Free online chart and diagram tools

5 tools

Diagram editors, flowchart and sequence-diagram generators, chart builders, mind maps and whiteboards. Check the export formats (SVG, PNG, source text) before you invest time, since they decide whether a diagram can leave the tool.

Showing 1–5 of 5

0.869score
drawDB
drawDB
Design database schemas visually, then export SQL for PostgreSQL, MySQL, SQLite and others.
ArtifactNo sign-upIn-browser★ 40.2Kvisualization
0.763score
SQL to ER Diagram
Royal Bhati
Draws an entity-relationship diagram from pasted CREATE TABLE statements, locally in the page.
ArtifactNo sign-upIn-browser★ 714visualization
0.577score
Qwen3 Embedding Scatterplot
webml-community
Embeds sentences with Qwen3 in the browser and plots them on a 2D scatterplot by meaning.
ArtifactAINo sign-upIn-browser★ 42visualization
0.478score
Graphviz DOT Renderer
Simon Willison
Renders DOT graph source as SVG as you type and stores the graph in the URL fragment for sharing.
ArtifactNo sign-upIn-browservisualization
0.478score
Pandas Bar Chart in Pyodide
Simon Willison
Runs pandas, numpy and matplotlib in the browser via Pyodide to draw a bar chart.
ArtifactNo sign-upIn-browservisualization