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How to Use Mermaid Chart: Complete Guide (2026)
Learn how to use mermaid chart free online — no signup, no download. Follow our step-by-step guide below.
What is Mermaid Chart?
Create flowcharts, sequence diagrams, Gantt charts, and more using Mermaid syntax. Live preview updates as you type. Export to SVG or PNG. Perfect for documentation, architecture diagrams, and process flows. No account required.
- 100% browser-based — no data uploaded to servers
- Free to use — no signup required
- Instant results — no waiting
- Works on all devices — mobile, tablet, desktop
How to Use Mermaid Chart: Step-by-Step
- 1
Write Mermaid syntax
Type Mermaid diagram code in the editor (e.g., graph TD; A-->B;).
- 2
Preview live
The diagram updates in real-time as you type. Errors are highlighted.
- 3
Export
Download as SVG (vector) or PNG (raster) for use in documents and presentations.
Common Use Cases
Documentation diagrams
Add flowcharts and sequence diagrams to Markdown documentation (GitHub supports Mermaid!).
Architecture visualization
Diagram system architecture, API flows, and database relationships.
Project planning
Create Gantt charts for project timelines and milestone tracking.
FAQ About Mermaid Chart
Does GitHub support Mermaid?
Yes! GitHub Flavored Markdown supports Mermaid diagrams. You can paste Mermaid code directly into .md files.
What diagram types are supported?
Flowchart, sequence diagram, class diagram, Gantt, pie chart, gitgraph, and more.
Can I collaborate with others?
Share the Mermaid code. Others can paste it into their own Mermaid editor to view and edit.
Ready to Try Mermaid Chart?
No signup. No download. 100% free.