Beauty Diagram
UnclaimedTransform your Mermaid, PlantUML, and draw.io diagrams into presentation-grade visuals with one click.
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What is Beauty Diagram?
Beauty Diagram (presentation design): Transform your Mermaid, PlantUML, and draw.io diagrams into presentation-grade visuals with one click. Beauty Diagram is an online editor and beautifier for Mermaid, PlantUML, and draw.io diagrams. It allows users to paste their diagram source code, preview it live, and then apply a set of aesthetic and layout enhancements to create professional-looking diagrams suitable for presentations, documentation, and reports. Beauty Diagram is free to use with no paid tier.
TL;DR - Beauty Diagram
- Beautifies Mermaid, PlantUML, and draw.io diagrams with one click.
- Applies presentation-grade styling, re-layout, and typography.
- Exports high-quality SVG and PNG, including animated SVGs.
Pricing: Free forever
Best for: Individuals & startups
Pros & Cons
Pros
- Transforms basic diagrams into professional, presentation-ready visuals.
- Automates layout and styling, saving significant design time.
- Supports popular text-based diagramming languages (Mermaid, PlantUML).
- Offers advanced visual features like animated SVGs and custom typography.
- Allows color customization directly in the editor without altering source code.
Cons
- Advanced features like draw.io import and 4x PNG export are restricted to the Pro plan.
- Relies on existing diagram code, not a visual diagram builder from scratch.
Key Features
Mermaid editorPlantUML editordraw.io diagram beautifierLive preview of diagramsOne-click layout beautificationOrthogonal routing for flowchartsMultiple thematic styles (modern, atlas, obsidian, atelier)Presentation-grade typography (Geist font, OpenType ligatures)
Pricing Plans
Free
Free forever
- occasional use
About Beauty Diagram
LCLouis CorneloupBeauty Diagram is an online editor and beautifier for Mermaid, PlantUML, and draw.io diagrams. It allows users to paste their diagram source code, preview it live, and then apply a set of aesthetic and layout enhancements to create professional-looking diagrams suitable for presentations, documentation, and reports. The tool focuses on improving the visual quality of diagrams generated from code, addressing common issues like cluttered layouts, generic styling, and poor typography.
This tool is ideal for developers, technical writers, product managers, and anyone who uses text-based diagramming tools but struggles to achieve polished, visually appealing outputs. It streamlines the process of creating high-quality diagrams without requiring manual drawing or extensive design skills, ensuring consistency and saving time. By offering features like intelligent re-layout, thematic styling, and animated SVG previews, Beauty Diagram bridges the gap between code-generated diagrams and presentation-ready visuals.
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Beauty Diagram FAQ
How does Beauty Diagram improve upon the default rendering of Mermaid or PlantUML?
Beauty Diagram post-processes the default render by re-laying out flowcharts on a grid with orthogonal routing, applying presentation-grade typography, using soft shadows instead of borders, implementing a focused one-accent color palette, and offering various themes. It also fixes common issues like cramped spacing in PlantUML activity diagrams and normalizes node sizes.
Can I customize the appearance of my diagram without changing the original Mermaid or PlantUML source code?
Yes, Beauty Diagram allows you to tweak colors directly on the canvas. By clicking any node or line, a floating toolbar appears, enabling you to change background, border, line color, width, and text color. These customizations are saved with the diagram and shared links, while your original source code remains untouched.
What is the difference between exporting as SVG and PNG, and when should I use each format?
SVG (Scalable Vector Graphics) is recommended for anything viewed on screen, such as documentation, websites, or Figma embeds, as it remains crisp at any zoom level. PNG (Portable Network Graphics) is better for decks that will be exported to PDF, printed, or when the destination tool does not support SVG. Beauty Diagram's Pro plan offers 4x resolution PNG exports without watermarks.
How does Beauty Diagram handle draw.io files, and what is the workflow after importing one?
On the Pro plan, you can import a .drawio or .xml export file. Beauty Diagram parses the flowchart or sequence diagram from the file into Mermaid source code. From that point, you continue in the Mermaid workflow, benefiting from the beautification features, and your original draw.io file remains unaltered.
What are animated SVG previews, and how do they enhance diagrams?
Animated SVG previews add subtle motion effects like 'subtle', 'charge', 'laser', or 'pulse' to your diagrams. These animations clarify sequence and direction, particularly useful for flowcharts and sequence diagrams, without requiring you to rewrite or modify the original diagram source code.
Source: beauty-diagram.com