Compare PDF
Compare two PDF files online for free — find every text difference between versions, with additions highlighted in green and deletions in red, page markers, and a changes-only view. Compare by words or lines. Runs 100% in your browser.
100% private — everything runs in your browser. Conversion happens on your device; nothing is uploaded.
Compares the text of two PDFs — additions are green, deletions red. It doesn’t compare images or layout, and scanned PDFs need OCR first. Both files stay on your device.
How to compare two PDFs
- Drop the original PDF on the left.
- Drop the changed PDF on the right.
- Review the differences — additions in green, deletions in red.
- Switch between word and line comparison, or print the report.
What you can use it for
- Check what changed between contract or policy versions
- Review edits to reports, theses and proposals
- Spot changes in terms and conditions
- Verify that a final PDF matches the approved draft
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See all free PDF tools →Frequently asked questions
How do I compare two PDF files?
Drop the original and the new version into the two boxes. The text is compared straight away and every change is highlighted.
Does it compare images and formatting?
No — it compares the text. Changes to images, colours or layout aren't detected.
Can it compare scanned PDFs?
Scanned PDFs have no text layer. Run them through OCR PDF first, then compare.
Words or lines — which should I use?
Words shows exactly which words changed inside a sentence; Lines is easier to read for heavily edited documents.
Are my files uploaded?
No. Both PDFs are read and compared in your browser.