Word to Word Converter
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Convert Word to Word online
Convert DOC to DOCX when an old Word file needs to open in modern Word, Google Docs, or LibreOffice without compatibility warnings, and you want the smaller, more widely supported format going forward.
When should you convert Word to Word?
- Modernize old .doc files for current Word versions
- Remove "compatibility mode" warnings when opening in Word
- Get a smaller file that works better with cloud editors like Google Docs
- Standardize a mixed batch of documents on one modern format
Before you convert
Formatting is preserved
Text, images, and layout carry over; DOCX simply stores the same document in a newer, more efficient format.
Keep a copy if you need DOC
Some very old software only opens .doc — keep the original if a legacy system still needs it.
What happens to your file
LibreOffice opens the DOC headlessly with its Writer filter and exports DOCX. Writer, Calc, and Impress each have their own permitted output set — LibreOffice will not convert across those categories, so the allowed targets here are Writer's.
Settings this conversion runs with
| Engine | LibreOffice headless (Writer) |
|---|---|
| Output | DOCX |
| Font handling | Missing fonts detected and substituted before rendering |
What changes
- If the document uses a font the server does not have, a substitution is picked before rendering — a close match, not the original. Line breaks and page counts can shift as a result, which is why it is worth opening an important file before sending it on.
- Right-to-left documents get an extra pass: justification is normalized before rendering so Arabic paragraphs do not come out stretched or misaligned, and a known-bad Arabic font is swapped for one the renderer handles correctly.
About Word and Word files
Word document
Strengths
- editable
- widely recognized
Limitations
- older format than DOCX
- larger files
Word document
Strengths
- fully editable
- rich formatting
- standard for office work
Limitations
- layout can shift between apps
- needs Word-compatible software
DOC vs DOCX
| Format | DOC | DOCX |
|---|---|---|
| Compression | — | — |
| Transparency | — | — |
| Best for | legacy Word documents, editable text | editable documents, reports and letters |
Guides for this conversion
- Why your converted document changed fonts
Document converters render on a server that does not have your fonts. Here is what substitution does to your layout, why Arabic and CJK documents are affected most, and how to avoid the surprise.
Related tools
Frequently asked questions
- How does the DOC to DOCX conversion work?
- LibreOffice opens the DOC headlessly with its Writer filter and exports DOCX. Writer, Calc, and Impress each have their own permitted output set — LibreOffice will not convert across those categories, so the allowed targets here are Writer's.
- What should you know before converting DOC to DOCX?
- If the document uses a font the server does not have, a substitution is picked before rendering — a close match, not the original. Line breaks and page counts can shift as a result, which is why it is worth opening an important file before sending it on.
- Is this DOC to DOCX converter free?
- Yes. You can convert DOC to DOCX online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. Use the converter from your browser without installing software or creating an account. Files are uploaded to our servers for processing.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.
- Can I convert multiple DOC files at once?
- Yes. Drop several files to convert them in a batch and download the results as a single ZIP.