MermaidViewer

MermaidViewer

Free Mermaid editor & viewer with an AI diagram generator

MermaidViewer is a fast, free Mermaid diagram editor that runs in your browser. Paste code for an instant live preview, or describe a diagram in plain English and let AI write the Mermaid for you. It supports all 22+ diagram types, fixes syntax errors in one click, and exports PNG with no sign-up.

Productivity · Development Tools · Artificial Intelligence

Features

AI generates, edits, fixes and explains Mermaid diagrams

Live preview with line-specific error messages

All 22+ Mermaid diagram types, 30+ templates

Share links and live iframe embeds

PNG export without an account

Use Cases

Documenting software architecture and flows in READMEs

Turning meeting notes into flowcharts with AI

Fixing broken Mermaid code from docs or LLM output

Red Leaf Research Labs

Buy research peptides in Canada with verified lab reports

Comments

askdr-contact

Hi Fazier! I built MermaidViewer because I kept bouncing between docs and the Mermaid live editor just to check a diagram rendered. It gives an instant preview, line-specific errors, and an AI that turns plain English into Mermaid. Free to use with no sign-up. Feedback very welcome!

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