About Mermaid Preview
Mermaid Preview is a free browser-based editor for writing, previewing, sharing, and exporting Mermaid diagrams without setting up a local toolchain.
The project is built for developers, product managers, solution architects, technical writers, and students who prefer diagrams that can live next to source code. Instead of manually dragging boxes around a canvas, you write Mermaid syntax and immediately see the rendered diagram.
Privacy-first design: Mermaid Preview renders diagrams in your browser. The diagram text you type is not uploaded to a Mermaid Preview application server for rendering.
Why This Site Exists
Mermaid is excellent for documentation because diagrams are plain text. They can be reviewed in pull requests, copied into Markdown files, stored in Git, and updated alongside the systems they describe. Mermaid Preview gives teams a focused place to draft those diagrams before committing them to documentation.
What You Can Create
- Flowcharts for user journeys, business logic, and decision trees.
- Sequence diagrams for API calls, authentication, retries, and asynchronous workflows.
- Class diagrams, ER diagrams, state diagrams, and Gantt charts.
- Exportable SVG and PNG assets for documentation, tickets, and presentations.
Editorial Approach
The tutorials and examples on this site are written around practical documentation tasks: explaining systems, reducing ambiguity, and giving readers copy-pasteable Mermaid snippets they can adapt. When an article compares tools or syntax choices, the goal is to help readers choose a workflow, not to publish generic keyword pages.
How Mermaid Preview Handles Content
The editor is designed as a drafting surface. You can write a diagram, preview the rendered result, export an image, or copy the source into your own documentation system. Public pages on this website provide tutorials and examples; they are not a repository for user-submitted private diagrams.
What Makes a Good Mermaid Tutorial?
A useful tutorial should include context, a copyable snippet, an explanation of why the syntax works, and notes about common mistakes. That is the standard used for new Mermaid Preview articles and examples. Thin articles that only define a term are not enough for readers who are trying to finish real documentation work.
Contact
Questions, bug reports, and content corrections are welcome. Use the contact page or email contact@mermaidpreview.com.