ASCII Diagram Generator
Create beautiful ASCII diagrams with visual drawing tools
Drawing Tools
Box Style
What is ASCII Diagram Generator?
Our ASCII Diagram Generator is a free online tool that lets you create text-based diagrams using a visual canvas. Perfect for documentation, code comments, emails, and anywhere you need simple but clear diagrams.
Key Features
- Visual canvas with zoom and pan support for precise drawing
- Multiple drawing tools: boxes, lines, arrows, text, and freehand
- Three box styles: single, double, and rounded corners
- Export to plain text or Markdown code blocks
- One-click copy to clipboard for instant sharing
Common Use Cases
- Technical documentation and README files
- Simple flowcharts and process diagrams
- System architecture and network diagrams
- Code comments and inline documentation
- Plain text emails and communication
How It Works
Simply select a drawing tool from the left panel and start drawing on the canvas. Use boxes for containers, lines and arrows for connections, and text for labels. The ASCII preview updates in real-time.
When finished, copy the ASCII art directly to your clipboard or download it as a text file. The output uses standard Unicode box-drawing characters that work in most terminals and text editors.
Privacy: All drawing happens locally in your browser. No data is sent to any server.
Frequently Asked Questions
What is ASCII art?
ASCII art is a graphic design technique that uses printable characters from the ASCII standard to create visual images. It's commonly used in text-based environments like terminals, code comments, and plain text documents.
Can I use this for commercial purposes?
Yes! Our ASCII Diagram Generator is completely free to use for both personal and commercial projects. No registration or payment required.
Does it work on mobile devices?
Yes, the tool works on mobile devices with touch support for pinch-to-zoom and drawing. For best experience, we recommend using a desktop or tablet.
How do I export an ASCII diagram to a text file?
Click the Export button after finishing your diagram, then choose Download as .txt or Copy to clipboard. Downloads save as plain UTF-8 text files, and clipboard copies paste directly into emails, code editors, or documentation without any formatting loss.
Which characters does the ASCII diagram generator use?
It draws with Unicode box-drawing characters such as ─ │ ┌ ┐ └ ┘ ├ ┤ ┬ ┴ ┼, plus arrows and shading blocks. If you need maximum compatibility, switch to pure ASCII mode using only - | + symbols instead.
Can I paste ASCII diagrams into Markdown or code comments?
Yes. Wrap the diagram in a fenced code block to preserve alignment on GitHub, in Jupyter notebooks, and in most Markdown renderers. In source code, place it inside block comments — it displays correctly as long as the viewer uses a monospace font.
Is there a size limit for the drawing canvas?
The default canvas supports diagrams up to 200 columns by 60 rows, which fits a standard terminal window without wrapping. You can expand it to 400x120 characters for large architecture maps, though wider diagrams may scroll horizontally in chat apps.
Do I need an account to save my diagrams?
No account is required. Diagrams are automatically saved to your browser's local storage every 30 seconds, and you can export a .txt file for permanent backups. Clearing your browser data removes unsaved work, so download important diagrams before switching devices.
References & Resources
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ASCII Art - Wikipedia
History and techniques of ASCII art and text-based illustration.
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ASCII - Wikipedia
The 128-character ASCII encoding that text art is built on.