Markdown Tool

Markdown's appeal is that it reads like plain text and still carries structure — a README, a comment, a changelog entry all stay legible in their raw form. This tool renders that structure both ways: Markdown to the HTML a browser actually displays, and HTML back to Markdown for pulling formatted content — a blog post, a changelog, documentation — into a form that is comfortable to edit as text.

The preview matters more than it might seem. Rendering someone else's Markdown means rendering HTML you did not write, and a naive preview that injects that HTML straight into the page is a real cross-site-scripting opening — a stray <script> tag in pasted Markdown would simply run. This preview instead renders inside a sandboxed iframe with scripts disabled, so nothing pasted here can execute against this page no matter what it contains.

Converting the other direction, from HTML to Markdown, keeps headings, lists, links, emphasis, tables and code blocks, and deliberately drops what Markdown has no equivalent for — inline styles, layout divs, tracking attributes. That is usually exactly what you want when the goal is pulling the content out of a page, not its formatting.