Compare two PDF files online for free. The tool extracts text from both files and highlights differences line by line — removed text in red, added text in green.
Compare PDFs
Upload two PDFs and see their differences highlighted.
Quick answer
Compare two PDFs online free — upload both files and the tool extracts their text content, then highlights every difference. Built for anyone reviewing a revised contract or checking an edited report. The comparison runs entirely in your browser.
Original PDF (A)
Drop original PDF here
or click to browse
PDF files only — up to 20MB each
Revised PDF (B)
Drop revised PDF here
or click to browse
PDF files only — up to 20MB each
Comparison method: text-content diff. Works best with digitally-generated PDFs that have a text layer.
How to compare two PDFs online
Comparing two PDFs extracts text from both files and performs a line-by-line comparison. Removed lines are red, added lines are green, unchanged lines are gray.
Add the original PDF
Drop the original version into the first slot.
Add the revised PDF
Drop the revised version into the second slot.
Compare and review
Click Compare PDFs — differences are highlighted in color.
When comparing PDFs comes in handy
Review a revised contract
See exactly which clauses were added or removed.
Check an edited report
Confirm what changed in a revised report.
Verify document versions
Check whether two copies are identical.
Key features
Text-content diff
Extracts text from both PDFs and compares line by line.
Color-coded results
Removed in red, added in green, unchanged in gray.
Clear method communication
The tool clearly states it uses text-content comparison.
Supported formats
- Input: two PDF files (.pdf)
- Output: a color-coded line-by-line text comparison
Privacy and security
Limitations
- Uses text-content comparison — scanned PDFs with no text layer will show no differences.
- Does not detect visual differences like image changes or layout shifts.
- Very large PDFs may take longer to process.
Related Tools
All toolsFrequently Asked Questions
How does the PDF comparison work?
The tool extracts text from both PDFs and compares line by line. Removed lines are red, added lines are green.
Can it compare scanned PDFs?
Scanned PDFs have no text layer, so extraction returns nothing. Use OCR first to add a text layer.
What differences does it detect?
It detects text-content differences line by line. It does not detect visual differences like image changes.
Is my PDF uploaded to a server?
No. Both PDFs are read into local memory and compared on your own device.
What if the PDFs have different page counts?
The comparison works on full text regardless of page count. Extra pages show as added lines.