Convert DOCX to HTML
Mammoth reads the document’s structure rather than its appearance, so you get real headings and lists instead of a wall of styled spans. That is exactly what you want when the HTML is going into a CMS.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Drop a .docx file.
- Pick HTML as the output.
- Copy the markup or download the file; a preview is shown underneath.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see are the tool’s own code and, once cached, none at all.
Frequently asked questions
Why is the Word formatting gone?
On purpose. Word stores fonts, sizes and colours per run of text; carried into HTML that produces unusable markup. Mammoth maps Word’s *styles* (Heading 1, List Bullet, Quote) to real HTML elements and drops the rest, which is what makes the result publishable.
What happens to the images?
They are embedded inline as data URIs, so the HTML is a single self-contained file. Large documents therefore produce large HTML — extract the images afterwards if that matters.
Is my document uploaded?
No. It is parsed and converted inside this browser tab. Load the page, disconnect, and it still works — which is the only guarantee worth having for a contract or a customer list.