Transform your Mermaid, PlantUML, and draw.io diagrams into presentation-grade visuals with one click.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Transforms basic diagrams into professional, presentation-ready visuals.
Biggest con
Advanced features like draw.io import and 4x PNG export are restricted to the Pro plan.
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
What is Beauty Diagram?
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. 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.
Available on: Web
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
Pricing checked Jun 14, 2026
Free
Free forever
- occasional use
Reviews
$99Free with your review
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Beauty Diagram FAQ
How does Beauty Diagram enhance existing diagrams?
Beauty Diagram takes your Mermaid, PlantUML, or draw.io diagram source code and applies aesthetic and layout enhancements. It improves visual quality by addressing issues like cluttered layouts, generic styling, and poor typography, transforming them into presentation-grade visuals.
Which diagramming languages does Beauty Diagram support?
Beauty Diagram supports popular text-based diagramming languages, specifically Mermaid and PlantUML. It also offers import capabilities for draw.io diagrams, allowing users to beautify diagrams created with these tools.
What kind of user benefits most from Beauty Diagram?
Beauty Diagram is ideal for developers, technical writers, and product managers who use text-based diagramming tools. It helps users achieve polished, visually appealing outputs for presentations, documentation, and reports without requiring extensive design skills.
How does Beauty Diagram compare to a tool like draw.io?
Beauty Diagram acts as an editor and beautifier for diagrams, including those from draw.io, focusing on enhancing visual quality and layout. Unlike draw.io, which is a visual diagram builder from scratch, Beauty Diagram relies on existing diagram code to apply automated styling and advanced visual features.
What are the main limitations of Beauty Diagram?
Beauty Diagram relies on existing diagram code and is not a visual diagram builder from scratch. Additionally, some advanced features, such as draw.io import and 4x PNG export, are restricted to the Pro plan.
Does Beauty Diagram include a free tier?
Yes, Beauty Diagram is free to use, and a paid plan is not required to access its core functionalities. Certain advanced features, however, are part of a Pro plan.
Can users customize diagram colors without changing the source code?
Yes, Beauty Diagram allows users to customize diagram colors directly within its editor. This feature enables thematic styling without needing to alter the original Mermaid, PlantUML, or draw.io source code.
Source: beauty-diagram.com