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Microsoft Word documents. Text extracted and compared with formatting indicators.
Microsoft introduced the .docx format with Office 2007, transitioning from the proprietary binary .doc format to Office Open XML (OOXML), standardized as ECMA-376 and ISO/IEC 29500. A docx file is a ZIP archive containing XML documents that describe content, styles, relationships, headers, footers, images, and metadata. Word documents remain the dominant format for business writing — contracts, proposals, reports, policies, procedures, letters, and memos are overwhelmingly authored in Microsoft Word. The legal industry relies on Word for drafting agreements with tracked changes and comments, and law firms frequently compare document versions to produce redlines that show every modification between drafts.
Word's revision tracking features are built-in but limited to sequential editing within a single document — comparing two separate files requires external tools. The format supports rich text formatting, tables, images, charts, shapes, SmartArt, footnotes, endnotes, cross-references, table of contents generation, and mail merge. Styles and templates provide consistent formatting across organizational documents. Word integrates with SharePoint and OneDrive for collaborative editing, and its comment and review features support multi-stakeholder document approval workflows.
The OOXML specification allows third-party tools to parse, create, and modify docx files: python-docx, Apache POI (Java), docx4j, and Open XML SDK (.NET) provide programmatic access. Document comparison extracts text content with formatting indicators, identifying changed paragraphs, added or deleted sections, modified tracked changes, and altered document properties — providing complete visibility into how a document evolved between versions.
Word document comparison serves legally binding and compliance-critical workflows where every textual change carries potential consequences. Comparing docx files catches modified contract language that alters legal obligations, changed policy wording that shifts compliance requirements, inserted or deleted paragraphs that restructure document flow, and altered tracked changes that misrepresent the revision history.
Legal teams producing redlines, compliance officers verifying policy updates, and editors reviewing manuscript revisions all depend on accurate document comparison that surfaces every content and formatting change.
UtraDiff compares Word documents by extracting text content with formatting indicators, preserving paragraph structure, heading hierarchy, and list nesting. The extracted text is diffed structurally, highlighting added, removed, and changed paragraphs. Bold, italic, and style changes are marked with formatting annotations so you can distinguish content edits from styling updates.
Header, footer, and footnote text is compared separately. Document metadata differences — author, revision count — are reported alongside.
Supported extensions: .docx .doc