Online Tool Store
PDF Page Compare Overlay
Upload two PDF versions and overlay a chosen page from each to visually highlight the regions that differ between them. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
PDF Page Compare Overlay
- Document A
- contract-v1.pdf, page 3
- Document B
- contract-v2.pdf, page 3
Example shown — replace it with your own PDF pages.
Result
How it works
- Upload two versions of a PDF and pick a page from each.
- The tool overlays the pages and highlights differing regions.
- Review the highlighted changes side by side.
The method
Each page is rendered to an image, aligned, and compared pixel region by pixel region; areas exceeding a difference threshold are outlined in the overlay.
FAQ
How does the overlay work?
The two pages are rendered on top of each other with one shown in a tinted overlay, so any area that differs between them stands out visually.
Does this compare the whole document?
You compare one page pair at a time, which keeps the overlay clear — for a multi-page document, step through each pair in turn.
What kinds of changes does it catch?
Visual differences — moved or resized elements, added or removed text blocks, changed images — anything that shifts the rendered pixels between the two pages.
How we compare
| Feature | Online Tool Store | Manual side-by-side review | Full document diff software |
|---|---|---|---|
| No software install | Yes | N/A | No |
| Highlights changes automatically | Yes | Manual | Yes |
| Free to use | Yes | Free | Often paid |
For spotting differences between two versions of a page quickly, this beats scanning both side by side manually.