Live editor with beautify
Paste Mermaid or PlantUML source, preview it in the browser, and apply a one-click beautify pass that re-lays out the diagram instead of changing your source.
Beauty Diagram
Beauty Diagram is an online Mermaid and PlantUML editor that live-previews text diagrams, beautifies their layout, and exports SVG or PNG. It also supports Pro draw.io workflows and integrations for Obsidian and VS Code-family editors.
What Beauty Diagram is
Beauty Diagram is an online diagram editor and beautifier for Mermaid, PlantUML, and some draw.io workflows. It is built for people who already write diagrams as text and want a cleaner render without manually redrawing shapes or connectors.
The core workflow is straightforward: paste source, preview it live, run Beautify to re-layout the diagram, then export the result as SVG or PNG. The site positions the product for diagrams that need to look polished in docs, notes, and slide decks, while keeping the source code intact for reuse in version-controlled workflows.
Core features
Multiple diagram formats
Supports Mermaid, PlantUML, and Pro draw.io workflows, so diagrams can stay in the format you already use.
SVG and PNG export
Exports beautified diagrams as SVG or PNG, with the site also describing 4× PNG export on Pro and no watermark for complete Pro exports.
Theme-based styling
Offers theme switching so the same diagram can be styled differently for docs, decks, or dark-mode notes without editing the underlying code.
Animated previews
Includes animated SVG styles such as subtle, lightning, laser, charge, and pulse, which add motion without rewriting the diagram source.
AI-assisted diagram creation
Supports AI generate and refine flows that draft Mermaid or PlantUML source from plain English and then iterate on an existing diagram.
Where it fits
Documentation diagrams
Create or polish flowcharts and activity diagrams from Mermaid or PlantUML source, then export a cleaner version for documentation or presentation use.
Note-taking and Markdown workflows
Beautify diagrams directly inside Obsidian or Markdown Preview in VS Code, Cursor, Windsurf, VSCodium, Gitpod, or Codespaces without switching tools.
draw.io-to-text cleanup
Import supported draw.io diagrams on Pro, convert them into Mermaid-based workflow, and keep working with text-driven edits afterward.
Presentation graphics
Use the live preview and SVG/PNG export path to produce slide-ready visuals for decks, PDFs, or other publishable assets.
Drafting from prompts
Try AI generation or refinement when you want a diagram draft from plain English before editing the source by hand.
Pros and Cons
Pros
- Works with Mermaid and PlantUML, with draw.io support available on Pro.
- Keeps the original diagram source while changing only the render.
- Provides live preview plus one-click beautify, which suits text-first workflows.
- Offers SVG and PNG export for both web and presentation use.
- Has editor integrations for Obsidian, VS Code-family IDEs, and a CLI.
Cons
- draw.io import is limited to Pro.
- Watermark-free share mode and some themes require paid plans.
- Rendering for the Obsidian plugin happens server-side, so it is not an offline-first tool.
FAQ
How do I beautify a diagram in Beauty Diagram?
Paste Mermaid or PlantUML source into the editor, choose a sample if needed, and use Beautify to re-layout and restyle the diagram. The editor then lets you export the result as SVG or PNG.
Can I import draw.io files?
Yes. The site states that draw.io import is available on Pro plans, and imported flowcharts or sequence diagrams are converted into Mermaid source before beautification.
Which diagram formats are supported?
The product supports Mermaid and PlantUML in the editor, with draw.io workflows available on Pro. The Obsidian and VS Code integrations also render Mermaid and PlantUML blocks.
Is there a free version?
Yes. The free tier is available for occasional use, while Pro and Premium unlock watermark-free share mode and additional themes. The pricing page also offers one-time credit packs for pay-as-you-go use.
What export formats are available?
The product provides SVG export and PNG export, and the site specifically mentions clean SVG and HD PNG output. SVG is positioned for on-screen use, while PNG is useful for decks or print workflows.
Quick Facts
- Category
- Diagram editor and beautifier
- Primary formats
- Mermaid, PlantUML, and draw.io on Pro
- Core workflow
- Paste source, preview live, beautify, export
- Integrations
- Obsidian, VS Code family, CLI
- Pricing model
- Free tier, Pro/Premium plans, and one-time credit packs
- Source domain
- beauty-diagram.com
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