Compare Two Word Documents Online Free
Quickly identify changes, edits, additions, and deletions between two Microsoft Word (.docx) files. Our client-side document comparison engine extracts full body text, calculates differences word-by-word, and highlights revisions instantly in your browser with complete privacy.
Whether you are reviewing revisions in legal contracts, proofreading student essays, checking client proposals, or tracking changes made across draft versions, comparing documents manually is slow and prone to oversight. DocxLab provides an instant redline comparison tool that spots even subtle wording adjustments without requiring Microsoft Word or expensive desktop software.
Because all text extraction and comparison algorithms run directly in your web browser via WebAssembly and JavaScript, neither file is ever transmitted to an external server. Your sensitive agreements, personal documents, and proprietary business drafts remain completely confidential.
How to Compare Two Word Documents
Compare draft iterations, inspect contract redlines, and export difference reports with these three simple steps.
Upload Both Word Files
Select your baseline original document (.docx) and the revised draft you want to compare against.
Compute Word-Level Differences
Click Compare to extract plain text and run a real-time Longest Common Subsequence (LCS) diff.
Review & Download Report
Inspect highlighted additions and deletions in unified or side-by-side mode, or download a Word report.
Frequently Asked Questions about Compare Two Word Documents
How does this tool detect differences between Word documents?
DocxLab uses client-side OpenXML text extraction to read paragraph and run text from both documents, then computes a token-level diff. Additions in the second file appear in green, while deletions from the original appear with red strikethrough.
Are my private documents uploaded to any server or cloud database?
No. The entire comparison runs locally inside your web browser. Neither your original document, your revised draft, nor the resulting diff report ever leave your computer.
Can I download a comparison summary report?
Yes. You can download a complete Word document (.docx) containing the formatted comparison summary and color-coded redline text, or export a clean plain-text summary.
Does this tool support older .doc binary files?
DocxLab supports modern Microsoft Word (.docx) documents. If you have legacy .doc files, open them in Word or LibreOffice and save as .docx before comparing.