Chart and Diagram Makers

Build a chart from your own data, read the result, and export it as SVG or PNG. Every chart here renders in your browser - your data is never uploaded, and there is no account to create.

27 tools
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.

About these tools

Education-first. Each chart explains how to read it, not just how to draw it.

Every tool in this category runs entirely in your browser. Nothing you type, paste or upload is transmitted to a server, and none of them require an account. That is a consequence of how they are built rather than a policy: there is no server involved in the calculation at all.

Each tool page explains the method behind it - the formula, the convention, or the reference table - and states plainly where the result is an estimate rather than an exact answer.