Convert DOC to DOCX

It opens everywhere, but it is a compatibility choice rather than a good one. The binary formats predate the XML packages, carry macro payloads that many mail servers strip on sight, and are being steadily deprecated by Microsoft itself. Use them when a specific piece of old software demands them, and the XML format otherwise. DOCX still reflows differently between renderers, so a document that paginates correctly in Word can shift in LibreOffice or Google Docs.

A ZIP archive of XML parts, together with the images and fonts those parts refer to. That is why one barely shrinks when it is archived, why a damaged one can sometimes be partly recovered instead of being a total loss, and why software that is not the original application can open it at all — the layout was published rather than reverse-engineered. It is also why the extension matters more than it looks: rename it and the tools that recognise it by name stop opening it, though not a byte inside has changed. DOCX is Office Open XML, the format Word has produced by default since 2007 and an ISO standard since 2008.

Because the file has to open on the other end, and version and vendor differences decide whether it will. Two formats in the same family can still be years apart in what software reads them, how large they are on disk, and which features they carry. The conversion normalises the file onto whichever one the recipient actually supports. DOC is the binary Microsoft Word format used from Word 97 through Word 2003.

Yes — basic DOC → DOCX conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.

Free accounts: up to 100 MB per DOC file. Premium: typically 1 GB per file, depending on the DOC source type. Very large files are split into chunks server-side when the DOCX format allows.

Conversion preserves all information that both DOC and DOCX can represent. Format-specific features that the DOCX format doesn't support (e.g. vector data in raster output, formulas in plain-text output) are rasterized or stripped — see the format-specific notes on the result page.

Yes — drop multiple DOC files into the upload zone and they are queued in parallel. Premium has more parallel workers; on a 50-file batch this is the difference between minutes and seconds.

Yes — the UI is responsive and the conversion pipeline runs server-side, so mobile devices upload-then-download just like desktops. iOS and Android browser file pickers (camera roll, Files app) work end-to-end.

Chrome, Firefox, Safari (15+), Edge, and Opera. The converter uses standard `<input type="file">` upload — no WebAssembly or PWA dependencies — so even older browsers work.

Yes — uploaded DOC files are processed in isolated workers and deleted within minutes. We never view, retain, or share content. See /privacy/ for the data-retention window.

Disable any pop-up blocker, then click the download button manually. The result link stays active for 24 hours, so if your network fails mid-download, you can re-trigger from the result page without re-uploading the DOC.