Markdown to HTML Converter

Local-first

Convert Markdown headings, lists, links, code blocks, and tables into HTML.

How this tool actually works

This lightweight converter recognizes a limited Markdown subset with regular-expression and line-based rules. It is not a complete CommonMark parser, and the generated HTML is not sanitized for direct insertion into a trusted page.

Convert basic headings and unordered lists
Handle simple emphasis, links, and code
Convert one simple pipe table

How to use it

Paste controlled Markdown using the supported basic syntax.
Convert and compare content before and after any table or code fence.
Review every generated link and reject unsafe protocols.
Sanitize the HTML with an appropriate library before rendering untrusted input.

Quick example

Example input

# Release notes

- Fixed parser
- Added `export`

[Docs](https://example.com)

Expected result

<h1>Release notes</h1>
<ul><li>Fixed parser</li><li>Added <code>export</code></li></ul>
<p><a href="https://example.com">Docs</a></p>

Ordered and nested lists, blockquotes, images, references, escapes, and other CommonMark features are not fully supported. This remains a documented subset rather than a full parser.

Best use cases

Convert a controlled basic Markdown snippet.
Create draft HTML for documentation review.
Inspect simple headings, lists, code, links, and tables.

References and scope

CommonMark and GFM define substantially more syntax than this line-based converter. The output should be treated as a draft from a documented subset.

CommonMark Specification - CommonMark
GitHub Flavored Markdown Specification - GitHub
WHATWG HTML links - WHATWG

Sources checked July 24, 2026. Specifications and platform behavior can change; verify the sources before formal use.

Known limitations

Only HTTP, HTTPS, mailto, root-relative, and fragment links are emitted; other schemes become plain label text.
An unclosed fenced code block is rejected instead of silently dropping content.
Parsing resumes after contiguous table rows.

FAQ

Is this a full CommonMark parser?

No. It implements only a small subset of common Markdown syntax.

Which link schemes are emitted?

HTTP, HTTPS, mailto, root-relative, and fragment links; unsupported schemes become plain text.

Are ordered lists supported?

No. The current list handler is for simple unordered lists.

Is text after a table preserved?

Yes. Parsing continues after the contiguous table rows.