Markdown ⇄ HTML Converter
Real conversion in both directions — most tools only do Markdown to HTML well.
Also known as: Markdown to HTML converter, HTML to Markdown converter, MD to HTML converter
How it works
- 1Choose Markdown → HTML or HTML → Markdown.
- 2Paste your content, or click Try a sample.
- 3For Markdown input, toggle the live preview to see the rendered result.
- 4Copy or download the converted output.
Why use Markdown ⇄ HTML Converter
Genuine two-way conversion
HTML → Markdown is implemented properly using the browser's real HTML parser, not just Markdown → HTML like most free tools.
Covers real-world Markdown syntax
Headings, bold/italic, code blocks with language tags, links, images, lists, blockquotes, and tables are all supported.
Safe sandboxed preview
The live HTML preview renders inside a fully sandboxed iframe with script execution disabled entirely.
Automatic HTML escaping
Literal angle brackets and script-like text in your Markdown are escaped and shown as visible text, never executed.
One tool, either direction
No need to hunt for a separate tool depending on which way you're converting.
Nothing transmitted
Both directions convert entirely in your browser — your content is never uploaded.
Who uses Markdown ⇄ HTML Converter
Publishing Markdown notes as a web page
Convert Markdown documentation or notes into HTML ready to paste into a CMS or static site.
Turning a copied web snippet into Markdown
Paste HTML copied from a web page and get clean Markdown source suitable for a README or wiki.
Cleaning up exported HTML
Convert HTML exported from a word processor or note-taking app into portable, version-control-friendly Markdown.
Previewing Markdown before publishing
Use the live sandboxed preview to check formatting before committing content to a README or blog post.
Building email or newsletter content
Write in Markdown for simplicity, then convert to HTML for pasting into an email or newsletter tool.
Migrating content between platforms
Move content between a Markdown-based wiki and an HTML-based CMS in either direction.
About Markdown ⇄ HTML Converter
Most "Markdown converter" tools online only really do one direction: Markdown to HTML, which is the easier of the two since Markdown's syntax is small and well-defined. Going the other way — HTML back to Markdown — requires actually parsing arbitrary HTML structure and deciding how to represent it in Markdown, which is why far fewer tools attempt it, and even fewer do it cleanly. This tool does both, using the browser's native DOMParser to properly parse HTML (rather than approximating it with regular expressions) before converting it back to Markdown.
The Markdown-to-HTML direction covers the syntax people actually use day to day: headings, bold and italic text, inline code, fenced code blocks with language tags, links, images, ordered and unordered lists, blockquotes, horizontal rules, and GitHub-flavored pipe tables. All text content is HTML-escaped before any formatting is applied, so a literal `<script>` or `<div>` typed into your Markdown renders as visible text in the output, not as executable markup.
The rendered HTML preview runs inside a fully sandboxed iframe with no script execution permitted at all — so even pasted content that somehow contained executable markup couldn't run anything, by design, not by careful escaping alone.
Everything — both parsing directions and the preview render — happens entirely in your browser. No content you paste in is ever transmitted anywhere, which matters as much for a quick personal note as it does for a confidential internal document.
Markdown ⇄ HTML Converter vs. other options
How Open Tools Library compares to desktop software and other online tools.
| Feature | Open Tools Library | Desktop software | Other online tools |
|---|---|---|---|
| Price | Free, unlimited | Often paid editors | Often free, one direction only |
| Content privacy | Never leaves your device | Stays local | Often uploaded to a server |
| HTML → Markdown support | Full support, real HTML parser | Varies | Rarely offered |
| Preview safety | Fully sandboxed, no script execution | N/A | Varies, often unsandboxed |
| Table support | GitHub-flavored pipe tables | Varies | Often unsupported |
| Installation | None | Required | None |
Pro tips
- GitHub-flavored pipe tables need a separator row (| --- | --- |) directly under the header row to be recognized.
- The HTML → Markdown direction reads actual HTML structure via the browser's parser, so malformed or unusual HTML may convert imperfectly — well-formed HTML converts most reliably.
- Nested formatting (like a link inside bold text) is supported, but very deeply nested or unusual combinations may not round-trip perfectly in both directions.
- The sandboxed preview intentionally can't execute scripts or load external resources — that's a safety feature, not a bug, if a preview looks inert.
Technical specs
- Markdown syntax covered
- Headings, bold/italic, code, links, images, lists, blockquotes, tables, hr
- HTML parsing engine
- Native browser DOMParser
- Preview sandboxing
- iframe with all script execution disabled
- Text safety
- All Markdown text content is HTML-escaped before formatting is applied
- Table format
- GitHub-flavored pipe tables
- Processing location
- 100% local, in your browser
Privacy & security
Markdown notes and copied HTML often contain drafts, internal documentation, or unpublished content — conversion shouldn't require handing that to a server.
Every conversion — including the live preview — runs entirely in your browser.
No account, no email, no login — just content in, converted content out.
The preview is sandboxed with all script execution disabled, so nothing you paste can run code.
Nothing is retained after you close the tab; there's no copy waiting on a remote server.
Frequently asked questions
Is my content uploaded anywhere?
No. Both conversion directions run entirely in your browser — nothing is ever transmitted.
Does this really convert HTML back to Markdown, not just Markdown to HTML?
Yes — both directions are fully implemented, with HTML parsed using the browser's real DOMParser rather than approximated with regular expressions.
Is the live preview safe to use with content I don't fully trust?
Yes — the preview renders inside a sandboxed iframe with all script execution disabled, so nothing in the preview can run code regardless of the source content.
What Markdown syntax is supported?
Headings, bold, italic, inline code, fenced code blocks, links, images, ordered and unordered lists, blockquotes, horizontal rules, and GitHub-flavored tables.
Can I convert a full HTML document, not just a snippet?
Yes — paste the full document and the body content will be walked and converted; head/meta content isn't represented in Markdown output, since Markdown has no equivalent.
Troubleshooting
My table didn't convert correctly
Pipe tables need a separator row directly under the header, like | --- | --- | — without it, the table is treated as a regular paragraph.
HTML → Markdown dropped some formatting
Only the tags this converter recognizes (headings, paragraphs, bold/italic, code, links, images, lists, blockquotes, tables, hr) are converted — unrecognized tags have their text content preserved but their specific formatting isn't represented in Markdown.
The preview looks blank or inert
This is expected for content that relies on scripts or external resources — the preview is intentionally sandboxed and can't execute or load either.
Angle brackets in my Markdown show up as text instead of formatting
That's by design — literal HTML-like text in your Markdown source is escaped and shown as visible text, not executed as markup.
Related searches
Landed here looking for something worded a little differently? Markdown ⇄ HTML Converter covers all of these too:
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