Convert DOC to DOCX Online
Binary format makes files opaque to non-Microsoft tools and prone to corruption on partial writes. Converting to DOCX gives you a key advantage: open xml zip-based structure allows programmatic manipulation and ensures cross-platform interoperability. DOCX is best for collaborative document editing with tracked changes, comments, and style-based formatting.
Why Convert DOC to DOCX?
Binary format makes files opaque to non-Microsoft tools and prone to corruption on partial writes — converting to DOCX overcomes this by providing open xml zip-based structure allows programmatic manipulation and ensures cross-platform interoperability
DOCX is the right choice when you need to: writing proposals and reports with team review via tracked changes
Gain broader compatibility — DOCX works with Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages, WPS Office, and OnlyOffice
Your DOC files were created for maintaining compatibility with legacy enterprise document management systems, but now you need a format suited to different workflows
DOC vs DOCX — Format Comparison
Microsoft Word Binary Document (.doc)
Microsoft Word Open XML Document (.docx)
How to Convert DOC to DOCX
Upload your DOC file
Drag your .doc file onto the upload area or click to browse. We accept DOC files up to 100 MB.
Choose DOCX as output format
Select .docx (Microsoft Word Open XML Document) from the format list. Configure any format-specific settings to match your requirements.
Convert and download
Click Convert and wait for processing. Your DOCX file will be ready to download in seconds. The result is optimized for collaborative document editing with tracked changes, comments, and style-based formatting.
Frequently Asked Questions
Is the DOC to DOCX conversion lossless?
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When both formats support lossless data, the conversion preserves all content. Rich formatting with styles, themes, tracked changes, headers/footers, and embedded media.
How large will my DOCX file be compared to the original DOC?
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DOC files are typically 50 KB – 20 MB, while DOCX files are typically 20 KB – 30 MB. The actual size depends on content complexity and any quality settings you choose.
What software can open the converted DOCX file?
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DOCX is compatible with: Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages, WPS Office, and OnlyOffice.
What is the maximum file size I can convert?
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PureConverter accepts DOC files up to 100 MB. Your files are processed securely and deleted from our servers after conversion.
What's the difference between DOC and DOCX?
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DOC (Microsoft Word Binary Document) is best for opening and editing legacy word documents created before the 2007 office xml transition. DOCX (Microsoft Word Open XML Document) is best for collaborative document editing with tracked changes, comments, and style-based formatting. Key tradeoff: DOC's advantage is universal recognition by every version of microsoft word ever released, including office 97, while DOCX's advantage is open xml zip-based structure allows programmatic manipulation and ensures cross-platform interoperability.
Pro Tips for DOC to DOCX Conversion
Review the output DOCX file to ensure all formatting and content transferred correctly from your DOC source
Complex formatting (tables, columns, headers) converts most accurately when the original DOC file uses standard styles rather than manual spacing
DOCX works especially well for: building structured documents with automatic table of contents and cross-references
Did you know? A DOCX file is actually a ZIP archive — rename it to .zip and you can browse its XML parts, images, and style sheets directly.
Ready to Convert?
Upload your DOC file above and get your DOCX in seconds. Free, fast, and secure.