Features & Templates
A complete tour of the editor and all 64 ready-made templates — flowcharts, sequence diagrams, Gantt charts, architecture and security models. Free, no login, and everything runs locally in your browser.
Latest updates and improvements to SimpleMermaid
Professional diagramming made simple with powerful features and seamless collaboration.
Start creating instantly. No signups, no passwords, no barriers. Share with anyone - they don't need accounts either.
No server storage, all processing happens in your browser. Your diagrams stay private.
Live diagram updates as you type. See your changes in real-time with no delays or refresh needed.
Create shareable links in seconds. No file uploads, no account requirements. Your diagrams are embedded in the URL and work on any device and never expire.
Download as PNG, SVG, PDF or Markdown, with your highlights included if you like. Perfect for presentations and documentation.
64 ready-made templates including flowcharts, sequence diagrams, and architecture diagrams.
Save your work locally in your browser with auto-save. Manage multiple diagrams with import/export backup.
Light and dark modes, plus Mermaid's own Default, Neutral, Forest and Dark diagram themes. Pick the look that fits your docs.
Mark up your diagram like a whiteboard: highlighter, pen and eraser in six colors. Drawings stay glued to the diagram and are included in your PNG, SVG and PDF exports.
From quick brainstorms to formal documentation, see how teams use SimpleMermaid.
Unlike other tools, your shared links never expire. Bookmark them, embed in documentation, or share with future team members.
The fastest and most intuitive way to create professional diagrams. Built for developers, technical writers, project managers, and students.
Jump-start your project with our collection of pre-built diagram templates. Click any template to open it in the editor.
SimpleMermaid is a free online editor that lets you create professional diagrams just by typing. Instead of dragging boxes and drawing arrows, you describe what you want in plain text and the diagram appears instantly. It's built on Mermaid.js — an open-source language that's quickly becoming the standard way developers create diagrams.
Why is this the future? Because diagrams as code can be version-controlled, reviewed in pull requests, and updated in seconds. No more outdated screenshots or clunky drawing tools. Just write a few lines, get a shareable link, and your whole team is on the same page.
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