Convert Markdown to HTML

Markdown is how READMEs, documentation, notes apps and many CMS editors store formatted text. When that text has to go somewhere that only understands HTML, such as an email template, a website without a Markdown plugin, a help-desk article or a newsletter tool, you need the HTML version. This converter shows a live preview next to your Markdown and gives you the HTML to copy, or a complete .html document to download.

GitHub Flavored Markdown is on by default: tables with column alignment, task lists with checkboxes, ~~strikethrough~~, fenced code blocks and bare links turning into links. You can also make single line breaks count as <br>, which suits text written in chat apps, and add target="_blank" to external links. The conversion uses marked (MIT), a widely used Markdown parser, loaded only when you start typing.

Markdown allows raw HTML, which is exactly how malicious content sneaks into converted text. Everything is therefore passed through DOMPurify (used here under its Apache-2.0 licence) before it is shown or copied: <script>, <iframe>, forms, inline styles and event-handler attributes such as onerror are removed, and javascript: links are stripped. The page tells you how many unsafe parts were dropped. Images on other websites are not loaded in the preview, so writing a draft never pings a third-party server; the HTML you copy keeps their addresses.