DOC to DOCX converter
Convert DOC files to DOCX with encrypted uploads and automatic deletion. Microsoft Word's XML-based document format.
DOC → DOCX is queued for rollout
Image, spreadsheet, document and media conversions are live today. This pair needs our office engine, which is next on the roadmap.
How it works
Drop your file
Drag a DOC file in, or click to browse. No account needed to try it.
We convert it
Encrypted 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 |
Your file, handled carefully
Uploads are encrypted in transit and at rest, 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 first 50 conversions every month are free on any plan, including DOC to DOCX.
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?
No, not by default. You choose a retention window at upload — immediate, 1 hour, 24 hours or 7 days — and the file is permanently deleted after that.
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, and nothing is charged against your quota for a failed job.