DOCX (Word)
Also known as: docx file, Word document, Microsoft Word format
DOCX is the default file format for Microsoft Word documents since Word 2007. It is a ZIP package of compressed XML, so a text-heavy document stays small — but embedded photos and fonts are what actually inflate the file size.
- Default Word format since Word 2007
- A ZIP package of XML plus an embedded media folder
- Images, not text, drive file size
What is inside a DOCX
A .docx file is not a single blob — it is a ZIP archive containing XML for the text and layout plus a media folder for any images. Because the text is compressed, a long report with no pictures often weighs only tens of kilobytes.
The size jumps the moment you paste in screenshots or high-resolution photos, since those are stored inside the package at full quality. Embedded fonts and tracked-change history add more.
DOCX and storage
A folder of Word documents rarely fills a phone on its own; the weight is almost always the images inside. Compressing pictures before inserting them, or exporting to PDF for sharing, keeps files lean.
To convert between formats without Word, /tools/pdf-to-word turns a PDF back into an editable document, and /tools/word-to-pdf locks a DOCX into a fixed-layout PDF for sending.