DOC to DOCX converter
Convert DOC files to DOCX with TLS uploads and automatic deletion. Microsoft Word's XML-based document format.
Drop a DOC file, or click to browse
Converts to DOCX · runs live, right now
How it works
Drop your file
Drag a DOC file in, or click to browse. No account needed to try it.
We convert it
Secure upload, converted to DOCX in our office pipeline.
Download the result
Grab your DOCX file immediately, or find it later in your dashboard.
Why convert DOC to DOCX?
Both DOC and DOCX use no compression scheme of its own, so the conversion mainly changes compatibility, not quality. The main reason to convert DOC to DOCX is compatibility: DOCX readable on virtually any device, with or without the original app installed, while DOC doesn't always. If you're sharing a file with someone else, sending it to a tool that expects a specific format, or archiving it for the long term, DOCX is usually the safer target.
Format comparison
| DOC | DOCX | |
|---|---|---|
| Extension | .doc | .docx |
| MIME type | application/msword | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Compression | no compression scheme of its own | no compression scheme of its own |
| Category | document | document |
Common reasons to convert DOC to DOCX
- Sending a file to someone who doesn't have DOC's original app installed
- Submitting to a system — a job application, a government form, a print shop — that requires DOCX specifically
- Maximizing compatibility with older or stricter tools that expect an uncompressed DOCX file
What actually happens to your file
This conversion runs through LibreOffice Writer (`soffice --headless --convert-to docx`), not Pandoc. Legacy .doc is a binary OLE format LibreOffice still reads; the output is a real Office Open XML .docx. Macros, some embedded objects, and Word-specific layout quirks can change, so a round-trip isn't guaranteed to be pixel-identical.
Your file, handled carefully
Uploads use TLS in transit and AES-256 SSE-S3 at rest in production (when the production S3 credential gate is enabled), are processed in an isolated job, and deleted on the schedule you choose — as fast as immediately. We don't index, search, or share files between accounts. Read the full security model →
Frequently asked questions
Is converting DOC to DOCX free?
Yes — the Free plan includes 50 conversions every month, including DOC to DOCX. Paid plans raise that limit.
Will I lose quality converting DOC to DOCX?
DOCX is microsoft word's xml-based document format. We use the highest-quality encoder settings by default so visual or data loss is minimized.
Do you keep a copy of my file?
Files are deleted automatically based on your plan's retention options. Free accounts can keep results for 1h or 24h; Pro and above add options such as delete-immediately and 7 days.
What is DOC?
Legacy binary Word document format.
What happens if a conversion fails?
You get a clear error message and the job is marked failed in your history — we never silently drop a file. Retry is one click. Monthly quotas count attempts (including failures) because processing starts as soon as the job is created.