Compare PDFs
How to use
Compares two versions of a PDF side by side and highlights the text that was added, removed or changed between them. Upload both files and the differences are marked clearly, making it easy to spot edits in contracts or reports.
Original PDF
First document
Revised PDF
Second document
- Reviewing a redlined contract against the original before signing
- Checking a revised report matches the intended changes from an editor
- Verifying that a reprinted or re-exported document matches its source file
- Tracking manuscript changes across drafts without manually scanning every line
Free and private. Everything runs on your own device, with no account and no uploads.
Compare PDFs highlights the differences between two versions of a document side by side, which is invaluable when reviewing a redlined contract, checking a revised report against the original, or verifying that a reprinted document matches its source. Both files are loaded and compared directly in your browser, so neither document is uploaded to a remote comparison service.
It primarily compares text and page content differences, highlighting additions and removals between the two versions.
Yes, but know how it pairs them: page 1 is compared with page 1, page 2 with page 2, and extra pages at the end show as added or removed. If a page was inserted near the start, every later page is compared with the wrong one and looks heavily changed. For a document whose pagination shifted, extract the text of both and compare it with the text diff tool instead.
Comparison works best on PDFs with a text layer; purely scanned image pages may only be compared visually rather than by text differences.
Yes, though comparing very large files may take longer depending on your device performance.
Depending on sensitivity settings, formatting-only changes without text differences may or may not be highlighted.
- 1
Upload both PDFs
Select the original PDF and the revised version you want to compare.
- 2
Run the comparison
The tool analyzes both documents page by page to detect differences.
- 3
Review the highlighted changes
Added, removed, or altered content is highlighted in the side-by-side view.
- 4
Export or save the results
Save a summary or annotated view of the differences if needed.
- ·Use this on PDFs with a text layer for the most reliable results; purely scanned pages can only be compared visually.
- ·Expect page-count differences to show up clearly as added, removed, or shifted pages between versions.
- ·For very large documents, give the comparison a bit more time to process on lower-powered devices.