Markdown Preview
Type Markdown on the left. See it rendered on the right. Revolutionary.
What this does
Type or paste Markdown on the left. See it rendered on the right. Updates live as you type. Headers, bold, italic, links, images, code blocks, lists, blockquotes, horizontal rules, tables. The full Markdown spec plus GitHub Flavored Markdown extensions, because that's what most people actually mean when they say "Markdown."
Quick syntax refresher if you need it. # through ###### for headers. **bold** and *italic* for emphasis. [link text](url) for links,  for images. Wrap code in backticks for inline, triple backticks for blocks (add a language name after the opening backticks for syntax highlighting). Lists start with - or 1. and you need a blank line before them or they won't render. That blank line thing trips up everyone at least once.
The Copy HTML button grabs the rendered output as clean HTML markup. Paste it into a blog CMS, an email builder, a static site template, wherever HTML is welcome. It's the actual rendered HTML, not the raw Markdown, so you get properly nested tags ready to use.
This is genuinely useful for previewing README files before you push them. GitHub's preview works, but it requires committing first (or using their web editor, which is fine until you need to preview something longer than a paragraph). Write your README here, check the formatting, then copy it back. Same goes for blog drafts, documentation pages, or any content destined for a Markdown-based system.
GFM support means you get strikethrough with ~~double tildes~~, task lists with - [ ] and - [x], and pipe tables. Tables are Markdown's least ergonomic feature, but they render correctly here and that's about the best anyone can promise.
Common mistakes that'll make your Markdown look wrong: forgetting the blank line before a list (the parser needs it), not indenting nested list items enough, putting spaces inside link brackets, and using single backticks when you meant triple. If your output looks weird, check those first.
Everything renders locally in your browser. Your writing stays on your machine. No server, no accounts, no "sign up to preview more than 500 words" nonsense. Write your novel in Markdown if you want. We literally can't read it.