Initializing... drag & drop files here
Supports: DOCX
DOCX is the default Word document format — full name Office Open XML (OOXML), introduced by Microsoft with Word 2007 and described in the ISO/IEC 29500 standard. Despite the single extension, a DOCX file is not one document: it is a ZIP package containing XML parts (the text, styles, numbering, and embedded media), which is why renaming a .docx to .zip lets you peek inside. It replaced the older binary .doc format that Word used through 2003.
DOCX is the right format for writing and editing, but the wrong format for almost everything downstream. The common reasons to convert it:
.doc format. Converting down to DOC keeps those tools working.| Property | DOCX | DOC | ODT |
|---|---|---|---|
| Full name | Office Open XML (Word) | Word Binary Format | OpenDocument Text |
| Standard | ISO/IEC 29500 (OOXML) | Microsoft proprietary | ISO/IEC 26300 (ODF, OASIS) |
| Introduced | Word 2007 | Word 97-2003 era | OpenOffice.org 2.0 (2005) |
| File structure | ZIP of XML parts | Single binary blob | ZIP of XML parts |
| Native app | Microsoft Word 2007+ | Word 97-2003 | LibreOffice, Apache OpenOffice |
| Open / proprietary | Open spec, Microsoft-led | Proprietary, undocumented | Open, vendor-neutral |
| Best for | Day-to-day Word editing | Legacy compatibility | Open-source and government workflows |
Microsoft Word 2007 and every later version open DOCX natively, as do Google Docs, LibreOffice Writer, Apache OpenOffice, Apple Pages, and most modern word processors and phone document viewers. Because DOCX is a documented, ZIP-based XML format rather than a closed binary, support is broad. The friction is almost always with very old software — Word 2003 and earlier need either the Microsoft Office Compatibility Pack or a conversion down to the binary DOC format.
Yes — that is the main reason to do it. The conversion renders the document's layout into fixed PDF pages, so fonts, page breaks, tables, headers, and images are locked in place and display identically regardless of the reader's device or installed fonts. The one thing you give up is easy editing: a PDF is meant to be read and printed, not re-flowed like a Word file. If you need to edit again later, keep the original DOCX.
DOCX stores text and layout instructions, but it does not always embed the fonts themselves. If the recipient's machine lacks a font you used, Word substitutes another one, which shifts line and page breaks. Different Word versions and default margins can also nudge the layout. Converting to PDF before sharing sidesteps the whole problem because the PDF carries the rendered page, not just instructions for rebuilding it.
No. DOC is the older Microsoft Word binary format used through Word 2003 — a single opaque file. DOCX, introduced with Word 2007, is Office Open XML: a ZIP package of XML parts, which is smaller, less corruption-prone, and based on a published standard (ISO/IEC 29500). They are not interchangeable byte-for-byte, so opening a DOCX in software that only understands DOC requires a conversion, which is exactly what the DOCX to DOC tool does.
In our testing, a 12-page text-heavy DOCX (a few inline images) converted to roughly 180 KB on the Screen (Best) preset and about 320 KB on Printer, where image resolution is preserved. Image-dense documents vary far more — a brochure-style DOCX with full-page photos can land in the multi-megabyte range. If size matters more than print fidelity, choose Screen (Best); if you plan to print, choose Printer or Prepress and accept the larger file.
Yes. Pick JPG, PNG, or TIFF as the output and each page of the DOCX is rendered to a separate image (TIFF can hold all pages in one multi-page file). This is handy for thumbnails, embedding a page in a forum or slide, or building a flat archive. The tradeoff is that the text becomes pixels — there is no selectable or searchable text layer in a raster image, so keep the DOCX or a PDF if you need the words back.
Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark on the output, and your documents are never shared or made public. If you only need to shrink a finished PDF afterward rather than reconvert, the Compress PDF tool handles that separately.