Free online chart and diagram tools

Build line, bar, bubble, pie, donut, scatter and radar charts that are drawn locally in the browser.

Create, preview and export Mermaid diagrams as SVG or PNG in the browser.

Embeds sentences with Qwen3 in the browser and plots them on a 2D scatterplot by meaning.

Draw graphs and run algorithms such as shortest path, adjacency matrix and spanning tree.

Build UML sequence diagrams by typing text notation or by dragging items on the canvas.

Free chart maker for bar, line and pie charts that works without signing in.

Interactive editor for drawing graphs from text edge lists, used for competitive programming problems.

Describe tables in DBML code and the page draws the relationship diagram and can emit SQL.

Online editor for Graphviz DOT code with live preview and choice of layout engine.

Plot GPS tracks, waypoints or addresses on customizable maps and elevation profiles.

Builds a word cloud from text or CSV with adjustable fonts and layout; saves SVG or PNG.

Renders a JSON Schema as a browsable tree.

Create line, bar, pie and radar charts from typed data or imported spreadsheets, with templates.

Enter comma-separated values to make a bar, line, pie, dot plot or histogram to print or save.

Make pie, bar, line, area and Venn charts, then download them or share a short URL.

HTML5 mind mapping app for building mind maps directly in the browser.

Draws mind maps from JSON, YAML or Markdown outlines and exports PNG, JPEG or PDF.

Cloud mind map canvas with FreeMind import and export and quick keyboard-driven editing.

Classroom-oriented tool for making bar, line, area, pie and XY graphs from entered values.

Playground for the Pikchr language that turns text descriptions into SVG technical drawings.

Online PlantUML editor producing class, sequence, activity and state diagrams from text.

Draw database diagrams by typing a simple table-definition text.

Shows a regular expression as a visual diagram you can edit directly.

Draws a railroad diagram of a regular expression so you can see how it parses.