Written by Sam Taylor — Full-Stack Developer. I convert between formats so often I built a tool for it. More about me →
I write everything in Markdown—documentation, blog posts, internal dev notes. But sooner or later, someone wants HTML. The marketing team needs it for the CMS. The design system wants it for the component library. The client wants to "just see it in a browser." So you convert. And if you pick the wrong tool, your code blocks come back as escaped gibberish and your tables lose a column.
I've tested a half-dozen Markdown-to-HTML converters across three real-world projects. Here's which ones actually preserve your formatting.
For quick conversions—a single README, a blog draft, a one-off—I reach for a browser-based converter. No install, no CLI, no dependencies. Paste your Markdown on the left, get clean HTML on the right. The Formly Markdown converter handles all the edge cases I care about: fenced code blocks with language tags, nested lists, GFM tables, and footnotes. Everything runs in the browser—your content never touches a server.
I prefer this over online converters that send your text to their backend. If you're converting internal documentation that might contain API endpoints or project structure, a browser-local tool is the only responsible choice.
npx marked input.md -o output.html
marked is the fastest CLI option and handles GFM (GitHub Flavored Markdown) out of the box. For Python projects, python -m markdown input.md with the extra extension enabled covers tables and code fences. Both are free, both are fast, both output clean HTML.
The CLI approach shines when you're converting batches of Markdown files—a docs folder, a blog pipeline, a static site build. Write a three-line shell script and wire it into your CI.
Cheap converters tend to fail on the same things: triple-backtick code fences get treated as inline code, pipe characters inside table cells break the entire table structure, and nested lists collapse into flat bullet points. I recommend testing any new converter with a stress-test Markdown file that includes all three of these patterns. If it survives, you're good.
Written by Sam Taylor — Full-Stack Developer. I convert between formats so often I built a tool for it. More about me →