# Markdown Editor — Free Online Tool
https://markdown.usetool.org/

> Markdown Editor is a free, privacy-first online tool for writing and previewing Markdown with live split-view. Includes toolbar, syntax highlighting, and export to HTML. No signup, no ads, no server processing — everything runs in your browser.

## Features
- Live split-view: write Markdown on the left, see rendered HTML on the right
- Formatting toolbar: bold, italic, headings, links, images, lists, code blocks, tables
- Syntax highlighting in the editor
- Export rendered HTML to clipboard or file
- GitHub Flavored Markdown (GFM) support: tables, task lists, strikethrough, autolinks
- Auto-save to browser local storage
- Dark mode support
- Mobile responsive design
- Works offline after first load

## Supported Markdown Syntax
Headings (h1-h6), bold, italic, strikethrough, links, images, ordered/unordered lists, task lists, blockquotes, inline code, fenced code blocks with language highlighting, tables, horizontal rules, footnotes.

## Use Cases
Developers writing README files, technical writers creating documentation, bloggers drafting posts, students formatting notes, anyone who needs to write Markdown without installing an editor.

## Limitations
No file import/export (Markdown files). No collaborative editing. No custom CSS themes for preview. No diagram rendering (use mermaid.usetool.org for diagrams). No API — all processing is client-side in the browser.

## Technical
Built with Astro 5 (static site generator), Preact + Signals, Tailwind CSS. Uses marked.js for Markdown parsing and highlight.js for syntax highlighting. Text never leaves the browser. Part of the UseTool suite at usetool.org.