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Markdown to HTML

Turn Markdown into HTML source without previewing untrusted markup.

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

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What this tool does

marked converts GFM Markdown to HTML. ConvertPass shows the HTML in an output pane. There is no live preview, on purpose.

How to use it

  1. Paste Markdown.
  2. Copy the HTML source.
  3. Render it in your own site after sanitising if the Markdown is untrusted.

Supported input

  • Markdown text, UTF-8, up to 2 MB

Output

  • HTML source

Privacy

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: UTF-8. Limit: 2 MB (2.00 MB).

Limitations

  • No live HTML preview.
  • Raw HTML inside Markdown is passed through by marked and still must not be trusted.
  • This is not CommonMark-certified; treat edge cases as implementation-defined.

Example

Input
## Local tools

ConvertPass runs **in the browser**.
Output
<h2>Local tools</h2>
<p>ConvertPass runs <strong>in the browser</strong>.</p>

Troubleshooting

A table did not convert
Use GFM table syntax with a header separator row. Indented tables can be parsed as code.

FAQ

Why is there no preview?

Previewing HTML from user Markdown is a classic XSS path. Showing source is enough for a converter and much safer.

Is this GitHub flavoured?

GFM tables, strikethrough, and autolinks are enabled. GitHub's exact sanitiser is not cloned.

Will front matter work?

YAML front matter is not stripped. Remove it first or it will appear as text.

Can I convert a whole docs folder?

One document at a time in this version.

Related tools

Related guides

Related formats

Last reviewed 16 August 2026. Report a problem. Reports do not include your input.