count against typical ranges by content type, and adds a readability score - not just a raw count with nothing to compare it to. Keyword Density Checker Reports density for the specific keywords you name, rather than just showing whatever words happen to repeat most - a different job from a general keyword-frequency tool. Heading Structure Checker Reads the real heading elements out of your actual HTML rather than asking you to describe your structure, so it catches what's genuinely there - including headings a template silently duplicated or skipped. Image Alt Text Checker Flags generic, filename-like alt text like 'IMG_4471.jpg' as a real problem, not just images with no alt attribute at all. Link Extractor (HTML) Reads real <a> element attributes - rel, target, anchor text - out of actual HTML, which a plain-text URL scan has no way to see. Canonical URL Checker Compares the canonical tag against the page's own actual URL you provide, not just checking that a canonical tag exists at all. robots.txt Generator Treats AI crawlers as their own first-class toggle list, not an afterthought bolted onto a generic path-blocking form. XML Sitemap Generator Builds the sitemap from a URL list you already have, rather than crawling your domain - which means no server round-trip, no crawl limits, and it works for a site that isn't live yet. Schema Markup Generator Escapes the output so a literal '</script>' typed into any field can't break the very <script> tag this snippet is meant to be pasted into on your page. FAQ Schema Generator Locks straight into FAQ fields - the same generator behind this site's general Schema Markup Generator, without an extra type selector to click through first. UTM Builder Flags a space in any parameter before you ship the link, since it gets silently percent-encoded rather than rejected - a common cause of messy-looking analytics reports. SEO Slug Generator Strips accented characters using Unicode normalization rather than a hand-maintained lookup table, so titles in Spanish, French, Portuguese and more all convert correctly. Redirect Generator Built bulk-first - paste a whole migration's worth of old-to-new URL pairs at once, rather than a single-URL form you'd have to repeat for every redirect. Hreflang Tag Generator Generate hreflang tags for multilingual and multi-region pages, as HTML, sitemap XML or HTTP header. Meta Tag Generator Generate SEO and social meta tags with length checks, ready to paste in your page head. Robots.txt Tester Paste your robots.txt, add example URLs, and get the matching rule and verdict for each one. Meta Tag Audit Tool One pass over your HTML: title and description lengths, canonical, robots, Open Graph and Twitter tags. Internal Link Analyzer Internal links grouped per destination page, with anchor text quality flags in the same pass. Redirect Mapping Tool Old and new URL lists in, matched redirect map out, with unmapped URLs called out. UTM Parameter Analyzer UTM source, medium, campaign, content and term read out in one table, with hygiene warnings. Schema Markup Validator Parse errors, @type identification, missing required properties - each issue explained. OG Image Checker Exact pixels, aspect ratio and file size with pass or fail per platform, plus the live crop. Keyword Clustering Tool Related terms grouped into clusters, each named by its most common head term. Bulk URL Slug Generator Every title slugified at once: lowercase, accents converted, separator of your choice. Sitemap URL Formatter One consistent URL per page: scheme, www, slash, case and parameters normalised, duplicates gone. Sitemap XML Parser URLs, lastmod, changefreq and priority read out of any sitemap, indexes included.

PDF Tools

Merge PDF Lets you reorder files after adding them, not just merge in upload order - the difference between the order you happened to select files and the order you actually want in the final document. Split PDF Covers both 'cut this into equal pieces' and 'give me these exact page groups' as separate modes, instead of forcing one mechanism to awkwardly serve both. Rotate PDF Adds the rotation to each page's existing orientation rather than resetting it, so a scanned page that's already sideways turns further in the right direction instead of snapping back to upright first. Organize PDF Pages Handles reordering, deleting and extracting with the same simple keep-or-discard checkbox plus up/down buttons, since all three are really the same underlying operation. PDF Page Numbers Positions every number from that page's own actual dimensions, not a single coordinate assumed from the first page - so a document with mixed page sizes still gets correctly placed numbers throughout. PDF Crop Calculates each page's crop from that page's own actual size, not a single fixed measurement assumed from the first page - so a document with mixed page sizes still crops correctly throughout. Image to PDF Lets you reorder images after adding them, the same proven list-then-arrange approach as this site's Merge PDF tool, rather than forcing you to select files in exactly the right order upfront. PDF to Image Loads its PDF renderer (pdf.js, a genuinely large library since no browser can rasterize a PDF page any other way) only once a file is actually chosen, so every other page on this site never downloads it. PDF to Text Honestly detects and discloses when a PDF has little or no real text layer to extract, rather than silently returning an empty result with no explanation. PDF Metadata Viewer Reports every page's actual dimensions individually rather than assuming one size for the whole document, since a PDF can legally mix page sizes. PDF Watermark Draws the watermark as real vector text, not a rasterized overlay, so every page's underlying content stays exactly as sharp and selectable as it was. Add Text to PDF Renders a clickable preview so you place text by clicking exactly where you want it, rather than guessing coordinates - but the text itself is drawn onto your original PDF, never onto a flattened copy of the preview. PDF Markup Draws real vector ink directly onto the page content, and says plainly that it's permanent - not a removable PDF annotation object you could later toggle off or edit. PDF Signature Adds a genuinely drawn signature image, placed exactly where you click - and says plainly that it's a visual stamp, not a cryptographic signature, so you know exactly what protection it does and doesn't provide. PDF Form Filler Reads the PDF's actual AcroForm fields and builds the right input for each one - a checkbox for a checkbox, a dropdown for a dropdown - rather than a single generic text box for everything. PDF Grayscale Converter Says plainly, before you convert, that the result's text won't be selectable anymore - a genuine and unavoidable side effect of the only way to desaturate a PDF's existing content, not a limitation hidden until after downloading. PDF Password Protect Uses genuine AES-256 encryption, the current standard, and explains honestly when permission restrictions (like 'no printing') actually take effect versus when they're just cosmetic. Word to PDF Converter Rebuilds each paragraph as real, wrapped and paginated PDF text with its actual heading level and bold/italic formatting - not a screenshot of the page, and not plain unformatted text either. Compare PDF Compare the text of two PDFs and see what changed - nothing uploaded. Compress PDF Reduce PDF file size with two honest methods - nothing uploaded. Extract PDF Pages Pull selected pages out of a PDF into a new file - nothing uploaded. Flatten PDF Make filled PDF form fields permanent and uneditable - nothing uploaded. PDF to Word Recover a PDF’s text into an editable .docx - nothing uploaded. Redact PDF Permanently black out text in a PDF - the hidden text is removed, not covered. Remove PDF Pages Delete pages from a PDF by number or range - nothing uploaded. Repair PDF Repair a corrupted PDF by recovering its readable pages - nothing uploaded. Unlock PDF Remove a PDF password or its print/copy restrictions - nothing uploaded. Text to PDF Converter Turn plain text or a .txt file into a PDF with page size, font, margins and page numbers - nothing uploaded. OCR PDF Converter OCR for scanned PDFs: pick pages, language and resolution, read the text, copy or save it. PDF Pages per Sheet (N-up) Put several PDF pages on one sheet for handouts and paper saving. PDF Booklet Maker Reorders a PDF into booklet page order for duplex printing. PDF Table Extractor Table columns detected from the text layout on each page, exported row by row.

Audio & Video Tools

Calculators

Add Days to Date Calculator Date plus or minus years, months, weeks and days, with the weekday. Age Calculator Exact age in years, months and days, total days, and days to the next birthday. Amortization Calculator Amortization schedule plus the interest and time saved by paying extra. Break-Even Calculator Break-even point in units and revenue from fixed costs, price and variable cost. Business Days Calculator Working days between two dates, excluding weekends and your holidays. Compound Interest Calculator Compound interest with monthly deposits and your choice of compounding frequency. Concrete Calculator Concrete volume for a slab in m³, yd³ and ft³, with a waste allowance. Date Difference Calculator Days, weeks, months and years between two dates, with weekdays. Day of the Week Calculator Weekday, ISO week number, day of the year and quarter for any date. Discount Calculator Sale price, savings, stacked discounts and checkout tax. Electricity Cost Calculator Appliance running cost per day, month and year from watts and your tariff. Final Grade Calculator The score you need on the final to reach your target grade. Fuel Cost Calculator Trip fuel cost from distance, economy (mpg or L/100 km) and fuel price. GPA Calculator GPA on the 4.0 scale from letter grades and credits. Grade Calculator Weighted course grade from scores and weights, with weight still to come. Hourly to Salary Calculator Hourly rate to yearly, monthly, weekly and daily gross pay. Hours Calculator Hours between two times, less a break, over any number of days. Loan Calculator Monthly payment, total interest and a yearly breakdown for any fixed-rate loan. Mortgage Calculator Monthly mortgage payment with tax, insurance and total interest. Paint Calculator Litres of paint and number of tins for a room, from its size and coats. Percentage Calculator Percent of a number, percent of a total, and percentage change - with the working shown. Profit Margin Calculator Margin, markup and selling price from cost - with both shown side by side. Pythagorean Theorem Calculator Missing side of a right triangle, plus area, perimeter and angles. ROI Calculator Return on investment and annualised return in one step. Simple Interest Calculator Simple interest from principal, rate and time, with the working shown. Tip Calculator Tip, total and each person’s share, with optional rounding. VAT Calculator Add or remove VAT, GST and sales tax at any rate - net, tax and gross. Scientific Calculator A scientific calculator with brackets, trig, logs, powers, roots, factorials and history. Area Calculator Area of a rectangle, triangle, circle, trapezoid, parallelogram or ellipse, in many units. Auto Loan Calculator Monthly car payment with down payment, trade-in and sales tax - plus total interest and cost. CAGR Calculator The steady yearly growth rate between a starting and an ending value, with the formula shown. Circle Calculator Radius, diameter, circumference and area of a circle from any one of them. Commission Calculator Sales commission with a flat rate or a higher-rate tier above a threshold, plus base pay. Credit Card Payoff Calculator How long to pay off a credit card and what it costs in interest, or the payment needed to clear it by a date. Decimal to Fraction Calculator Convert a decimal to its simplest fraction or mixed number, with a denominator limit. Markup Calculator Price from cost and markup - or markup from cost and price - with margin shown beside it. Ohm's Law Calculator Volts, amps, ohms and watts - enter any two and get the other two. Overtime Pay Calculator Regular and overtime pay from your hourly rate, hours worked and overtime multiplier. Pace Calculator Running pace per km and mile from a distance and time, with 5K to marathon projections. Percent Error Calculator Percent error between a measured and an accepted value, with absolute and signed error. Rule of 72 Calculator Years to double your money at any return - the Rule of 72 estimate beside the exact answer. Savings Goal Calculator How much to save each month to reach a goal, allowing for interest and what you already have. Scientific Notation Converter Convert numbers to scientific, E and engineering notation and back, with significant figures. Speed Distance Time Calculator Find speed, distance or time from the other two, in any common unit, with km/h and mph. Square Footage Calculator Total square footage of several rooms, from length x width lines, in sq ft, m² and sq yd. Tile Calculator How many tiles and boxes you need for a floor or wall, with grout gap and waste included. Triangle Calculator Solve a triangle from three sides or two sides and an angle: angles, area, perimeter and type. Unit Price Calculator Compare up to three products by price per unit and see the best value and the saving. Volume Calculator Volume of a cube, box, cylinder, sphere, cone or pyramid in cubic units, litres and gallons. Week Number Calculator The ISO week number of any date, with the week's dates, day of the year and quarter. BMI Calculator Body mass index with the WHO category and healthy weight range, in metric or US units. BMR Calculator Estimate your basal metabolic rate with the Mifflin-St Jeor equation, in kcal and kJ. Body Fat Calculator Estimate body fat percentage from tape measurements using the US Navy method. Calorie Calculator Estimate daily calories for maintenance or a gentle loss or gain, from your age, size and activity. Due Date Calculator Estimated due date from your last period or conception, with weeks pregnant and trimester dates. One Rep Max Calculator Estimate your one-rep max from a set of reps, with Epley and Brzycki formulas and percentage weights. Ovulation Calculator Estimated ovulation day, fertile window and next period for the next three cycles. Target Heart Rate Calculator Maximum heart rate and five training zones from your age, with the Karvonen method. APR Calculator True loan APR from the payment, term and upfront fees. 50/30/20 Budget Calculator Split income into needs, wants and savings with the 50/30/20 rule. Car Lease Calculator Car lease payment from price, residual, term and money factor, with the APR equivalent. Debt Payoff Calculator Multi-debt payoff plan with snowball or avalanche and the interest saved. Dividend Calculator Estimate dividend income from yield, with optional growth and a yearly table. Down Payment Calculator Down payment amount, loan size and monthly payment for any home price. Future Value Calculator Future value of a lump sum with your choice of compounding frequency. House Affordability Calculator Estimate the house price you can afford from income, debts and down payment. Investment Calculator Investment growth with monthly contributions, with a year-by-year table. IRR Calculator Internal rate of return for any series of cash flows. NPV Calculator Net present value of a series of cash flows at your discount rate. Present Value Calculator Present value of a future amount at a discount rate, with the discount factor. Retirement Calculator Projected retirement savings against the pot needed for your income, in today's money. Stock Profit Calculator Profit or loss on a share trade with fees, return and break-even price. Battery Life Calculator Battery runtime from mAh, current draw and usable capacity. Confidence Interval Calculator Confidence interval and margin of error for a mean, using t or z. Correlation Calculator Pearson correlation, R squared and the regression line for paired data. Density Calculator Solve for density, mass or volume with g/cm³, kg/m³ and lb/ft³ shown. Half-Life Calculator Half-life decay: amount remaining, time to a target and the decay constant. Ideal Gas Law Calculator Solve the ideal gas law for pressure, volume, moles or temperature. LED Resistor Calculator Series resistor for an LED, with standard value and power rating. Long Division Calculator Quotient, remainder and repeating decimal for any whole-number division. Molar Mass Calculator Molar mass and percent composition from a chemical formula. Percentile Calculator Percentile, percentile rank and quartiles of a list of numbers. pH Calculator pH, pOH, hydrogen and hydroxide ion concentration from any one of them. Resistor Color Code Calculator 4- and 5-band resistor colour code reader with tolerance range. Sample Size Calculator Survey sample size from confidence level, margin of error and population. Significant Figures Calculator Count and round significant figures, with scientific notation. Slope Calculator Slope, line equation, distance and midpoint from two points. System of Equations Solver Solve 2×2 and 3×3 linear systems with Cramer's rule and a check. Z-Score Calculator Z-score and normal-distribution percentile from a value, mean and standard deviation. Board Foot Calculator Board feet and cost of lumber from thickness, width, length and quantity. Calories Burned Calculator Estimate calories burned in exercise from MET values, body weight and time. Cubic Yard Calculator Volume in cubic yards from length, width and height, in any common unit. Drywall Calculator Drywall sheets needed for a room, with ceiling, openings and waste. Flooring Calculator Boxes of flooring needed from room size, waste allowance and box coverage. Gravel Calculator Gravel needed in cubic yards, cubic metres, bags and weight. Ideal Weight Calculator Ideal body weight for your height from four published formulas, with the BMI range. Leap Year Calculator Check whether a year is a leap year, with the reason and the next leap year. Macro Calculator Grams of carbs, protein and fat from calories and a macro split. Mulch Calculator Mulch needed in cubic yards, cubic metres, bags and weight. Roof Pitch Calculator Roof pitch to angle, slope factor, rafter length and roof area. Arithmetic and Geometric Sequence Calculator nth term and sum of arithmetic and geometric sequences. Sleep Calculator Bedtimes and wake times counted in 90-minute sleep cycles. Square Root Calculator Square root, simplified radical form, perfect square check and cube root. Stair Calculator Stair rise and run: steps, riser height, total run, stringer length and angle. Time Calculator Add and subtract hours, minutes and seconds with a running total. Tire Size Calculator Tire diameter, sidewall and circumference, with a size comparison and speedometer effect. Topsoil Calculator Topsoil needed in cubic yards, cubic metres, bags and weight. Waist-to-Hip Ratio Calculator Waist-to-hip ratio with the WHO thresholds for men and women. PPI Calculator Pixel density, dot pitch and physical size from resolution and diagonal. ABV Calculator ABV from original and final gravity, with attenuation. APY Calculator APR to APY and APY to APR, with the interest on a deposit. Aspect Ratio Calculator Aspect ratio from width and height, with the matching new size. Binary Calculator Binary arithmetic and bitwise operations with decimal, hex and octal results. BTU Calculator Air conditioner BTU for a room, with sun, people and kitchen adjustments. Coffee Ratio Calculator Coffee-to-water ratio calculator in grams, with tablespoons and cups. Days Until Calculator Days, weeks and weekdays until or since any date. Deck Calculator Deck boards, joists and screws for a rectangular deck. Fence Calculator Fence posts, rails and pickets from length, spacing and gates. Golden Ratio Calculator Golden ratio parts from the longer part, shorter part or whole. Meeting Cost Calculator The cost of a meeting, a recurring meeting, and one fewer attendee. Moon Phase Calculator Moon phase, age and illumination for any date, with the next full and new moon. Mortgage Refinance Calculator Refinance payment change, break-even months and total interest saved. Net Worth Calculator Net worth from a list of assets and liabilities. Perimeter Calculator Perimeter and area of common shapes, including circles, polygons and ellipses. Pizza Dough Calculator Pizza dough ingredients in grams from baker's percentages. Pool Volume Calculator Pool volume in gallons and litres for rectangular, round and oval pools. Recipe Scaler Scale recipe ingredients, with fractions, to any number of servings. Wallpaper Calculator Rolls of wallpaper by whole drops, with pattern repeat. Zodiac Sign Calculator Western star sign, element, modality and Chinese zodiac animal from a birth date. Acceleration Calculator Constant acceleration from speeds, time or distance, in m/s² and g. Annuity Calculator Future value, present value and payment for regular payments. Binomial Distribution Calculator Exact and cumulative binomial probabilities with mean and standard deviation. Brick Calculator Number of bricks and mortar for a wall, with openings and waste. Cat Age Calculator Cat years to human years using the common 15, 9 and 4 rule. Day of the Year Calculator Day number of the year for any date, and back again. Decibel Calculator dB to ratio and back, adding sound levels and level at distance. Depreciation Calculator Straight line, declining balance and sum of the years' digits schedules. Dew Point Calculator Dew point, vapour pressure and absolute humidity from temperature and humidity. Dilution Calculator Stock volume, concentrations and final volume from C1V1 = C2V2. Dog Age Calculator Dog years to human years: the genetic formula, a size rule and times seven. Download Time Calculator Download or upload time from file size and connection speed. EV Charging Cost Calculator Cost per charge, range added and cost per mile against petrol. Freelance Rate Calculator Work out an hourly and day rate from the income you want to earn. Heat Index Calculator Heat index ("feels like") from temperature and humidity, with the NWS risk level. Kinetic Energy Calculator Kinetic energy, potential energy and speed of a fall. Molarity Calculator Molarity, mass and volume of a solution. MPG Calculator Fuel economy from distance and fuel, in US mpg, UK mpg and L/100 km. Parallel Resistor Calculator Equivalent resistance of resistors in parallel or series. Paver Calculator Pavers, base material and sand for a patio or path. Projectile Motion Calculator Range, time of flight and height of a projectile. Rounding Calculator Round to places, significant figures or a nearest multiple with five rounding rules. Stock Average Calculator Average cost per share across several purchases, with gain or loss. Surface Area Calculator Surface area and volume of cubes, boxes, spheres, cylinders, cones and pyramids. Wind Chill Calculator Wind chill ("feels like") from temperature and wind speed. Solar Panel System Size Calculator Solar system size in kW and panel count from monthly kWh, peak sun hours and derating. Electricity Bill Calculator Electricity bill estimate from consumption, tariff rates and fixed charges. Energy Consumption Calculator Appliance energy consumption in kWh and cost from wattage, quantity and hours of use. Watts to Amps Converter Current in amps from power in watts and voltage, for DC and AC single-phase circuits. Amps to Watts Converter Power in watts from current in amps and voltage, for DC and AC single-phase circuits. Solar Generation Calculator Solar generation estimate in kWh from system size, peak sun hours and system efficiency. Battery Backup Time Calculator Battery runtime in hours from voltage, amp-hour capacity, depth of discharge, inverter efficiency and load power. Car Fuel Consumption Calculator Fuel economy in MPG and L/100km from distance and fuel consumed, with cost per km and mile. Solar Savings Calculator Solar savings in dollars per year from system size, sun hours, electricity rate and bill offset, with payback estimate. Volts to Watts Calculator Power in watts from voltage and current, with power factor for AC circuits. Watts to Volts Calculator Voltage from power in watts and current in amps, with power factor for AC. kWh to Watts Converter Average power in watts from energy in kilowatt-hours and the time it was used over. Solar Battery Size Calculator Battery capacity in kWh and Ah from daily consumption, backup duration and depth of discharge. Solar Inverter Size Calculator Inverter capacity in watts and kVA from continuous load, motor surge and margin. Solar Payback Calculator Years to recover the cost of solar from the electricity it saves, after any incentives. Solar Panel Number Calculator Panel count and roof area from system size and individual panel wattage. Appliance Cost Calculator Running cost of one appliance per day, month and year from its wattage. Generator Fuel Cost Calculator Generator running cost per hour, per day and per run from fuel use and fuel price. Electricity Unit Price Calculator True cost per kWh from unit rate, standing charge, usage and bill total. kVA to kW Converter Real power in kW from apparent power in kVA and the power factor. kW to kVA Converter Apparent power in kVA from real power in kW and the power factor. Power Factor Calculator Power factor from real and apparent power, with a verdict and correction estimate. Wire Size Calculator Cable size in mm² and AWG from current, length, material and allowable voltage drop. Voltage Drop Calculator Voltage drop and power loss along a copper or aluminium cable. Car Average Calculator Average fuel economy in km/L, MPG and L/100km from distance and fuel, plus average speed. Fuel Required for Trip Litres or gallons needed for a journey from distance and fuel economy, with a reserve buffer. Fuel Price Comparison Calculator Compare fuel prices and see the cheapest option, the cost per fill-up and the yearly saving. Car Running Cost Calculator Total annual car running costs from fuel, insurance, maintenance and more, per month and per km. Cost per Kilometre Calculator Cost of driving each kilometre and mile from fuel and other expenses, divided by distance. Trip Expense Splitter Divides fuel, tolls, parking and other travel costs between passengers, equally or by share. EV Range Calculator Electric car range from usable battery capacity and energy consumption, in km and miles. Petrol vs Electric Car Calculator Compare annual petrol and electric running costs, savings and payback over a year. Car Depreciation Calculator Car value over time from purchase price and annual depreciation rate, straight-line or declining balance. Mileage Converter Converts fuel economy between km/L, L/100 km, UK MPG and US MPG, with a reference table. Fuel Injector Flow Calculator Fuel injector flow requirements from engine power, fuel type and duty cycle, in cc/min and lb/hr. Journey Time Calculator Travel time from distance and average speed, with arrival time and break time included. Brake Distance Calculator Stopping distance from speed, reaction time and road surface, split into reaction and braking. Roofing Calculator Roof area and shingle bundles from footprint, pitch and a waste allowance. Flooring Cost Calculator Material, installation and total flooring cost from area, price per unit and a waste allowance. Water Tank Calculator Tank capacity from dimensions for cylindrical and rectangular tanks, in litres, gallons and cubic metres. Room Heating Calculator Heating requirement in BTU, watts and kW from room volume, insulation quality and temperature difference. AC Size Calculator Cooling capacity in BTU, tons and kW from room area, ceiling height and heat-load factors. Water Usage Calculator Household water consumption by fixture, with daily, monthly and yearly totals and optional cost. Moving Cost Calculator Moving expenses from distance, volume and service rates, separated into transport, packing, labour and extras. Furniture Fit Calculator Fit check for furniture against doorways, corners and room dimensions, with the diagonal measurement. Salary Calculator Annual, monthly, weekly and hourly pay converted in one view, with working weeks and hours adjustable. Inflation Calculator Purchasing power of money over time, forward and backward, from an entered inflation rate. Inventory Turnover Calculator Inventory turnover ratio, days in inventory and restock cadence from cost of goods sold and average stock. Discount and Profit Calculator Discounted price, profit after the cut and the margin-safe floor price from cost, price and discount percentage. Loan Payoff Calculator Payoff date, total interest and savings from extra payments on any fixed-rate loan. CGPA Calculator CGPA from semester GPAs and credit hours, with percentage conversion and what the next semester needs. Attendance Calculator Attendance percentage from attended and total classes, with the missable-classes figure for a target. Exam Marks Calculator Required marks for a target percentage from obtained marks, maximum marks and remaining exams. Weighted Average Calculator Weighted mean from values and weights, with a marks mode and the simple average alongside. Statistics Calculator Descriptive statistics for a pasted dataset: centre, spread, quartiles and standard deviation. Work Hours Calculator Daily and weekly hours from shift times, with unpaid breaks and overtime against a threshold. Time Duration Calculator Add and subtract durations in hours, minutes and seconds, with the total in every unit. Water Intake Calculator Daily water intake estimate from body weight, activity level and climate, with every assumption explained. Amps to Milliamps Converter Amps to milliamps and back, with the decimal and scientific notation both shown. kWh to Joules Converter kWh to joules and back, with megajoules and watt-hours shown alongside. Watts to Horsepower Converter Watts to horsepower and back, using mechanical (745.7 W) and metric (735.5 W) definitions. Lumens to Watts Converter Lumens to watts and back by luminous efficacy, for LED, CFL and incandescent bulbs. BTU to Watts Converter BTU/hr to watts, kilowatts and amps, with familiar heater and AC sizes for context. AWG Wire Size Converter AWG to millimetres, inches and circular mils, straight from the standard gauge table. Percentage to Decimal Converter Percent to decimal and back, showing the fraction form and handling chained percentages. Image DPI Converter Print size from pixels and DPI, or the pixels a print size needs, in inches and centimetres. Pixels to Inches Converter Pixels to inches and back at any DPI, converting full dimensions in one pass. CSS Unit Converter All CSS units at once - px, rem, em, pt and percent - against a root font size you control. Plant Spacing Calculator Plants per row, rows and total plants from bed length, width and plant spacing. Seed Rate Calculator Seed needed in grams or pounds from the area, the rate and a germination buffer. Fertilizer Calculator Product rate and N-P-K breakdown from the area, the targets and the analysis. Irrigation Water Calculator Irrigation water in litres, cubic metres and gallons, plus runtime at your flow rate. Crop Yield Calculator Total harvest from the area and the yield, in tonnes, kilograms, bushels and bags. Recipe Cost Calculator Pack prices split down to the amount you actually use, summed into a recipe total and a cost per serving. Food Cost Calculator The percentage a dish costs, the profit it leaves, and the price needed for the target you set. Luggage Weight Calculator Bag by bag totals in kilograms or pounds, checked against the checked and cabin allowances you enter. Travel Budget Calculator Daily spending, transport and activities with a safety buffer, split across travellers and days. Print Cost Calculator Toner and paper cost per page, with totals for a whole print run in mono and colour. Paper GSM Calculator Grams per square metre from weight and area, and the reverse for a whole run of sheets. Banner Size Calculator Pixel dimensions, file size and viewing-distance text height for any printed banner. Depth of Field Calculator Hyperfocal distance, near and far focus limits and total depth of field for any lens setup. Exposure Value Calculator EV100 from f-number, shutter speed and ISO, with light conditions and equivalents. Shutter Speed Calculator Focal-length rule and motion-blur limits, plus the subject speed a shutter can hold. Running Split Calculator Even splits, negative splits and required pace for any race distance, in kilometres or miles. Cycling Gear Speed Calculator Gear inches, development and speed in km/h and mph from the gearing you actually ride. Touch Target Calculator Size conversions at 96 dpi plus pass or fail against the 24 px AA and 44 px AAA target sizes.

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