Mermaid Live Editor

Convert text into flowcharts, sequence diagrams, Gantt charts & ER schemas in the Mermaid Live Editor — featuring Hand-Drawn sketch mode, 10 custom color pickers, 1,900+ Google Fonts, .mmd export, pan & zoom preview, and 4K PNG / SVG export — 100% in your browser.

Preset:
1 lines · 0 chars
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Dimensions: 0 × 0 px·Scale: 100%
Mermaid Live Editor — 100% Client-Side Private Diagramming
Drag stage to pan · Scroll wheel to zoom · Click Auto-Fit

What Is the Mermaid Live Editor?

The Mermaid Live Editor is a free, browser-based diagramming tool that transforms plain-text Mermaid syntax into polished, scalable vector graphics in real time. Instead of manually drawing boxes and dragging arrows in design software, you describe nodes, edges, and relationships in a simple text format — and the Mermaid Live Editor instantly renders a clean vector diagram. It supports flowcharts, sequence diagrams, class models, state machines, ER schemas, Gantt charts, mindmaps, C4 architecture, Git graphs, Kanban boards, pie charts, and user journeys.

Designed for modern software teams, the Mermaid Live Editor combines Hand-Drawn sketch mode (with wobbly pencil lines and Patrick Hand font), 10 custom color pickers, 1,900+ Google Fonts, .mmd file import/export, up to 4K PNG resolution, and shareable URL links with 100% private client-side browser rendering.

Hand-Drawn Sketch Mode
10 Custom Color Pickers
1,900+ Google Fonts
.mmd, SVG & 4K PNG Export
# Title## Section- item one- item two```

From Plain Text to Live Vector Diagrams

The Mermaid Live Editor turns text syntax into polished, scalable vector diagrams in real time. Describe nodes and flows in words, choose custom colors, Hand-Drawn sketch mode, and 1,900+ Google Fonts, and the Mermaid Live Editor draws the flowchart, sequence diagram, or class model for you.

Mermaid Syntax
flowchart LRA[Start] --> B{Check}B -->|Yes| C[Ship]B -->|No| D[Fix]C --> E[Done]D --> BMMD
Rendered Diagram
SVG

9 Powerful Features of the Mermaid Live Editor

A complete online Mermaid Live Editor for writing, navigating, Hand-Drawn sketching, custom colors, 1,900+ Google Fonts, .mmd export, 4K PNG export, and sharing text-driven diagrams.

Text-to-Diagram Live Preview

The Mermaid Live Editor converts plain-text syntax into vector flowcharts, sequence diagrams, class models, state machines, ER schemas, and mind maps in real time as you type.

Hand-Drawn Sketch Mode

Toggle Hand-Drawn mode in the Mermaid Live Editor to render sketchy rough pencil lines, wobbly stroke borders, solid triangle arrows, and handwritten Patrick Hand font for Excalidraw-like diagrams.

5 Themes & 10 Custom Color Pickers

Switch between 5 built-in color themes (Default, Neutral, Dark, Forest, Base) or enable 10 custom color pickers in the Mermaid Live Editor for node fill, node text, borders, lines, arrows, and backgrounds.

1,900+ Google Fonts Integration

Search and apply 1,900+ Google Fonts (Inter, Roboto, Fira Code, Patrick Hand, Kalam, Caveat) directly inside the Mermaid Live Editor with zero initial page load overhead.

Interactive Pan & Zoom Canvas

Navigate complex diagrams in the Mermaid Live Editor with scroll-to-zoom, click-and-drag pan, one-click Auto-Fit framing that maximizes viewport fill, and an optional dot-grid canvas background.

.mmd Source File Import & Export

Upload existing .mmd or .txt files and export your Mermaid diagram source code as .mmd files directly from the Mermaid Live Editor for version control and cross-tool sharing.

SVG & 1x to 4K High-Res PNG Export

Export crisp vector SVG files or high-resolution PNG images at 1x, 2x, 3x, or 4x 4K print quality directly from the Mermaid Live Editor workspace.

Shareable URL Link Generator

The Mermaid Live Editor encodes your diagram code into shareable URL links so teammates can view, edit, and collaborate on live diagrams instantly — no account required.

24+ Templates & 14 Cheatsheet Blocks

Explore 24+ built-in diagram templates across 10 categories plus a comprehensive Syntax Cheatsheet covering 14 diagram types with one-click snippet insertion inside the Mermaid Live Editor.

24+ Mermaid diagram templates across 10 categories in the Mermaid Live Editor including flowcharts, sequence diagrams, class models, state machines, ER schemas, and mind maps

24+ Diagram Templates, Hand-Drawn Sketching & 1,900+ Google Fonts

The Mermaid Live Editor combines 24+ templates across 10 categories with Hand-Drawn sketch mode, 5 built-in themes, 10 custom color pickers, 1,900+ Google Fonts, .mmd source export, and a comprehensive 14-block syntax cheatsheet.

  • Interactive pan & zoom canvas with Auto-Fit viewport fill and dot-grid toggle
  • Hand-Drawn sketch mode with wobbly pencil lines, solid triangle arrows & Patrick Hand font
  • 10 custom color pickers for node fill, text, borders, lines, arrows & backgrounds
  • 1,900+ Google Fonts search, .mmd source export, 1x-4x 4K PNG, vector SVG & shareable URL links

How to Use the Mermaid Live Editor in 3 Steps

Write Mermaid code, customize colors and fonts, and export .mmd, SVG, or 4K PNG diagrams or share links in seconds.

1

Write Mermaid code, load a template, or upload .mmd

Type syntax into the Mermaid Live Editor, load a preset from the 24+ template library across 10 categories, upload a .mmd file, or insert snippets from the Syntax Cheatsheet tab.

2

Toggle Hand-Drawn mode, custom colors & Google Fonts

Switch between Classic and Hand-Drawn sketch modes, fine-tune 10 custom color slots, search 1,900+ Google Fonts, and use the interactive pan & zoom canvas to explore your diagram.

3

Export .mmd, 4K PNG, SVG, or share a live link

Download your Mermaid source as .mmd, export high-res PNG (up to 4x 4K), save SVG, copy images to clipboard, or generate a shareable URL link — all 100% private in the Mermaid Live Editor.

Who Uses the Mermaid Live Editor

From software architects to product managers, anyone who prefers text-based diagramming uses the Mermaid Live Editor to keep visuals versionable, brand-customized, and in sync.

Software Architects & Engineers

Design system architecture, microservice sequence flows, and database ER schemas in the Mermaid Live Editor as version-controllable plain text with custom color branding.

Technical Writers & Documentation

Create flowcharts, class models, and mind maps in the Mermaid Live Editor and embed them natively into GitHub READMEs, Notion pages, GitLab wikis, and developer docs.

Students & Technical Educators

Use the Mermaid Live Editor to illustrate algorithms, state machines, and data structures in Hand-Drawn sketch mode with custom fonts and colors for slides and assignments.

Product Managers & Agile Teams

Generate Gantt timeline roadmaps, user journey maps, and decision trees in the Mermaid Live Editor for sprint planning, retrospectives, and stakeholder presentations.

Your Diagrams Stay 100% Private

The Mermaid Live Editor parses, renders, and exports diagrams locally in your browser tab. Confidential architecture and workflow diagrams are never sent to a remote server.

  • Your Mermaid code is transformed into vector diagrams locally in your browser — nothing is transmitted to remote render servers.
  • The Mermaid Live Editor works completely offline once the web application is loaded in your browser tab.
  • No sign-up, no render queue — diagrams redraw instantly as you edit text in the Mermaid Live Editor.
  • Safe for internal system architecture, security workflows, confidential product roadmaps, and database ER schemas.
100% in your browser

Mermaid Live Editor — Frequently Asked Questions

Common questions about customizing, Hand-Drawn sketching, exporting, and sharing diagrams in the Mermaid Live Editor.

What is the Mermaid Live Editor?
The Mermaid Live Editor is a free online tool that converts plain-text Mermaid syntax into vector SVG diagrams in real time — supporting flowcharts, sequence diagrams, class models, state machines, ER schemas, Gantt charts, mindmaps, C4 architecture, Git graphs, Kanban boards, and Hand-Drawn sketch diagrams.
How does Hand-Drawn sketch mode work in the Mermaid Live Editor?
Click the Hand-Drawn button in the top-right toolbar or config panel of the Mermaid Live Editor. It applies SVG fractal noise displacement filters to render wobbly pencil stroke borders, hatching fills, solid triangle arrows, and handwritten Patrick Hand font for an authentic hand-sketched look.
Can I use custom colors and 1,900+ Google Fonts in the Mermaid Live Editor?
Yes. The Mermaid Live Editor provides 5 built-in themes plus 10 custom color pickers for node fill, text, borders, lines, arrows, and backgrounds. You can also search and apply 1,900+ Google Fonts (Inter, Roboto, Fira Code, Patrick Hand, Kalam, Caveat, etc.) with zero initial page load overhead.
Can I upload and export .mmd files in the Mermaid Live Editor?
Yes. The Mermaid Live Editor supports uploading .mmd and .txt files and exporting your diagram source code as .mmd files for version control, GitHub backup, or sharing with other Mermaid-compatible tools.
Does the Mermaid Live Editor support pan and zoom navigation?
Yes. The Mermaid Live Editor includes interactive canvas controls: mouse wheel zooming, drag-to-pan, percentage display, 100% reset, one-click Auto-Fit framing that maximizes viewport fill, and an optional dot-grid background.
Which export formats and PNG resolutions are supported?
The Mermaid Live Editor exports .mmd Mermaid source files, vector SVG files, and PNG images with customizable resolution scale factors (1x, 2x, 3x, 4x 4K print quality). You can also copy PNG images directly to your system clipboard.
Can I generate a shareable URL link for my diagram?
Yes. The Mermaid Live Editor encodes diagram code into shareable URL links so you can send live editable diagrams to teammates without uploading anything to a server.
How many diagram templates and cheatsheets does the Mermaid Live Editor include?
The Mermaid Live Editor includes 24+ ready-to-use templates across 10 categories (Basic, UML, Database, Project, Brainstorm, Charts, Architecture, DevOps, Engineering) plus a comprehensive Syntax Cheatsheet tab covering 14 diagram types with one-click snippet insertion.
Can I paste diagrams into GitHub, Notion, or GitLab?
Yes. GitHub, GitLab, and Notion render Mermaid natively — wrap your code in a ```mermaid fenced block or copy the SVG markup directly from the Mermaid Live Editor.
Are diagrams uploaded to a remote server?
No. All parsing, rendering, and exporting in the Mermaid Live Editor run 100% client-side in your browser tab for complete data privacy.

Start Using the Mermaid Live Editor

Scroll back up, write Mermaid syntax, customize colors and fonts, toggle Hand-Drawn mode, and generate flowcharts, sequence diagrams, and mind maps with .mmd / SVG / 4K PNG export — free and 100% private in the Mermaid Live Editor.