mermid
Self-hosted · MIT licensed

A diagram editor
for Mermaid.

Write Mermaid markdown, preview your diagrams instantly, and export to SVG, PNG, PDF, JPEG, or WEBP. No account, no AI, no nonsense.

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diagram.mermaid
graph TD
A[Specs] --> B{Review}
B -->|Approved| C[Develop]
B -->|Changes| D[Revise]
D --> B
C --> E[QA]
E --> F{Pass?}
F -->|Yes| G[Deploy]
F -->|No| C
Export formats
SVG, PNG, PDF, JPEG, WEBP — copy or download with one click.
Multiple tabs
Work on several diagrams at once. Rename, reorder, close.
Custom themes
Full control over colors, fonts, curves, and padding.
Templates
Start from a library of flowcharts, UML, ERDs, and more.