Markdown flavours are not interchangeable

A file marked up for Notion or GitHub or Obsidian often assumes syntax that this editor does not support. Task lists like - [ ] Incomplete, pipe-table markdown, footnotes like [^1], and LaTeX math all render in their native environments but produce plain text here. This editor implements CommonMark with additions: strikethrough ~~deleted~~, inline code, and fenced code blocks with language tags. When pasting markdown from elsewhere, verify the syntax appears in the preview.

Your draft lives in your browser, not on a server

The editor auto-saves to your browser's localStorage 500 milliseconds after you stop typing. The save timestamp appears in the interface. No account or login is needed, and your draft reloads when you return to this page — but only on this device and browser. localStorage is not synced across devices and is lost if you clear your browser data.

The preview enforces strict CommonMark rendering

Side-by-side preview means you see immediately what markdown actually produces. Unsupported syntax such as a raw <div> renders as escaped text, not as HTML. The preview uses the same renderer as your export, so there are no surprises between what you see and what the .md file contains.

What is supported, and what is not

Download your markdown as a .md file or copy the raw text to clipboard. The editor counts words as you type. Supported syntax includes headers, bold, italic, strikethrough, links, images, blockquotes, unordered and ordered lists, fenced code blocks with language tags, and horizontal rules. Nested lists, tables, task lists, footnotes, and mermaid diagrams are not. For structured data rather than prose, see the JSON Formatter or the Regex Tester.