Mermaid Live Editor
Validate & render Mermaid diagrams
Source Input
Processed Output
What is the Mermaid Live Editor?
Mermaid lets you write diagrams as text — flowcharts, sequence diagrams, ER models — that render in GitHub and docs sites. This editor checks your syntax for common errors (missing arrows, unterminated nodes), explains the diagram type and nodes it detects, and gives you a one-click live-render link.
Frequently Asked Questions (FAQ)
Q: Where can I render Mermaid?
GitHub, GitLab, Notion, and mermaid.live all render it natively. The generated link opens your exact diagram live.
How to Use the Mermaid Live Editor
- 1Paste your input into the editor above — or start from the preloaded example.
- 2Adjust any options, then click Run to process instantly in your browser.
- 3Review the output panel, then copy, download, or save it as a reusable snippet.