Beauty Diagram
Use case

Online diagram editor for Mermaid, PlantUML, and draw.io

Use Beauty Diagram as a unified online diagram editor with live preview, beautification, themes, and multi-source support for Mermaid, PlantUML, and supported draw.io imports.

The goal is not to rewrite the diagram from scratch, but to make the source easier to present and reuse.

At a glance

A multi-source editor workflow for teams that need one place to paste, import, preview, beautify, and export diagrams online.

Who this is forLive preview without fragmenting the productTheme-first review loopWhere it fits
Rendered proof
A unified online editor workflow for source, preview, beautify, and export.
Theme · Obsidian
Open this diagram in editor
Paste Mermaid orPlantUML Live preview Import draw.ioXML Beautify layout Try themes Export SVG orPNG
View Mermaid sourcePlain-text diagram syntax — copy or edit directly.
diagram.mmd
1flowchart LR
2  Source[Paste Mermaid or PlantUML] --> Preview[Live preview]
3  Import[Import draw.io XML] --> Preview
4  Preview --> Beautify[Beautify layout]
5  Beautify --> Theme[Try themes]
6  Theme --> Export[Export SVG or PNG]
Pre-rendered examples

Theme and animation variants

Rendered proof
Online editor workflow in Modern theme.
Theme · Modern
Open variant in editor
Paste Mermaid orPlantUML Live preview Import draw.ioXML Beautify layout Try themes Export SVG orPNG
Rendered proof
The same workflow rendered in Atlas theme.
Theme · Atlas
Open variant in editor
Paste Mermaidor PlantUML Live preview Import draw.ioXML Beautify layout Try themes Export SVG orPNG
Rendered proof
The same workflow rendered in Obsidian theme.
Theme · Obsidian
Open variant in editor
Paste Mermaid orPlantUML Live preview Import draw.ioXML Beautify layout Try themes Export SVG orPNG
Rendered proof
Animated preview with Charge motion.
Theme · ModernAnimation · charge
Open variant in editor
Paste Mermaid orPlantUML Live preview Import draw.ioXML Beautify layout Try themes Export SVG orPNG

Who this is for

Teams that receive diagrams from different sources and need one browser-based workflow instead of separate Mermaid, PlantUML, and draw.io tools.

  • Mermaid and PlantUML source editing
  • Supported draw.io XML import paths
  • SVG and PNG handoff for docs and decks

Live preview without fragmenting the product

The editor keeps source, preview, beautification, theme selection, and export in one place. Public examples on this page are pre-rendered SVG proof assets, so the page stays crawlable and does not depend on client-side Mermaid rendering.

Theme-first review loop

After the diagram renders, switch between visual themes to match the destination: quiet documentation, product reviews, architecture notes, or slide decks.

Where it fits

Use this page for searches around online diagram editor, live diagram preview, Mermaid online editor, PlantUML preview, and draw.io cleanup while keeping the main product positioned as a multi-source diagram editor.