File Formats
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Differences Between DOC and DOCX Formats
Detailed comparison of DOC and DOCX Word formats, and which one you should use for compatibility and features.
DOC and DOCX are both Microsoft Word formats, but they are very different in structure and capabilities.
DOC - Legacy format (1983-2007)
- Binary format
- Older, less efficient
- Larger file size
- Less secure
- Compatible with Word 97-2003
DOCX - Modern format (2007+)
- XML-based (Office Open XML)
- Smaller file size (up to 75% smaller)
- Better data recovery
- More secure
- Supports modern features
- Compatible with Word 2007+
Which should you use?
Always use DOCX unless you need to open the file in Word 2003 or older. If you need to convert, use our DOC to DOCX Converter.
Conversion considerations
- DOC to DOCX is usually lossless
- Some legacy features may not translate
- Always keep a backup of the original DOC
Ready to convert your file?
Use our DOC to DOCX tool for free, no registration required.
DOC to DOCX