# Convert DOC to DOCX

> Convert DOC to DOCX online for free in seconds. Files are processed in a secure, isolated sandbox and deleted automatically. No sign-up, no watermarks.

URL: https://www.converterrr.com/doc-to-docx

- Runs in an isolated cloud sandbox with LibreOffice: files are deleted automatically, and the job uses cloud credits.
- Engines: LibreOffice (cloud).
- API: available. `POST /api/v1/jobs` with `"output_format": "docx"` (paid plans).
- More: [Document converter](https://www.converterrr.com/document-converter), [DOC converter](https://www.converterrr.com/doc-converter).

## How to convert DOC to DOCX

1. **Add your DOC files.** Drag and drop DOC files onto the converter, paste them, or click to browse. You can add several at once.
2. **Choose DOCX.** DOCX is already selected. Open Options if you want to change quality, size or metadata.
3. **Convert.** Click Convert. Files are processed in a secure cloud sandbox and are usually ready in seconds.
4. **Download your DOCX.** Download each DOCX file, or everything at once as a ZIP.

## Good to know

- DOC files are typically used for older Word documents and legacy systems, while DOCX is best for editable documents in Word, Google Docs and Pages.
- This conversion runs on LibreOffice in an isolated cloud sandbox. Files are encrypted in transit and deleted automatically.

## DOC vs DOCX

|  | DOC | DOCX |
| --- | --- | --- |
| Full name | Microsoft Word 97–2003 | Microsoft Word Document |
| Type | Document | Document |
| Extensions | .doc | .docx |
| MIME type | application/msword | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Best for | older Word documents and legacy systems | editable documents in Word, Google Docs and Pages |
| Properties | legacy format, proprietary | open standard |

**DOC:** DOC is the legacy binary Word format used before 2007. Newer tools prefer DOCX, but DOC is still everywhere in old archives.

**DOCX:** DOCX is the modern Microsoft Word format, an XML-based package that stores text, styles, tables and images.

The other way around: [convert DOCX to DOC](https://www.converterrr.com/docx-to-doc).

## Related conversions

- [DOCX to DOC](https://www.converterrr.com/docx-to-doc) (cloud)
- [DOC to PDF](https://www.converterrr.com/doc-to-pdf) (cloud)
- [PDF to DOCX](https://www.converterrr.com/pdf-to-docx) (cloud)
- [EPUB to DOCX](https://www.converterrr.com/epub-to-docx) (in the browser)
- [DOC to EPUB](https://www.converterrr.com/doc-to-epub) (cloud)
- [CSV to DOCX](https://www.converterrr.com/csv-to-docx) (in the browser)
- [DOC to TXT](https://www.converterrr.com/doc-to-txt) (cloud)
- [TXT to DOCX](https://www.converterrr.com/txt-to-docx) (in the browser)
- [DOC to HTML](https://www.converterrr.com/doc-to-html) (cloud)
- [DOC to ODT](https://www.converterrr.com/doc-to-odt) (cloud)
- [HTML to DOCX](https://www.converterrr.com/html-to-docx) (in the browser)
- [DOC to RTF](https://www.converterrr.com/doc-to-rtf) (cloud)

## Convert DOC to other formats

[DOC to PDF](https://www.converterrr.com/doc-to-pdf), [DOC to EPUB](https://www.converterrr.com/doc-to-epub), [DOC to TXT](https://www.converterrr.com/doc-to-txt), [DOC to HTML](https://www.converterrr.com/doc-to-html), [DOC to ODT](https://www.converterrr.com/doc-to-odt), [DOC to RTF](https://www.converterrr.com/doc-to-rtf)

## Convert other formats to DOCX

[PDF to DOCX](https://www.converterrr.com/pdf-to-docx), [EPUB to DOCX](https://www.converterrr.com/epub-to-docx), [CSV to DOCX](https://www.converterrr.com/csv-to-docx), [TXT to DOCX](https://www.converterrr.com/txt-to-docx), [HTML to DOCX](https://www.converterrr.com/html-to-docx), [Markdown to DOCX](https://www.converterrr.com/md-to-docx), [MOBI to DOCX](https://www.converterrr.com/mobi-to-docx), [AZW3 to DOCX](https://www.converterrr.com/azw3-to-docx), [ODT to DOCX](https://www.converterrr.com/odt-to-docx), [RTF to DOCX](https://www.converterrr.com/rtf-to-docx), [LaTeX to DOCX](https://www.converterrr.com/tex-to-docx), [IPYNB to DOCX](https://www.converterrr.com/ipynb-to-docx), [Pages to DOCX](https://www.converterrr.com/pages-to-docx), [FB2 to DOCX](https://www.converterrr.com/fb2-to-docx), [CBZ to DOCX](https://www.converterrr.com/cbz-to-docx), [CBR to DOCX](https://www.converterrr.com/cbr-to-docx), [TSV to DOCX](https://www.converterrr.com/tsv-to-docx), [AZW to DOCX](https://www.converterrr.com/azw-to-docx), [reST to DOCX](https://www.converterrr.com/rst-to-docx), [Typst to DOCX](https://www.converterrr.com/typ-to-docx), [Org to DOCX](https://www.converterrr.com/org-to-docx), [WPD to DOCX](https://www.converterrr.com/wpd-to-docx), [MediaWiki to DOCX](https://www.converterrr.com/wiki-to-docx), [OPML to DOCX](https://www.converterrr.com/opml-to-docx)

## DOC to DOCX: frequently asked questions

### How do I convert DOC to DOCX?

Drop your DOC file onto the converter above, make sure DOCX is selected, and click Convert. When it's done, download the DOCX file — it usually takes a few seconds.

### Is it safe to convert DOC to DOCX here?

Yes. Your file is sent over an encrypted connection to an isolated sandbox that's created for your job only, then both the original and the result are deleted automatically.

### Is the DOC to DOCX converter free?

Yes. Cloud conversions like this one use credits, and you get free credits every day (3 without an account, 10 with a free account).

### Will converting DOC to DOCX reduce quality?

No — DOCX preserves the content of your DOC file as faithfully as the format allows.

### Can I convert multiple DOC files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

### Can I convert DOCX back to DOC?

Yes — use our DOCX to DOC converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.