At a glance
| Feature | MermaidViewer | Mermaid Live Editor |
|---|---|---|
| Live preview, all diagram types | Yes | Yes |
| Works without sign-up | Yes | Yes |
| AI generate / edit / fix / explain | Yes (free daily quota) | No (links to Mermaid Chart) |
| Syntax highlighting & autocomplete | Yes | Yes |
| Saved diagrams in the cloud | Yes, with folders & tags | Browser history only |
| Version history | Yes | Local history |
| Public share links & embeds | Yes | URL sharing |
| Export PNG / SVG / PDF | All three, with scale & background | PNG, SVG |
| Pan, zoom, full-screen | Yes | Yes |
| Templates gallery | 30+ templates | Samples per type |
When mermaid.live is enough
If you only need a quick scratchpad to test syntax and copy an SVG, mermaid.live is perfectly fine — and it's open source. It's also the reference implementation, so it always tracks the latest Mermaid release.
When you'll prefer MermaidViewer
- You want to describe a diagram in plain English and get Mermaid code back.
- You need to fix syntax errors quickly — AI Fix uses the parser error to repair code.
- You keep many diagrams and want folders, tags, search and version history.
- You want to embed live diagrams in docs, Notion or Confluence and update them in one place.
- You need PDF export or high-resolution PNGs with transparent backgrounds.
Switching is instant
Paste your existing code into the MermaidViewer editor — the syntax is identical because both run the official Mermaid library.
Frequently asked questions
Is MermaidViewer compatible with mermaid.live diagrams?
Yes. Both use the official Mermaid library, so any diagram that renders in mermaid.live renders in MermaidViewer.
Is MermaidViewer free?
Yes. The editor, exports and sharing are free without an account. A free account adds cloud saving; Pro adds higher AI limits and unlimited diagrams.