Beauty Diagram — Mermaid Online Live Editor with Beautify & Export

MERMAID · PLANTUML · DRAW.IO EDITOR WITH A BEAUTIFIER<br>Your diagrams<br>render fine.<br>We make them beautiful.<br>Beauty Diagram is a Mermaid online live editor, PlantUML editor, and diagram beautifier for draw.io workflows. Paste source, preview it live, clean up the layout in one click, and export beautiful diagrams as SVG or PNG.<br>Open the editorWatch 30-sec brand film<br>14<br>Diagram types

Themes

Animations

diagram.mmd<br>MERMAIDPLANTUMLDRAW.IO

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RENDER & BEAUTIFY

Beauty DiagramClassicSVGPNG

Try a sample:Install flowTiny handshakeTwo tables

NEWAlso available as a plugin<br>Beautify diagrams without leaving your notes, code, or browser.

Chrome Obsidian VS Code CLI

§01 · Compare<br>Default render.<br>Beauty Diagram.<br>One drag apart.

Same source code. On the left, what Mermaid's native renderer gives you by default. On the right, what Beauty Diagram does with it. Drag the handle to compare.

Native renderer<br>Beauty Diagram

Drag to beautify

§02 · What changes<br>Six things your default renderer doesn't do.

Every beautified diagram is re-laid out and re-styled with the same set of rules. No per-diagram fiddling.

Re-layout for flowcharts<br>Mermaid, PlantUML, and draw.io flowcharts get re-laid out on a grid with orthogonal routing — no diagonal arrows cutting through nodes.

9 themes you can swap<br>Switch between modern, atelier, atlas, obsidian, and more without editing the source. The same Mermaid renders for a deck, a doc, or a dark-mode README.

Editorial-grade typography<br>Geist at 14px / 500 with OpenType ligatures and baseline-aligned labels. The diagram looks like a slide, not a wiki page.

AI generate / refine<br>Describe what you want in plain English — AI drafts the Mermaid or PlantUML source, then refine an existing diagram with the same loop. No prompt engineering required.

Embed straight into READMEs<br>Drop a Beauty Diagram image URL into any markdown (GitHub, Notion, Medium) — the rendered SVG loads on every view. No save, no re-export when you tweak the source.

5 animated SVG styles<br>Layer subtle, lightning, laser, charge, or pulse motion onto the same Mermaid source. Clarifies sequence and direction without rewriting the diagram.

14 types →FlowchartSequenceGanttMindmapActivitySwimlaneClassStateERPieGit GraphC4JourneyTimeline

§03 · Beauty Diagram vs Mermaid Live · vs Excalidraw · vs Figma<br>Fits where other tools don't.

There are plenty of ways to draw a diagram. Beauty Diagram is the only one that takes the text you already wrote and gives you a render you'd actually put on a slide.

Beauty DiagramMermaid LiveExcalidrawFigma / SketchInput is code you already haveSupports Mermaid + PlantUML + draw.ioSleek, modern styling out of boxmanualRe-layout (orthogonal routing, lanes)AI generate / refine from a promptEmbed via image URL (GitHub README, Notion)No manual drawing requiredVersion-controllable sourceAnimated SVG preview (no rewrite of source)Export 4× PNG without watermark

§03.5 · Questions you were about to Google<br>The short answers.

We collected the searches that lead people here and answered them plainly — no fluff, no “it depends.”

How do I beautify a Mermaid flowchart?<br>Paste your Mermaid source into the editor. Beauty Diagram re-lays it out with orthogonal routing, applies a sleek, modern palette, and exports SVG in under 400ms. You keep the original code; only the render changes.

How do I improve a PlantUML activity diagram?<br>Same flow — swap the tab to PlantUML, paste, click Beautify. The diagram formatter realigns swimlanes, normalizes node sizes, and fixes the cramped default spacing that PlantUML ships with.

Mermaid vs PlantUML — which should I use?<br>Mermaid is easier to read in Markdown and has wider native support (GitHub, Notion). PlantUML is more expressive for UML — class, sequence, state, activity. Beauty Diagram supports both, so pick whichever your source tree already uses.

Can I import a draw.io file?<br>Yes — free, no signup needed. Drop a .drawio or .xml export into the editor — compressed or uncompressed both work — and we convert flowcharts, sequence diagrams, class and entity-relationship diagrams, mindmaps, and git branching diagrams into Mermaid source, then beautify from there. An optional AI-enhance toggle for messier diagrams is included with Pro and Premium, or payable per use from a credit pack. You stay in the Mermaid workflow after import, with the original file untouched.

SVG vs PNG for diagrams — which export format?<br>SVG for anything that will be viewed on screen (docs, websites, Figma embeds) — it stays crisp at any zoom. PNG for decks that will be exported to PDF or printed, or when the destination tool does not support SVG. Beauty Diagram exports 4× PNG on Pro — no watermark.

Can I export Mermaid to SVG or PNG without rendering manually?<br>Yes. Every beautified diagram gets a one-click export to both SVG and PNG. No CLI, no puppeteer, no Node dependency to install.

Is this just a Mermaid Live editor...