Render mermaid diagrams from your markdown, instantly
Paste any markdown containing ```mermaid code blocks — flowcharts, sequence diagrams, gantt charts, pie charts, mindmaps and more render as real diagrams, right inside beautifully typeset reading. Free, no account.
Free, no signup. Everything runs in your browser.
- All common mermaid types: flowchart, sequence, class, state, ER, gantt, pie, mindmap, timeline, quadrant, XY charts
- Click any diagram to enlarge it in a full-screen lightbox
- Diagrams follow your light/dark theme automatically
- Broken diagram syntax degrades gracefully — the rest of the document still renders
- Diagrams are included in PDF and EPUB exports (Pro)
- Everything renders locally in your browser — nothing is uploaded
How it works
- 1
Paste markdown with mermaid blocks
Any document that uses ```mermaid fences works as-is — the same syntax GitHub and Obsidian use. No conversion needed.
- 2
Diagrams render automatically
Each fence becomes a real SVG diagram, themed to match your reading colors, alongside properly typeset text, tables, math, and code.
- 3
Click to enlarge
Any diagram opens in a full-screen lightbox for detailed reading — press Escape or click outside to close.
Frequently asked questions
Which mermaid diagram types are supported?
Everything mermaid v11 renders: flowcharts, sequence diagrams, class diagrams, state diagrams, entity-relationship diagrams, gantt charts, pie charts, mindmaps, timelines, quadrant charts, and XY bar/line charts.
Do I need to change my markdown?
No. Standard ```mermaid code fences — the same syntax used by GitHub, GitLab, and Obsidian — render automatically.
Is my diagram data uploaded anywhere?
No. Rendering happens entirely in your browser with the mermaid library. Magzdown has no backend and stores nothing on servers.
What happens if a diagram has a syntax error?
That block shows the source with an error message; the rest of your document renders normally.
Ready to read?
Paste markdown, drop a .md file, or fetch a URL — Magzdown renders it instantly, privately, in your browser.
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