DOC to DOCX Converter
Convert DOC to DOCX online for free. Use this converter when you need better editability, fixed-layout sharing, office compatibility, or a document format that fits your workflow better.
Converting DOC to DOCX re-encodes the document into the DOCX container. Text, headings, tables, images, and basic formatting are preserved; advanced features (macros, comments, tracked changes) may not carry across all format pairs.
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Checking files and selected output formats.
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What to expect when converting DOC to DOCX
A 500 KB legacy DOC typically becomes 250 – 400 KB as DOCX.
Quality: None for visual content. Some legacy features (specific macros, old WordArt) may not survive — DOCX is a stricter format.
Best for: modernizing legacy Word documents — DOCX opens cleanly in current Word, Google Docs, LibreOffice, and iOS Pages.
Avoid when: the recipient explicitly needs the old binary DOC format (rare today).
Tip: DOC was deprecated by Microsoft in 2007. Converting to DOCX is the right move for any Word doc you still need to maintain.
Convert DOC Documents in 3 Steps
Move a document into a more shareable or editable format while keeping layout, text structure, tables, and embedded media intact where possible.
Drag and drop your DOC file or click to browse. Supports text documents, reports, manuscripts, and files with images, tables, and formatting. Batch upload multiple files at once.
Our engine converts your DOC to DOCX while preserving text formatting, paragraph styles, images, tables, headers, footers, and page layout as faithfully as possible.
Download your converted DOCX document instantly. For batch conversions, download all files individually or as a single ZIP archive. No watermarks or quality loss.
Why Convert DOC to DOCX
DOCX files are fully editable in Microsoft Word, Google Docs, LibreOffice, and Apple Pages. Unlike PDF, every paragraph, image, table, and style can be freely modified after conversion.
DOCX supports revision tracking, inline comments, and suggested edits. Collaborative document workflows in teams, legal reviews, and academic peer review all depend on these editing features.
DOCX supports styles, headers, footers, page numbers, table of contents, footnotes, endnotes, and bibliography management. Create professionally formatted documents with consistent typography.
DOCX is the native format of Microsoft Word and integrates seamlessly with SharePoint, OneDrive, Teams, and the entire Microsoft 365 suite. Real-time co-authoring works best with DOCX files.
DOCX documents connect to data sources for mail merge operations, generating personalized letters, labels, envelopes, and certificates. Essential for mass communications and automated document generation.
DOC vs DOCX: Side-by-side
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | DOC | DOCX |
|---|---|---|
| Full name | Microsoft Word (legacy binary) | Microsoft Word (Open XML) |
| Year introduced | 1983 | 2007 |
| Developer / standard body | Microsoft | Microsoft |
| MIME type | application/msword | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| File extension | .doc | .docx |
| Compression | Compound File Binary Format | ZIP-compressed XML |
| Color / data depth | N/A (text) | N/A (text) |
| Max dimensions / size | 32 MB file size limit | 32 MB recommended |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | Microsoft (binary) | ECMA-376 / ISO/IEC 29500 |
| Best for | Legacy Word compatibility (1997–2003 era) | Modern Word documents, collaborative editing |
About the DOC Format
DOC is Microsoft Word's legacy binary document format, used as the default from Word 97 through Word 2003. Unlike the modern DOCX format which uses ZIP-compressed XML, DOC stores content in a proprietary binary structure called OLE2 (Object Linking and Embedding). While largely replaced by DOCX, millions of DOC files still exist in business archives, legal repositories, and government records.
DOC files support rich text formatting, embedded images, tables, headers, footers, and macros. However, they are larger than equivalent DOCX files, more prone to corruption, and harder for third-party software to parse correctly. Modern versions of Word, Google Docs, and LibreOffice can still open DOC files, but converting to DOCX or PDF is recommended for long-term compatibility and smaller file sizes.
DOC to DOCX FAQ
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert DOC files to DOCX.
How do I convert DOC to DOCX online?
Why would I convert DOC to DOCX?
Will converting DOC to DOCX keep formatting intact?
How will file size change when converting DOC to DOCX?
Can I batch convert multiple DOC files to DOCX?
Is it safe to convert DOC to DOCX online?
Why should I convert old DOC files to DOCX?
Will I lose any content converting DOC to DOCX?
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