MarkBun
v0.4.0 Preview

The Free, Open-Source
Markdown Editor
You Deserve

Free & Open-Source, Write Without Limits

MarkBun brings distraction-free WYSIWYG markdown editing to everyone — completely free, forever. Carved for focus, built for speed.

Download Free code View on GitHub
MarkBun
expand_more folder markbun
chevron_right folder artifacts
chevron_right folder build
chevron_right folder dist
chevron_right folder docs
chevron_right folder icon.iconset
chevron_right folder node_modules
chevron_right folder scripts
chevron_right folder src
chevron_right folder tests
chevron_right folder website
markdown AGENTS.md
markdown CHANGELOG.md
markdown CONTRIBUTING.md
markdown README.md
markdown ROADMAP.md
markdown demo.md
description llms.txt

Getting Started with MarkBun

MarkBun is a WYSIWYG editor that doesn't hide the power of Markdown. Just type and see the results instantly.

Code Example

const hello = "MarkBun World";
console.log(hello);

Rich Features

Supports Tables, KaTeX formula E = mc², and Mermaid diagrams. All powered by Bun and Milkdown.

Formula Example

The famous mass-energy equivalence:

E = mc²

Precision Tools for Modern Writers

Everything you need, nothing you don't. Pure focus.

volunteer_activism

Free Forever

No subscriptions, no "pro" tiers, no hidden costs. Open source and free for the community.

bolt

Blazing Fast

Built with Bun and Vite for near-instant startup times and zero lag even in massive documents.

visibility

True WYSIWYG

The editing experience is the preview experience. Seamlessly transition between modes.

shield

Your Data is Safe

Local-first architecture. We never touch your files or upload them to a cloud server.

devices

Cross-Platform

Running natively on macOS, Windows, and Linux with a consistent, premium experience.

weight

Lightweight

Minimal memory footprint. MarkBun is designed to stay out of your way while you work.

Everything you expect from
top-tier editors.

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    WYSIWYG Editing

    Real-time rendering of your markdown as you type.

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    Source Mode & Focus Mode

    Switch to raw markdown or hide the UI for deep focus sessions.

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    Tables & KaTeX Support

    First-class support for complex tables and mathematical notation.

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    Mermaid Diagrams

    Visualize flows, charts, and diagrams directly in your docs.

Features arrow_forward
```mermaid
graph TD
A[Open File] --> B{Edit Mode?}
B -->|WYSIWYG| C[Milkdown]
B -->|Source| D[CodeMirror]
```
Open File
Edit Mode?
Milkdown
CodeMirror
hub

Built in the open, for everyone.

MarkBun is licensed under MIT. We believe in transparency and community-driven development. No paywalls, no proprietary lock-ins.

star Star on GitHub
verified_user MIT Licensed

Powered by cutting-edge tech

Electrobun
Milkdown
React 18
Bun
Vite 6
Tailwind
CodeMirror
KaTeX
Mermaid
i18next
Zod
TypeScript

Ready to write without limits?

Join thousands of writers using MarkBun today. v0.4.0 preview release.

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Version v0.4.0 • Open Source MIT