Compare PDF
See exactly what changed between two versions of a PDF, line by line.
Original
Revised
Both files are processed automatically and removed from our servers shortly after.
Comparison Result
Green = added in revised · Red = removed from original
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See exactly what changed between two PDFs
Compare an original and a revised version line by line, with additions and deletions highlighted.
Upload Both Versions
Upload the original PDF and the revised PDF you want to compare it against.
We Compare the Text
Each page's text is compared line by line to find exactly what was added or removed.
Review the Differences
See additions and deletions highlighted directly in your browser, page by page.
Built for Clear Version Comparison
Everything you need to spot what changed between two documents.
Private Processing
Both files are processed automatically and removed from our servers shortly after comparison finishes.
Line-by-Line Diffing
Every page's text is compared line by line, so you see exactly what was added, removed, or changed.
Color-Coded Results
Additions and deletions are shown in different colors, page by page, so changes are easy to scan.
Handles Different Page Counts
If the two files have a different number of pages, the tool compares what it can and tells you how many extra pages the longer file has.
Unlimited Usage
No file limits and no subscriptions. Compare as many PDF pairs as you need at no cost.
Cross-Platform
Works in any modern browser on Windows, Mac, Linux, and mobile devices, with no software to install.
Who Compares PDFs
Common reasons to check what changed between two versions.
Contract Managers
Priya compares a contract's original draft against the redline version a client sent back.
Editors
Sam checks exactly which paragraphs changed between two drafts of a report before approving it.
Procurement Teams
David compares two vendor proposal versions to spot which terms were quietly changed.
Frequently Asked Questions
What kind of differences does this detect?
Text-level changes — lines added, removed, or changed between the two documents, shown page by page.
Does it compare images or formatting?
No, only the extracted text content of each page. Visual and formatting-only changes are not detected.
What happens if the two PDFs have a different number of pages?
The tool compares as many matching pages as it can and lets you know how many extra pages the longer file has.
Do I get a downloadable file?
No, the comparison is shown directly on this page rather than as a file to download.
Which order should I upload the files in?
Upload the older file as Original and the newer file as Revised so additions and deletions are labeled correctly.
Does it work with scanned PDFs?
Only if the PDF has real, extractable text. Scanned pages without an OCR text layer have no text to compare.
Is Compare PDF free to use?
Yes. There is no cost, no subscription, and no account required.
Can I use this on my phone?
Yes, the tool is fully responsive and works in any modern mobile browser on iOS and Android.