DocBox — Markdown, Diagram & Gantt Editor in Your Browser
DocBox is a free, private workspace that runs entirely in your browser: write and render Markdown with PlantUML / Mermaid diagrams and KaTeX math, build Gantt charts visually, and export documents or diagrams without uploading anything.
How it works
- Open DocBox and pick a workspace — Markdown, PlantUML / UML, Mermaid or the Gantt chart editor
- Write or paste your content; diagrams and math render locally as you type
- Export documents as standalone HTML or PDF, and diagrams as SVG / PNG / JPG / PDF
Frequently asked questions
- Do my documents get uploaded?
- No. Everything is parsed and rendered locally in your browser — opening local files does not even need a network connection.
- Which diagram languages are supported?
- PlantUML (sequence, activity, use case, class, state, component, mind map, Gantt) and Mermaid (flowchart, sequence, class, pie and more), plus KaTeX math formulas.
- What can I export?
- Single diagrams as SVG / PNG / JPG / PDF; whole documents as standalone HTML or print to PDF.
- Do I need to sign up or install anything?
- It is free and requires no account — just open it. You can also install it as a desktop app for offline use.