How to use Markdown ↔ HTML
Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.
- Paste or type your input in the
INPUTpanel - The output regenerates automatically as you type
- Use
Copyto put the result in your clipboard - Click
Sampleto load a working example
What is Markdown ↔ HTML?
Markdown ↔ HTML is a bidirectional converter using `marked` for MD→HTML (with GitHub-flavored Markdown extensions: tables, strikethrough, autolinks) and `turndown` for HTML→MD. MD→HTML output is sanitized with DOMPurify to remove script tags, event handlers, and other XSS vectors before display. Both directions run entirely in the browser; nothing is uploaded. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.
Common use cases
- Debugging API payloads and integration issues
- Inspecting tokens, hashes, or encoded strings during development
- Generating fixtures and sample data for tests
- Sharing readable output with teammates in code reviews
FAQ
Yes. Output is passed through DOMPurify which removes scripts, event handlers, and other XSS vectors before display.
CommonMark + GitHub-flavored extensions (GFM): tables, strikethrough, task lists, autolinks, fenced code blocks.
Common elements (headings, lists, links, code) round-trip cleanly. Inline styles, custom classes, and complex tables may simplify.
Yes, but expect minor formatting normalization (e.g., heading style atx → atx, list markers normalized to `-`).
Yes, in the HTML output. Standard `<img>` and `<a>` tags pass through DOMPurify. URLs are not auto-fetched.