Live split-pane Markdown preview
Write Markdown on the left, see the rendered output on the right. Every keystroke updates the preview instantly, with no save and no refresh.
A fast browser-based Markdown editor with live preview, diagrams, math, syntax highlighting, and export options. All the tools you need for writing. Runs entirely in your browser.
No install, no account required.
# Welcome to EDTR.md
A **modern** markdown editor
## Features
- [x] Live preview
- [x] Syntax highlighting
- [ ] Take over the world
$E = mc^2$
EDTR.md Features
Live preview, syntax highlighting, diagrams, math, charts, music notation, and export. Everything a Markdown editor should have, with zero setup.
Write Markdown on the left, see the rendered output on the right. Every keystroke updates the preview instantly, with no save and no refresh.
Powered by CodeMirror 6 and highlight.js with GitHub-style colors for JavaScript, Python, Rust, Go, and more.
Create flowcharts, sequence diagrams, Gantt charts, and more with plain-text Mermaid syntax. Rendered inline in the preview.
Write inline ($...$) and block ($$...$$) LaTeX math equations, rendered instantly by KaTeX.
Switch to a GitHub-inspired dark theme. Syntax colors, diagrams, scrollbars, and the entire UI adapt automatically.
GitHub Flavored Markdown task lists become clickable checkboxes. Toggle items and the source updates automatically.
Write ABC notation in fenced code blocks and see it rendered as sheet music via the abcjs library.
Embed bar, line, scatter, and other interactive data visualizations using a JSON spec in a fenced code block.
Use > [!NOTE], [!TIP], [!WARNING], and [!CAUTION] to create color-coded alert boxes, just like on GitHub.
Add inline references with [^1] syntax. Footnotes are rendered at the bottom of the document with automatic back-links.
Choose from 12 heading fonts, adjust per-level sizing, pick an accent color, and toggle dark mode. All preferences are saved locally.
Download your document as raw .md, a self-contained .html file with inlined fonts and syntax colors, or print to PDF with A4 margins and page breaks.
Frequently Asked Questions
Yes. EDTR.md is 100% free with no premium plans, no sign-up walls, and no feature limits. All features including PDF export, Mermaid diagrams, and KaTeX math are available at no cost.
No account is required. Open EDTR.md and start writing Markdown immediately. Your documents are stored in your browser's local storage, with no server and no registration.
Yes. Once loaded, EDTR.md works entirely offline using a service worker. Editing, live preview rendering, and file storage all happen in your browser without an internet connection.
EDTR.md supports GitHub Flavored Markdown (GFM), KaTeX math equations ($...$ and $$...$$), Mermaid diagrams (flowcharts, sequence, Gantt), Vega-Lite interactive charts, GitHub-style callout blocks (NOTE, TIP, WARNING, CAUTION), ABC music notation, footnotes with back-links, interactive task lists, subscript/superscript, text highlighting (==text==), heading alignment, and page breaks.
Yes. EDTR.md supports three export formats: raw .md files, self-contained .html files with inlined fonts and syntax highlighting colors, and print-to-PDF with A4 margins and page break support.
Your files never leave your browser. All data is stored in localStorage and no information is sent to any server. You have full ownership and complete privacy of your documents.
EDTR.md uses a split-pane layout where you write Markdown on the left and see the rendered HTML preview on the right. The preview updates on every keystroke with full syntax highlighting, math rendering, and diagram generation. No manual refresh needed.
Yes. EDTR.md supports GitHub file sync, allowing you to read and write Markdown files directly from your GitHub repositories.
No sign-up, no install, no data collection. Open the editor and start writing. Your documents never leave your browser.
Start writing