ASCII Art to UML Converter
Convert ASCII art class-style diagrams into Mermaid UML code with live browser rendering plus source, SVG, and JPEG export
This converter is optimized for simple ASCII art class diagrams with boxes, members, and arrows. After conversion, you can keep editing the Mermaid source and the preview will refresh automatically.
ASCII UML Input
Mermaid UML Output
Edit the generated Mermaid class diagram code directly. The preview below updates automatically after changes.
Mermaid UML Preview
Preview idleExport Tools
Diagram Notes
Why Use This ASCII Art to UML Converter?
This page is built around a practical workflow: turn a plain-text class sketch into editable Mermaid UML, preview it immediately, and export it for docs or team communication.
Made for Class-Style ASCII Diagrams
It works best on box-based ASCII art that represents classes, members, and simple relationships rather than fully freeform drawings.
Outputs Editable Mermaid Source
Instead of locking the result into a static image, the tool produces Mermaid class diagram code you can keep refining.
Preview and Export in One Flow
Generate code, inspect the rendered result, then export source, SVG, and JPEG files from the same page.
How to Convert ASCII Art to UML
Use this flow when you have a quick ASCII class sketch and want a cleaner Mermaid UML version without rebuilding everything manually.
Paste your ASCII class diagram
Add a class-style ASCII sketch with box labels, members, and arrows into the input panel.
Choose a layout direction
Leave the direction on Auto, or force a left-to-right or top-to-bottom layout when your diagram has a clear reading order.
Generate Mermaid UML
Click Convert to UML to create Mermaid class diagram code and render the preview in the browser.
Edit and export the result
Refine the Mermaid source if needed, then copy it or download .mmd, SVG, and JPEG outputs.
ASCII Art to UML FAQ
These are the common questions users have when turning text-based class sketches into Mermaid UML.
What kind of ASCII diagrams work best for this tool?
It performs best on box-based class sketches that include class names, attributes, methods, and simple arrows. Highly decorative ASCII art or dense multi-diagram inputs may need manual cleanup after conversion.
Does the result stay editable?
Yes. The main output is Mermaid class diagram source, so you can continue editing the generated UML directly in the result panel or in your own documentation workflow.
Can I preview the Mermaid UML without leaving the page?
Yes. Rendering happens in the browser with Mermaid.js, so the preview updates on the same page after conversion and when you edit the generated source.
Why does the generated UML sometimes need manual edits?
ASCII art rarely contains perfect structural metadata. The converter uses heuristics to detect classes and relationships, which makes it fast and useful, but manual refinement can still improve naming and relationships.
Can I export the rendered result as an image?
Yes. After Mermaid rendering succeeds, you can download the diagram as SVG for vector quality or as JPEG for broader compatibility in slides and chat tools.
About This ASCII to UML Converter
This tool targets a practical search intent: converting an ASCII art class sketch into editable UML without redrawing it from scratch. It uses Mermaid class diagram syntax because Mermaid is widely used in engineering documentation, markdown workflows, and browser-based documentation systems.
When an ASCII Art to Mermaid UML Tool Is Useful
This workflow is useful when you sketch a quick class model in tickets, markdown notes, code reviews, architecture docs, or whiteboard follow-up text. Instead of leaving the diagram as raw ASCII, you can turn it into Mermaid UML that is easier to maintain and easier to share.
Tips for Better ASCII to UML Output
- Keep one class per box and place members on separate lines whenever possible.
- Use simple directional arrows so relationships are easier to detect.
- Treat the generated Mermaid code as a first draft and refine names or links when necessary.
- Use SVG export for documentation and JPEG export for slides or chat tools.
- If auto layout is not ideal, switch the direction manually before converting again.
Scope and Limitations
The page is intentionally focused on simple ASCII class-style diagrams and Mermaid UML output. It does not try to fully reconstruct every possible UML notation or every complex ASCII drawing. That narrower scope keeps the tool faster, more understandable, and closer to the user intent behind this keyword.