Mermaid Chart Editor

Professional flowchart, sequence diagram, Gantt chart and other chart drawing tool with real-time preview and export features

Code Editor

Real-time Mermaid code editing with instant preview

Chart Preview
80%

Supported Chart Types

Flowchart Diagrams

Create decision flowcharts, process flows, and workflow diagrams using graph or flowchart syntax. Perfect for algorithm visualization, business process mapping, and system logic documentation.

Algorithm design, business workflows, decision trees, process documentation

Sequence Diagrams

Visualize object interactions over time with sequence diagrams. Essential for API documentation, system design, and understanding communication patterns between components.

API documentation, system interactions, message flows, protocol design

Gantt Charts

Build project timelines and track milestones with Gantt charts. Ideal for project management, sprint planning, and resource allocation visualization.

Project planning, sprint timelines, milestone tracking, resource management

UML Class Diagrams

Design object-oriented systems with UML class diagrams. Show relationships, inheritance, and dependencies between classes in software architecture.

Software architecture, OOP design, database modeling, system documentation

State Diagrams

Model system states and transitions with state diagrams. Perfect for finite state machines, UI states, and system behavior documentation.

State machines, UI flow, system states, game development

Entity Relationship (ER) Diagrams

Design database schemas and data relationships with ER diagrams. Essential for database design, data modeling, and system integration planning.

Database design, data modeling, system integration, schema documentation

Pie Charts

Visualize data proportions and percentages with pie charts. Great for showing market share, survey results, and statistical data representation.

Data visualization, survey results, market analysis, statistical reports

User Journey Maps

Map customer experiences and user interactions with journey diagrams. Essential for UX design, customer experience optimization, and service design.

UX design, customer experience, service design, user research

What is Mermaid Diagram Generator?

Mermaid is a powerful JavaScript-based diagramming and charting tool that renders Markdown-inspired text definitions to create and modify diagrams dynamically. Our online Mermaid editor provides a user-friendly interface for creating professional diagrams without requiring specialized software installation.

Text-based diagram creation using simple syntax
Real-time preview with instant feedback
Multiple chart types support (flowchart, sequence, Gantt, class diagrams)
Export to SVG and PNG formats for presentations
Version control friendly - diagrams as code
Browser-based tool - no software installation required

When to Use Mermaid Diagram Tool

Perfect for developers, project managers, business analysts, and technical writers

Software Documentation

Create flowcharts for code logic, system architecture diagrams, and API workflows for technical documentation

software architecture diagrams, code flow visualization, API documentation charts

Project Management

Build Gantt charts for project timelines, milestone tracking, and resource planning in agile and waterfall methodologies

project timeline visualization, Gantt chart creation, milestone tracking diagrams

Business Process Mapping

Design process flowcharts, decision trees, and workflow diagrams for business analysis and process optimization

business process flowcharts, workflow visualization, decision tree diagrams

Database Design

Create entity relationship diagrams (ERD) for database schema design, data modeling, and system integration planning

database ER diagrams, data model visualization, schema design charts

System Design Interviews

Quickly sketch system architecture, data flow diagrams, and component interactions during technical interviews

system design diagrams, technical interview charts, architecture visualization

User Experience Design

Map user journeys, create user flow diagrams, and visualize customer experience touchpoints

user journey mapping, UX flow diagrams, customer experience visualization

Why Choose Our Mermaid Diagram Editor?

Professional diagram creation made simple

Real-time Live Preview

See your diagrams render instantly as you type, with immediate syntax error detection and correction suggestions

Multiple Export Formats

Download diagrams as high-quality SVG vectors or PNG images, perfect for presentations, documentation, and web use

Syntax Error Detection

Built-in validation highlights syntax errors with clear error messages, making diagram creation error-free

Template Gallery

Start quickly with pre-built examples for flowcharts, sequence diagrams, Gantt charts, and class diagrams

Version Control Friendly

Text-based diagrams integrate perfectly with Git, enabling collaborative diagram editing and version tracking

No Installation Required

Browser-based editor works on any device - Windows, Mac, Linux, mobile. No software downloads or plugins needed

Privacy Focused

All diagram processing happens locally in your browser. Your diagram data never leaves your device

Professional Quality Output

Generate publication-ready diagrams with clean styling, perfect for technical documentation and presentations

How to Create Mermaid Diagrams - Step by Step Guide

Master diagram creation in minutes

1

Step 1: Choose Your Diagram Type

Select from flowchart, sequence diagram, Gantt chart, class diagram, or start with our pre-built examples

💡 Begin with simple examples to understand the syntax before creating complex diagrams

2

Step 2: Write Mermaid Syntax

Use our intuitive code editor with syntax highlighting. Start with keywords like 'graph TD' for flowcharts or 'sequenceDiagram' for sequence diagrams

💡 The editor provides real-time error detection to help you write correct syntax

3

Step 3: Preview in Real-time

Watch your diagram render instantly in the preview panel. Use zoom controls to inspect details or get an overview

💡 Adjust zoom level to fit your screen and review diagram clarity

4

Step 4: Export and Share

Download as SVG for scalable graphics or PNG for immediate use. Copy the code to share with team members

💡 SVG format is perfect for web use and maintains quality at any size

Mermaid vs Other Diagramming Tools

Why developers and technical professionals choose Mermaid

Mermaid vs Visio

Mermaid offers version control integration and text-based editing, unlike Visio's proprietary binary format. Perfect for developer workflows and collaborative documentation.

Mermaid vs Draw.io

While Draw.io excels at visual editing, Mermaid provides programmatic diagram creation that integrates seamlessly with code repositories and documentation systems.

Mermaid vs Lucidchart

Mermaid is completely free and open-source, with no subscription fees. Diagrams are text-based and can be version controlled alongside your code.

Mermaid vs PlantUML

Mermaid offers simpler syntax and better web integration, while PlantUML requires Java runtime. Both support text-based diagramming but Mermaid has better modern tooling.

Pro Tips for Mermaid Diagram Creation

Expert techniques for better diagrams

Use consistent naming conventions for nodes and connections to improve diagram readability
Break complex diagrams into smaller, focused sub-diagrams for better maintenance
Add comments in your Mermaid code using %% syntax for team collaboration
Use meaningful node IDs and labels to make diagrams self-documenting
Keep line lengths reasonable to ensure diagrams remain readable on different screen sizes
Leverage subgraphs in flowcharts to group related components and improve organization
Use different arrow styles (-->, -.->, ==>) to convey different types of relationships
Test your diagrams at different zoom levels to ensure clarity at various sizes
Save frequently used diagram patterns as templates for faster creation
Use descriptive titles and section labels in Gantt charts for better project communication

Frequently Asked Questions

Can I use Mermaid diagrams in my documentation?

Yes! Mermaid diagrams work perfectly in GitHub README files, GitLab wikis, Notion pages, and many documentation platforms. The text-based format makes them ideal for version control.

Are my diagrams saved automatically?

Diagrams are preserved during your browser session. For permanent storage, copy your Mermaid code or export the diagrams as SVG/PNG files.

Can I customize colors and styling?

Yes, Mermaid supports custom themes and CSS styling. You can define custom colors, fonts, and styling within your diagram definitions.

What's the difference between SVG and PNG export?

SVG is vector-based and scales perfectly at any size, ideal for web use. PNG is raster-based, perfect for presentations and documents that need consistent appearance.

Can I import existing diagrams?

You can upload .mmd, .mermaid, or .txt files containing Mermaid syntax. The tool will load and render your existing diagrams immediately.

Is this tool suitable for large complex diagrams?

Yes! Our editor handles large diagrams efficiently. For very complex systems, consider breaking them into smaller, interconnected diagrams for better maintainability.

Key Benefits of Text-Based Diagrams

Version Control Integration

Track changes, collaborate with teams, and maintain diagram history alongside your code using Git or other VCS systems

Faster Creation Process

Create diagrams faster than drag-and-drop tools once you learn the syntax. Perfect for rapid prototyping and iteration

Consistent Styling

Automatic layout and consistent styling ensure professional-looking diagrams without manual formatting work

Cross-Platform Compatibility

Works on any device with a web browser. No platform-specific software or licensing restrictions

Documentation Integration

Embed diagrams directly in Markdown files, wikis, and documentation systems for seamless integration

Automation Friendly

Generate diagrams programmatically, integrate with CI/CD pipelines, and automate documentation updates