Mermaid Live Editor

mermaid.live

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Write flowcharts, sequence diagrams, and ER diagrams in plain text and see them render live — exportable as SVG or PNG.

Why it is useful

Diagrams-as-text means they can live in version control and get reviewed like code instead of being an unmaintained image file. This editor is the fastest way to iterate on Mermaid syntax before dropping it into docs or a README.