Swimlane Diagram Maker

• Free online swimlane diagram maker that draws cross-functional flowcharts, business process diagrams and SOP flowcharts with Mermaid syntax and real-time preview
• Two editing modes: code mode to write Mermaid code directly (with copy/clear) and visual mode that generates code by adding lanes, steps and connections
• Multiple themes (default / dark / forest / neutral / base), preview zoom (25%–300%) and fullscreen, plus built-in examples ready to load
• Export as SVG or PNG (PNG is a high-resolution 2× render); everything runs locally in your browser — nothing is uploaded

1. Open the tool page — no download or installation needed
2. In the left editor choose "Code" or "Visual" mode: in code mode write Mermaid code directly (or load it from the example dropdown); in visual mode add lanes and steps, configure connections, then click "Generate Code" to create it automatically
3. The preview on the right renders in real time; switch themes, zoom and fullscreen as needed, and fix any syntax errors shown there
4. Once satisfied, click "Download" and pick SVG or PNG from the popup to export

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — nothing is uploaded
• Code mode auto-refreshes by default and shows an error in the preview on syntax mistakes; in visual mode at least one lane is required to generate code

Free online swimlane diagram maker. Quickly draw cross-functional flowcharts, business process diagrams, and SOP flowcharts using Mermaid syntax. Supports real-time preview, theme switching, visual builder, and one-click export to SVG/PNG.

Open the tool page — no download or installation needed In the left editor choose "Code" or "Visual" mode: in code mode write Mermaid code directly (or load it from the example dropdown); in visual mode add lanes and steps, configure connections, then click "Generate Code" to create it automatically The preview on the right renders in real time; switch themes, zoom and fullscreen as needed, and fix any syntax errors shown there Once satisfied, click "Download" and pick SVG or PNG from the popup to export

This tool is completely free and requires no sign-up Everything runs locally in your browser — nothing is uploaded Code mode auto-refreshes by default and shows an error in the preview on syntax mistakes; in visual mode at least one lane is required to generate code

Yes, Swimlane Diagram Maker is completely free. No download or installation required — it runs right in your browser.