Markdown Editor & Preview

Markdown is a lightweight markup language created by John Gruber in 2004, designed to be readable as plain text while converting cleanly to HTML. Its simplicity has made it the standard format for technical writing, documentation, README files, blog posts, and note-taking. The syntax is intuitive: hash symbols create headings (# for H1, ## for H2), asterisks create bold (**bold**) and italic (*italic*) text, hyphens and numbers create unordered and ordered lists, backticks create inline code and code blocks, brackets and parentheses create links ([text](url)), and exclamation marks add images (). GitHub Flavored Markdown (GFM) extends the spec with tables, task lists (- [ ] unchecked, - [x] checked), strikethrough (~~text~~), and syntax-highlighted code blocks with language identifiers. Markdown files are plain text — they work in any text editor, version control system, and content platform. The AllTools Markdown Editor provides a split-pane interface with live preview, rendering your Markdown to formatted HTML as you type. The editor includes a toolbar for common formatting operations, and the content exists only in your browser — drafts of documentation, blog posts, or private notes never leave your device.

Markdown has been adopted across virtually every modern content and development platform, though with platform-specific extensions and variations. GitHub renders Markdown in README files, issues, pull requests, wikis, and discussions — GFM tables, task lists, and emoji shortcuts (:rocket:) are GitHub-specific extensions. Notion uses a Markdown-like editor for its blocks, supporting most standard syntax with its own block-based model. Obsidian and Logseq use Markdown for local knowledge management, adding wiki-style links ([[note name]]) for networked note-taking. Static site generators like Jekyll, Hugo, and Astro convert Markdown files to HTML web pages during build. Ghost, WordPress (with plugins), and many other CMS platforms accept Markdown for post content. Slack and Discord support a subset of Markdown for message formatting. Jupyter notebooks use Markdown in text cells for documentation alongside code cells. The AllTools Markdown Editor renders standard CommonMark specification Markdown with GFM extensions using the marked.js library in the browser. The preview shows exactly how your Markdown will render on most major platforms, helping you write content that looks correct wherever it's published.