Compare PDFs
Tool ID: compare
Compare two PDF documents and visually highlight word-level differences. Runs entirely in your browser - no files are sent to the server.
How to Use
- Upload Original PDF - Select the original/older version
- Upload Modified PDF - Select the new/revised version
- Compare - Process the documents
- Review Differences - View highlighted changes
Features
- Side-by-side or stacked layout - Toggle between horizontal and vertical views
- Word-level diff - Removed words highlighted in red, added words highlighted in green
- Change navigation - Dropdown selectors to jump between deletions and additions
- Synchronized scrolling - Optional linked scrolling between the two panes
- Zoom and pan - Scroll-wheel zoom, pinch-to-zoom, and drag to pan
Limitations
- Works best with digital PDFs (not scanned). For scanned documents, run OCR first
- Compares extracted text only - layout-only or image-only changes are not detected
- Very large or highly dissimilar documents may be stopped early with a warning
Related Tools
- OCR - Make scanned PDFs searchable before comparing