Live split-pane preview
Editor and preview side by side. Every keystroke renders instantly -no save, no refresh.
# Hello
**world**
Hello
world
Write, preview, and export Markdown -all in your browser. Live preview, diagrams, math, music notation, dark mode, and PDF export.
# Welcome to edtrmd
A **modern** markdown editor
## Features
- [x] Live preview
- [x] Syntax highlighting
- [ ] Take over the world
$E = mc^2$
A modern markdown editor
Features
A complete writing environment with live preview, rich extensions, and zero setup.
Editor and preview side by side. Every keystroke renders instantly -no save, no refresh.
CodeMirror editor + highlight.js preview. 100+ languages, GitHub colors.
Flowcharts, sequence diagrams, Gantt charts -plain text syntax, rendered inline.
Inline $...$ and block $$...$$ equations rendered by KaTeX.
GitHub-inspired dark theme. One click toggle -syntax colors, diagrams, and scrollbars all adapt.
GFM task lists become real checkboxes. Click to toggle -source updates automatically.
ABC notation in fenced code blocks renders as sheet music via abcjs.
Download as .md or self-contained .html with inlined fonts. Print to PDF with A4 margins and page break support.
12 heading fonts, per-level sizing, accent color, and dark mode -all saved to your browser.
How it works
Click "Start writing" -no account, no install, no config.
Type Markdown on the left. See the rendered preview on the right, live.
Download as .md, .html, or print to PDF. Your files never leave your browser.
FAQ
Yes -edtrmd is 100% free and open source. There are no premium plans, no sign-up walls, and no feature limits.
No. Just open the editor and start writing. Your files are stored in your browser's local storage -no server, no account.
Yes. Once loaded, edtrmd works entirely offline. All editing, preview rendering, and file storage happen in your browser.
edtrmd supports GitHub Flavored Markdown, KaTeX math ($...$ and $$...$$), Mermaid diagrams, ABC music notation, task lists, highlight (==text==), heading alignment, spacer blocks, and page breaks.
Yes. You can download as raw .md, as a self-contained .html file with inlined fonts and syntax colors, or print directly to PDF with A4 margins and page break support.
Your files never leave your browser. Everything is saved to localStorage -no data is sent to any server. You own your data completely.
No sign-up. No install. Your documents stay in your browser, always.
Start writing -it's free