Compare PDF
Compare two versions of a PDF page by page and highlight the differences.
Original file
Supported formats: PDF
Modified file
Supported formats: PDF
How to use
- 1
Upload the original file.
- 2
Upload the modified file.
- 3
Review each page with differences automatically highlighted.
About the Compare PDF tool
"What changed between the two versions?" — a question that devours hours when comparing two similar contracts page by page with the naked eye, where one missed edit can cost dearly. This tool compares two PDF versions visually: upload both files, and every page is shown with its status — identical or different — with the changed regions highlighted in red beside both versions.
Comparison is pixel-level, so it catches any visible change: edited text, a swapped number, an added signature, or a new stamp. Extra pages in either file are clearly flagged. Results are for on-screen review — and crucially, both files are processed inside your browser with no upload, exactly what comparing confidential contracts calls for.
When do you need this tool?
Reviewing contract versions
Verify the copy returned by the other party changed only in the clauses actually agreed upon.
Confirming requested edits
Compare a designer's or printer's new proof against the old one to confirm all your notes were applied.
Detecting document tampering
Compare a received document against your original to expose any undisclosed change before signing.
Why ToolsRio?
Real privacy
All processing happens inside your browser. Your files are never uploaded to any server, and nobody can see them — not even us.
Free without limits
No watermark, no file-count limits, and no hidden paid tiers.
Instant speed
No waiting for uploads and downloads to a remote server — processing starts immediately on your device.
No sign-up
No account, no email, no annoying ads. Open the tool and use it right away.
Frequently asked questions
Can I download the comparison result as a file?+
No, this tool is for on-page visual review only and doesn't produce a downloadable file.
What if the two files have a different number of pages?+
Extra pages in either file are shown with a note indicating they only exist in that one file.