Privacy Policy

Last updated: June 13, 2026

Diagramgen is built to collect as little data as possible. There is no account, no signup, and your diagram text is never uploaded.

Your diagrams never leave your device

All diagrams are rendered locally in your browser using Mermaid.js. The text you type — and the diagram it produces — is processed on your own device and is never transmitted to us or any third party. Once the rendering engine has loaded, the conversion and export happen entirely on your machine.

No account, no file storage

We do not ask for an email or create an account. Because nothing is uploaded, we never store, see, or have access to your diagrams or their source.

Analytics

We use a lightweight, cookieless analytics script that records anonymous, aggregated events — such as which page was used and whether a diagram rendered successfully. It sets no persistent identifiers and collects no personal information, so this site shows no cookie banner. We run no advertising trackers.

The rendering engine

The first time you render a diagram, your browser downloads the open-source Mermaid.js engine from a public CDN and caches it for next time. That is code coming to you — your diagram text never goes the other way.

Outbound links

Some pages link to related free tools we operate. Those links carry a simple source tag so we understand traffic between our own sites; they contain no personal data.

Contact

Questions? Email support@diagramgen.app.