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Markdown to HTML Converter

Convert Markdown to HTML in your browser. Raw HTML in the source is sanitised by default, so a paste of script tags does not survive the conversion.

Paste Markdown

HTML result

Paste Markdown, then convert.

The HTML appears here. Preview it below before you use it.

Limit for uploaded files: 2 MB. Pasted text is not truncated by the tool — your browser’s memory is the ceiling.

Your file is never sent to a server. It is read and processed by your own browser, and the results are not stored.

How to use it

  1. Paste Markdown, or choose a .md file.
  2. Leave sanitisation on unless you know the source is fully trusted.
  3. Preview the result; download the HTML or copy it to your clipboard.

Limits worth knowing

  • Sanitisation removes scripts, event handlers and javascript: URLs — it is on by default.
  • Complex raw HTML inside Markdown is preserved structurally, not exactly as typed.
  • The preview is sandboxed and does not execute the converted page’s scripts.
  • Files above 2 MB are refused to keep the tab responsive.

Markdown is not HTML — and vice versa

Markdown is a writing format with a handful of conventions; HTML is the document that browsers render. Converting is mostly mechanical for headings, lists and links, but raw HTML inside a Markdown file is where surprises live, which is why sanitisation is on unless you turn it off.

The preview shows what the conversion produced, not what your editor intended — if something looks wrong, the Markdown is wrong, not the renderer.

What sanitisation removes

DOMPurify strips script tags, inline event handlers and javascript: URLs. It does not rewrite your words. Legitimate raw HTML (tables, details elements) passes through unchanged.

Frequently asked questions

Does Markdown to HTML Converter upload my files to any server?

No. Markdown to HTML Converter runs in your browser, and the file is read there rather than sent to a server for processing. Our host still sees ordinary page-request metadata, which is described on the privacy page.

Is Markdown to HTML Converter free to use?

Yes, Markdown to HTML Converter is free, with no paid tier, no account, and no watermark added to your output. The limits are technical rather than commercial: file size, page count and supported formats are listed on this page.

What file formats and sizes are supported?

Markdown to HTML Converter supports .md, .markdown, .txt files up to 2MB directly in your browser.

Does it strip raw HTML from my Markdown?

By default, yes: everything passes through DOMPurify, which removes scripts, event handlers and javascript: URLs. You can switch sanitisation off — the tool warns you before doing so.

Which Markdown does it support?

GitHub-flavoured Markdown via marked: headings, lists, tables, task lists, fenced code blocks, strikethrough, links and images. Breaks are not treated as hard line breaks by default.

Is the preview safe to show inside the page?

Yes. The preview renders in a sandboxed iframe with no scripts or same-origin access, and it always shows the sanitised output.

Is my Markdown uploaded?

No. Conversion runs in this tab; the preview iframe is sandboxed and reads no cookies or storage.