DOCX

A ZIP archive of XML parts describing text, styles and embedded media — the default Word format since 2007.

Representation

binary

Compression

Deflate

Lossy

No

Open specification

Yes

Encryption support

Yes

Introduced

2007

Created by

Microsoft

1. 2006Standardised as ECMA-376
2. 2007Becomes Word's default format

• Windowsfull
• macOSfull
• Linuxfull
• Androidfull
• iOSfull

Applications: Word, Google Docs, LibreOffice, Pages.

• Rich editing features
• Open, documented XML
• Smaller than the old binary DOC

• Layout can shift between Word versions and other editors
• Not a fixed-layout format

• Reports
• Letters
• Collaborative editing

• Send PDF when layout matters and DOCX when the recipient must edit

DOCX to PDF is high fidelity. DOCX to Markdown keeps structure but drops fine typography.

• DOCX to PDF
• DOCX to TXT
• DOCX to HTML
• DOCX to MD
• DOCX to ODT
• DOCX to RTF
• DOCX to EPUB

• Convert to PDF

  Send PDF whenever the layout must survive the trip; DOCX re-flows differently on other machines and editors.

  Trade-offs: The recipient cannot easily edit a PDF.

  Learn about PDF

Every conclusion below is derived from the structured facts on this page — nothing is written by hand.

• Operating system compatibility100/100

  • Because Windows, macOS, Linux, Android and iOS all open it without extra software.
  • Because most platforms handle it natively.

• Software compatibility100/100

  • Because a broad range of applications read and write it.
  • Because several mainstream applications support it.

• Printing suitability100/100

  • Because lossless data means no compression artefacts appear at print resolution.
  • Because it is a page-description format built around fixed layout.

• Cloud compatibility100/100

  • Because an open specification means cloud SDKs can implement it without licensing friction.
  • Because it converts into many other formats, which suits automated pipelines.

• AI compatibility100/100

  • Because open specifications are implemented by the open-source decoders that ML stacks rely on.
  • Because lossless pixels avoid compression artefacts leaking into training data.
  • Because wide library support means common data loaders can read it.

• Long-term archiving100/100

  • Because the specification is public, so a decoder can always be rebuilt.
  • Because lossless storage preserves the original data for future migrations.
  • Because it is a current, actively maintained format.

• Professional editing100/100

  • Because lossless data survives repeated open-edit-save cycles without degrading.
  • Because professional applications read and write it.

• Open standards100/100

  • Because the specification is published openly.

• Popularity100/100

  • Because it sits at the centre of the format ecosystem, with many documented relationships.
  • Because mainstream applications ship support for it.
  • Because every mainstream operating system handles it.

• Future-proofing100/100

  • Because it is actively maintained and current.
  • Because open specifications outlive the companies that create them.
  • Because nothing in the graph supersedes it yet.

• Everyday consumer usage75/100

  • Because it opens by double-clicking on every mainstream device.
  • Because it is a current format that people and services still expect.

• Compression efficiency23/100

  • Because it stores data losslessly, so files stay large.
  • Because its codec generation predates modern entropy coding and block partitioning.

• Web suitability33/100

  • Because lossless payloads cost more bandwidth than the web usually justifies.