Convert DOC to DOCX — Free & Private
Transform your DOC files to DOCX format instantly. 100% private, works on any device.
Loading converter...
About DOC to DOCX Conversion
Transform your documents for maximum compatibility. Whether you're switching between Office formats, converting to universal PDF, or adapting files for specific software, our converter handles the complexity.
How to Convert DOC to DOCX
Converting files has never been easier or more secure. MixConvert uses advanced browser-based technology to process your files instantly without uploading them to a remote server. Follow these simple steps to get started:
- Select Your Files: Select your DOC files by clicking the upload zone or dragging them directly onto the page.
- Choose Output Format: Confirm DOCX is set as the destination format in the format selector.
- Convert Instantly: Click the convert button to begin. Your DOC files will be processed locally in seconds.
- Download: Save your new DOCX files directly to your device. Batch download available for multiple files.
DOC to DOCX FAQ
Can I convert DOC to DOCX on mobile devices?
Absolutely! Our converter is fully responsive and works on any smartphone or tablet. Just visit this page, upload your DOC files, and convert them to DOCX format—no app required.
Is my data secure when converting DOC files?
100% secure. Unlike cloud converters, MixConvert processes your DOC files entirely on your device using WebAssembly. Your data stays on your computer—we never see it.
How large can my DOC files be?
We don't impose file size restrictions. Your browser handles the conversion, so the limit depends on your device's memory. Typical computers can process very large DOC files without issues.
What's the conversion speed for DOC files?
Conversion is nearly instant for typical DOC files. Your device's processor handles the work, so faster devices complete DOCX conversion more quickly.
Does MixConvert support converting multiple DOC files at once?
Batch conversion is fully supported. Upload as many DOC files as you need and convert them all to DOCX in one go. A ZIP download option makes it easy to save everything.
e
e
Understanding the Formats
DOC
Microsoft Word 97-2003
Legacy Word format. Still widely used for compatibility with older systems.
DOCX
Microsoft Word Document
Microsoft Word's modern document format. Editable and widely supported by word processors.
Reverse Conversion
DOCXDOCMore DOC Conversions
Convert DOC to other formats
More Ways to Get DOCX
Convert other formats to DOCX