Supported Diagram Types
| Diagram Type | Starts With | Common Use |
|---|
| Flowchart | flowchart TD | Processes, decisions, logic flow |
| Sequence | sequenceDiagram | Interactions between actors/systems |
| Class | classDiagram | OOP structure, relationships |
| State | stateDiagram-v2 | State machines, transitions |
| ER Diagram | erDiagram | Database entity relationships |
| Gantt | gantt | Project timelines and schedules |
| Pie Chart | pie | Proportional data |
| Mindmap | mindmap | Hierarchical ideas/notes |
Free Mermaid Live Editor
The Mermaid Live Editor is a free browser-based tool that lets you write
Mermaid Markdown and instantly generate professional diagrams with a live preview.
Whether you're documenting software architecture, planning workflows, creating UML diagrams,
or preparing technical documentation, this editor provides everything you need in one place.
Your Mermaid code is rendered in real time as you type, making it easy to experiment,
debug syntax, and build complex diagrams without installing any software.
Everything runs locally in your browser, keeping your work fast and private.
Supported Diagram Types
Create a wide variety of diagrams using Mermaid syntax, including:
- Flowcharts
- Sequence Diagrams
- Class Diagrams
- State Diagrams
- Entity Relationship (ER) Diagrams
- Gantt Charts
- Pie Charts
- Mind Maps
- Journey Diagrams
- Git Graphs
- User Journey Maps
- Requirement Diagrams
Key Features
- Instant live preview while editing.
- Supports multiple Mermaid diagram types.
- Syntax highlighting and easy editing.
- Copy Mermaid source with one click.
- Download diagrams as SVG.
- Export diagrams as PNG.
- Dark and light preview themes.
- Runs entirely inside your browser.
- No account or registration required.
- Works on desktop, tablet, and mobile devices.
How to Use the Mermaid Live Editor
- Choose a diagram template or start from scratch.
- Write or paste your Mermaid Markdown.
- Watch the live preview update automatically.
- Fix any syntax errors if needed.
- Copy the Mermaid code.
- Download the generated diagram as SVG or PNG.
Why Use Mermaid?
Mermaid allows developers, engineers, analysts, and technical writers to create diagrams
using simple text instead of drawing shapes manually. Since diagrams are stored as plain text,
they work well with Git, Markdown documentation, documentation generators, and CI/CD workflows.
Who Can Use This Tool?
- Software Developers
- Backend Engineers
- Frontend Developers
- DevOps Engineers
- Cloud Architects
- Technical Writers
- System Designers
- Business Analysts
- Students
- Teachers and Trainers
- Project Managers
Common Use Cases
- Software architecture documentation.
- API request and response flow diagrams.
- Database ER diagrams.
- Application state machines.
- Project timelines using Gantt charts.
- Git workflow visualization.
- Technical documentation in Markdown.
- Planning system workflows.
- Knowledge mapping with mind maps.
- Business process documentation.
Why Use This Mermaid Live Editor?
- 100% free to use.
- No installation required.
- Instant diagram rendering.
- Export high-quality SVG and PNG files.
- Supports modern Mermaid syntax.
- Fast and responsive interface.
- Works completely offline after loading.
- Your Mermaid code stays in your browser.
Start Creating Mermaid Diagrams
Write Mermaid Markdown, preview diagrams instantly, and export professional-quality
flowcharts, sequence diagrams, ER diagrams, Gantt charts, class diagrams, and more—
all from your browser with this fast, free Mermaid Live Editor.
Frequently Asked Questions
Is this tool free?
Yes, completely free with no signup. Everything runs client-side in your browser — nothing is sent to a server.
What is Mermaid syntax?
Mermaid is a markdown-inspired scripting language for generating diagrams and charts from plain text, so you can describe a diagram instead of drawing it manually.
Why do I see an error under the editor?
The error box shows Mermaid's own parser message, which usually points to the exact line or character where the syntax is invalid.
Can I export my diagram?
Yes — use "Download SVG" for a scalable vector file, or "Download PNG" for a raster image you can drop straight into docs or slides.