Compare Two PDFs
Visual diff between two PDFs. Highlights what changed.
Files never leave your browser
Frequently asked questions
Never. Both PDFs are rasterized and compared entirely in your browser. Your files never leave your device.
Each page is rendered as an image at the chosen DPI. Pixels that differ between the two versions are highlighted in red on the diff image.
The tool compares matching pages (1 vs 1, 2 vs 2, etc.) up to the shorter document. Extra pages from the longer document are shown as-is with no diff.
The ZIP contains three folders: "a" (pages from PDF A), "b" (pages from PDF B), and "diff" (red-highlighted difference images).
This happens when the PDFs have different page sizes or when content is shifted by even 1 pixel. Make sure both PDFs use the same page size and layout.