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DOC to DOCX Converter

Rebuild a mislabelled or malformed .doc as a clean, modern .docx.

DOC to DOCX Converter reads your .docx in the browser — the format is a ZIP of XML, so its headings, paragraphs, lists and tables can be parsed directly on your own device — and writes the converted result. Nothing is uploaded, which is the point when the document is a contract, an HR file or a medical letter.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

It says my file is a real binary .doc and refuses.

Then it genuinely is the pre-2007 OLE compound format, which cannot be read by any browser. Every site that claims to convert it uploads your file to a server running Word or LibreOffice. Opening it locally and choosing Save As → .docx takes seconds and keeps the document on your machine.

So what does this tool actually fix?

Files that are Office Open XML but carry a .doc extension — extremely common from email gateways and older document systems — and .docx files with damaged internal structure. Both are rebuilt into a clean document.

How to use the doc to docx converter

  1. 1Select your word document — the file stays on your device and is never uploaded.
  2. 2Press Run, then download the result when it is ready.

Embed this tool

Put the working doc to docx converter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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