Compare Two PDF Files
Spot text and visual differences between two versions.
Runs in your browser
Compare two versions of a contract or report on your phone or computer to see what changed. Added text shows in green and removed text in red, and a visual overlay reveals layout and image changes.
How to compare two PDF files
- 1Select two PDFs: the original and the changed version.
- 2Choose a mode: text differences or visual overlay.
- 3Browse the pages to see additions in green and removals in red.
Why Sahl PDF?
- Text mode shows added and removed words
- Visual overlay reveals layout and image changes
- Useful for reviewing contracts and revised documents
- Compared in your browser — no file is uploaded
Frequently asked questions
How do I compare two PDF files?
Select the original and the changed file, choose a comparison mode, and the differences are highlighted on each page.
What is the visual overlay for?
It shows visual differences like changed images, formatting or element positions, even when the text is the same.
Can I compare more than two files?
No. The tool compares two files at a time: the original and the revised version.
Are my files safe during comparison?
Yes. Comparison happens in your browser and neither file is uploaded.
Can I compare two scanned PDFs?
Text mode needs a text layer, so run OCR PDF on both files first, or use the visual overlay to spot differences on scanned pages.
Is comparing PDF files free?
Yes. You can compare free 3 times a day without signing up, and neither file is uploaded.