Fine-Grained Precision
Detects changes at the run and character level, not just whole paragraphs. See insertions, deletions, and formatting changes with pinpoint accuracy — including inside tables, text boxes, and content controls.
Compare Word Documents Online
See Every Change
Upload two DOCX files and get a single document with every difference highlighted using Word's native tracked changes. A fast, free document comparison tool with fine-grained precision.
Try the Free DemoHow It Works
Three steps. No signup required.
1
Upload
Select your original and modified Word documents.
2
Compare
Our engine analyzes every paragraph, table, header, footer, text box, content control, and character.
3
Download
Get a DOCX with tracked changes you can open in Microsoft Word.
Why Choose This Document Comparison Tool?
Built for speed and accuracy.
Native Word Revisions
Output uses Word's built-in tracked changes markup. Open in Microsoft Word, accept or reject changes, add comments — your normal workflow. Footnotes, endnotes, comments, and hyperlinks are all tracked.
Engineered for Speed
A purpose-built DOCX comparison engine optimized for large documents. No waiting, no spinning — even lengthy contracts and legal agreements are compared in seconds.
Formatting Detection
Catches bold, italic, underline, font, and style changes — even when the text is identical. Every formatting difference is tracked.
Your Documents Stay Private
Files are processed entirely in memory and never saved to disk, never stored, and never shared with anyone. They are permanently discarded the instant your comparison completes. No copies, no logs, no exceptions.
API Integration
Need to integrate DOCX comparison into your workflow? Our REST API works from any language — C#, Python, JavaScript, Java, or a simple cURL command. Contact us for enterprise access.
Ready to Compare Your Documents?
Try the Free DemoWant to learn more? See how Document Delta compares to Word's built-in compare.