Text-to-Diagram Editor
Create professional diagrams from simple text. Compatible with Mermaid syntax.
Jump to Section:
Live Preview
Enter diagram code to see preview
What is a Text-to-Diagram Editor?
A text-to-diagram editor converts simple text syntax into visual diagrams. Instead of dragging and dropping shapes, you write code-like instructions that describe your diagram's structure. This approach is called "diagram as code" and is popular among developers because diagrams can be version-controlled alongside source code, reviewed in pull requests, and generated programmatically. This editor uses Mermaid syntax, the same text-to-diagram format supported natively by GitHub, GitLab, Notion, Confluence, Azure DevOps, and many other platforms. If you've written diagrams in GitHub markdown, the same code works here.
Common Use Cases
- •Technical Documentation - Add diagrams directly to your GitHub README, Confluence pages, or internal wikis. The text-based format means diagrams live alongside your code and stay version-controlled.
- •Architecture Design - Sketch system architectures, microservice interactions, and data flows. Share designs with your team via URL—no accounts or file attachments needed.
- •API Documentation - Create sequence diagrams showing request/response flows between clients, servers, and databases. Perfect for documenting REST APIs and microservice communication.
- •Database Modeling - Design ER diagrams before writing migrations. Export as SVG to include in technical specs and data architecture documents.
- •Project Planning - Build Gantt charts for sprint planning or roadmap presentations. Update the text and the timeline updates instantly.
- •Code Reviews - Explain complex logic with flowcharts. Paste the shareable URL in your PR description so reviewers can visualize the flow.
Tip: Start with the templates above—click any template to see working code. The official Mermaid documentation at mermaid.js.org has comprehensive syntax guides for each diagram type.
How to Use This Tool
- 1
Write your diagram
Enter your diagram code using simple text syntax in the editor. Start with a template or write from scratch.
- 2
See it render instantly
The preview panel updates automatically as you type. The diagram renders in real-time.
- 3
Share or export
Generate a shareable URL, download as PNG for presentations, or export as SVG for web use. No account required—your diagrams stay in your browser.
Supported Diagram Types
Flowcharts
Process flows, decision trees, and workflows. Use graph TD (top-down) or graph LR (left-right) to control direction.
Sequence Diagrams
Show interactions between systems or users over time. Perfect for API documentation and system design.
Class Diagrams
Visualize object-oriented structures, inheritance, and relationships between classes.
Entity Relationship Diagrams
Database schema visualization showing tables, columns, and their relationships.
State Diagrams
Model state machines and transitions for UI flows, order processing, or system states.
Gantt Charts
Project timelines with tasks, dependencies, milestones, and date ranges.
Git Graphs
Visualize branching strategies, merge histories, and release workflows.
Pie Charts
Simple data distribution visualization with labels and percentages.
Mind Maps
Hierarchical brainstorming and concept organization in a tree structure.
Timelines
Historical events, product roadmaps, or milestone visualization.
Quadrant Charts
Priority matrices, effort/impact analysis, and 2x2 decision grids.
Frequently Asked Questions
What syntax does this editor use?
This editor uses Mermaid syntax, the same text-to-diagram format supported by GitHub, GitLab, Notion, Confluence, and many other platforms. If you've written diagrams in GitHub markdown, the same code works here.
Is this tool free?
Yes, completely free with no limits. No signup, no watermarks, no restrictions on exports.
Where is my diagram data stored?
Nowhere. Everything runs in your browser. Your diagram code never leaves your device unless you share the URL. Even then, the diagram is encoded in the URL itself—there's no server storage.
How do shareable URLs work?
When you click Share, your diagram code is compressed and encoded directly into the URL. Anyone with that URL can see and edit a copy of your diagram. The URL contains the entire diagram—no database lookup required.
Can I use these diagrams commercially?
Yes. Diagrams you create are yours. Export as PNG or SVG and use them anywhere—documentation, presentations, products, client work.
What's the difference between PNG and SVG export?
PNG is a raster image—best for presentations, Slack, or anywhere you need a simple image file. SVG is vector-based—it scales to any size without quality loss, ideal for web pages or print.
Does this work offline?
Once the page loads, yes. The editor and renderer run entirely in your browser. You can create and export diagrams without an internet connection.
How do I learn Mermaid syntax?
Start with the templates above—click any template to see working code. The official Mermaid documentation at mermaid.js.org has comprehensive syntax guides for each diagram type.
Can I embed diagrams in my website?
Export as SVG and embed directly in HTML. Or use the Mermaid.js library to render diagrams dynamically from text in your own application.
What if my diagram URL is too long?
Complex diagrams create long URLs. If you hit browser limits (roughly 2,000 characters), simplify your diagram or split it into multiple diagrams. The tool warns you when URLs get very long.