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DOC to DOCX Converter

Turn an old Word 97–2003 document into a modern DOCX that current software and upload forms accept.

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or drop files here

Accepts DOC

Encrypted upload. Files are deleted automatically after 1 hour.

About DOC to DOCX

DOC to DOCX conversion is for Word files from before 2007: old contracts, archived reports, templates that have been reused for years. Current Word versions open them in Compatibility Mode, and some upload forms and online tools accept only DOCX. Upload the .doc and download the same document in the newer format, named like the original with a .docx ending.

DOCX is Word's default format today and the one other word processors exchange with Word most easily. It's also what our other Word tools, such as Split Word, Compress Word and Protect Word, expect, so converting first opens the door to those. No Office installation is needed, and the conversion works the same way on a phone as on a desktop.

How to use DOC to DOCX

  1. 1
    Upload the DOC file

    Click Choose file or drop a .doc on the page. Free accounts can upload up to 50 MB, VIP up to 1 GB.

  2. 2
    Click DOC to DOCX

    The file is converted in an isolated process on our server.

  3. 3
    Download the DOCX

    Save it, and report.doc comes back as report.docx.

Why use Cubfile for this

  • Word's current format

    DOCX has been Word's default since 2007 and opens in every current version on Windows and Mac.

  • Ready for more tools

    Upload forms and editors that refuse DOC take the converted file, and so do our Word tools.

  • Same name, new ending

    The converted file keeps its name, so it's easy to match with the original.

  • No Office needed

    Convert on a Chromebook, a phone or any computer, with nothing to install.

FAQ

DOC to DOCX: questions and answers

What's the difference between DOC and DOCX?
DOC is the binary format Word used up to 2003. DOCX, introduced with Word 2007, stores the document as compressed XML and is Word's default format today.
Do I need Microsoft Word to convert DOC to DOCX?
No. The conversion runs on our server, so it works in any browser, including on a phone or a computer without Office.
Why convert DOC to DOCX at all?
Some upload forms, e-signature services and online editors accept only DOCX, and Word opens old files in Compatibility Mode, where some newer features are switched off.
Is this DOC to DOCX converter free, and how large can my file be?
Visitors get 2 tasks in total and free accounts 2 a day, for files up to 50 MB. VIP has no daily limit and a 1 GB file limit.
What happens to my document after conversion?
It's uploaded over HTTPS, converted in an isolated process and deleted, with the DOCX, one hour later. We never read or share it.
Share DOC to DOCX with a friendIt runs in any browser, and they can try it without signing up.

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MDDOCX Markdown to WordTurn Markdown into a styled Word document.
PAGESDOC Pages to WordTurn Apple Pages documents into editable Word files.
TXTDOCX TXT to WordTurn plain text into a formatted Word document, any encoding.
DOCXLS Word to ExcelPull every table in a Word file into Excel sheets.
DOCJPG Word to JPGSave every page of a Word document as an image.
DOCMD Word to MarkdownConvert headings, tables and lists in Word to Markdown.