Compare PDFs
Compare two PDFs side-by-side or in overlay mode. Highlight text differences, additions, and deletions instantly. 100% private.
First PDF (Original)
Upload First PDF
Second PDF (Modified)
Upload Second PDF
About This Tool
Never miss a revision again. The Compare PDFs tool is an advanced "diff" engine that analyzes two versions of a document to find exactly what has changed. Whether it’s a single comma in a legal contract or a new paragraph in a technical manual, our tool finds it.
You can choose between Side-by-Side mode for easy visual tracking, or Overlay mode (Digital Lightbox) which stacks pages on top of each other to reveal subtle shifts in layout or graphics. The tool color-codes deletions in red and additions in green, making auditing document revisions effortless.
Secure Legal Auditing: Since comparison happens locally, your sensitive contracts and internal drafts never leave your browser, providing total privacy for your most critical data.
How to Use
Upload Two PDFs
Upload your original version and the new version.
Compare Documents
Choose between side-by-side or overlay views to see highlighted changes.
Export Results
Download a summary of differences or an annotated comparison PDF.
Use Cases
Contract Review
Instantly identify "stealth" edits in legal agreements.
Document Revision
Verify that only the requested changes were made to a draft.
Academic Proofing
Compare an original essay with an edited version to track improvements.
Frequently Asked Questions
Can it detect image changes?
Yes, in "Overlay" mode, the tool will highlight any visual pixels that have shifted or changed, including images and logos.
Does it work with scanned PDFs?
For the most accurate text comparison, scanned PDFs should be processed with OCR. Otherwise, the tool will rely on visual (image) comparison.
What do the different colors mean?
Typically, content removed from the first document is highlighted in red, and new content added to the second is in green.