> mermaid | diagram | render <
// Paste Mermaid code, see a live SVG preview, download SVG or PNG
Instant Rendering
See your Mermaid diagram render as you type. Auto-updates after every change, no Render-button hunting required.
SVG & PNG Download
Download as vector SVG for crisp documentation, or as PNG for slides, Notion, Slack and anywhere else.
100% Client-Side
Your diagram code never leaves your browser. Everything runs locally — perfect for proprietary architecture sketches.
// ABOUT MERMAID
What Mermaid is:
Mermaid is a JavaScript-based diagram-as-code tool. You describe diagrams in a simple text syntax and Mermaid renders them as SVG. GitHub, GitLab, Notion, Obsidian and most modern docs platforms render Mermaid blocks natively in markdown.
Example:
flowchart TD; A[Start] --> B{OK?}; B -->|Yes| C[Done]
Need more power? Try mermaideditor.com — a full Mermaid editor with saved diagrams, sharing, and templates.
Common Use Cases:
- >Quick visual check of a Mermaid block from a README PR
- >Architecture, ERD and sequence diagrams in markdown docs
- >Sprint planning Gantt charts and state machines
- >Exporting clean SVG / PNG for slides and design specs
- >Learning Mermaid syntax with built-in examples
>> frequently asked questions
Q: What is Mermaid?
A: Mermaid is an open-source diagramming and charting tool that turns plain-text definitions into SVG diagrams. It supports flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, mindmaps, and more.
Q: Which diagram types does this tool support?
A: This renderer uses the official Mermaid library, so it supports every diagram type Mermaid supports — including flowchart, sequenceDiagram, classDiagram, stateDiagram, erDiagram, gantt, pie, journey, gitGraph, mindmap, and more.
Q: Is my diagram code uploaded anywhere?
A: No. All rendering happens in your browser using the Mermaid library. Your source never leaves your machine, which makes it safe for confidential architecture sketches.
Q: SVG vs PNG — which should I download?
A: SVG is a vector format — it stays crisp at any zoom level, edits in design tools, and is ideal for docs sites and GitHub. PNG is a raster format — easier to paste into Slack, Notion, Google Slides, and tools that do not accept SVG.
Q: How do I embed Mermaid in markdown?
A: Use a fenced code block with the mermaid language tag. GitHub, GitLab, Notion, Obsidian and most modern markdown renderers display the diagram automatically. For sites that do not support Mermaid natively, export your diagram as SVG or PNG and embed the image.
Q: I need saving, sharing, templates and themes — where do I go?
A: Try mermaideditor.com — a full-featured Mermaid editor with saved diagrams, share links, and a template gallery.