DOCX vs ODT — Microsoft Word vs Open Standard

DOCX (Office Open XML) and ODT (OpenDocument Text) are both ZIP-based XML document formats. DOCX is controlled by Microsoft; ODT is an ISO-standardised open format maintained by the OASIS consortium.

Compatibility:

• DOCX: Opens natively in Microsoft Word, Google Docs, LibreOffice, WPS Office, Apple Pages, and virtually every other word processor. The de facto universal standard.
• ODT: Opens natively in LibreOffice and OpenOffice. Microsoft Word 2010+ can open ODT but may have rendering differences. Google Docs accepts ODT uploads.

Cross-application fidelity:

• DOCX in LibreOffice: Generally good for simple documents; complex formatting (tables, track changes, custom styles) may differ
• ODT in Microsoft Word: Simple documents usually render correctly; advanced features like headers/footers and custom character styles may shift

Features: Both support equivalent features — text formatting, tables, images, tracked changes, styles, headers/footers. DOCX supports Word-specific features like SmartArt, content controls, and deeper macro integration.

Use DOCX when: sharing documents with business or academic contacts (DOCX is expected), collaborating with Microsoft 365 users, or using Google Docs as your primary editor.

Use ODT when: you work exclusively in LibreOffice, your organisation mandates ODF format, archiving documents in a vendor-neutral format, or you want the document to remain readable without any specific software vendor.

Practical advice: For shared documents, always use DOCX. For personal archives where you want to avoid Microsoft lock-in, ODT is a valid choice.