How do I convert DOC to DOCX online for free?

Document Conversion

Convert DOC to DOCX Online

Free online Word Document to Word Document (OOXML) converter. Files are processed locally in your browser — no uploads, 100% private.

.DOC

.DOCX

Drop your .DOC file here

or click to browse from your device

Accepts .DOC files

100% Private

Files never leave your device

Instant

In-browser processing

No Account

No sign-up required

How to Convert DOC to DOCX Online

1Upload your .DOC file using the drop zone above or click to browse
2Your file converts automatically to .DOCX format entirely within your browser
3Download your converted file — no account or email needed

Frequently Asked Questions

Upload your Word Document file using the drop zone above. Your file is instantly converted to Word Document (OOXML) format right inside your browser using client-side processing — no account, no software, and no cost. When conversion is complete, click Download to save your DOCX file.

Completely. Our converter runs 100% in your browser using local processing, so your DOC file never leaves your device or touches any external server. We do not store, access, or transmit your files at any point.

Desktop: up to 500 MB. Mobile: up to 200 MB. All processing happens locally in your browser — your files are never uploaded to any server.