An ad-light, privacy-first diagram toolkit
Your diagrams are rendered locally in your browser and never uploaded.
Ads are minimal — and never see your diagrams
The free tier of Diagram Tools shows at most a single ad unit, placed below the fold on the home page and below the tool/output area on tool pages. There are no ads here, on /about, or on /unlock. Ads never see your diagram source and never interrupt an export — the same strict connect-src 'self' Content-Security-Policy that keeps every diagram on-device applies everywhere.
A fully ad-free Pro tier is coming
A future Diagram Tools Pro tier will remove ads entirely and add batch exports, high-resolution PNG themes, theme packs, and saved presets — all still 100% client-side, with no upload. It is not available yet.
Every tool works fully and free today, with no key required.