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Compare PDF
Show a side-by-side comparison and spot visual and text changes between two PDFs.
or drop files here
Processed locally in your browser — nothing is uploaded.
How to Compare PDF
- Choose your file or drop it into the box above.
- Adjust the options if you need to.
- Click the button and download your result.
Frequently asked questions
Is Compare PDF free?
Yes. Compare PDF on PDF Sky is completely free, with no limits, no watermarks and no sign-up.
Are my files uploaded to a server?
No. Your files are processed directly in your browser and never leave your device.
Does it work on my phone?
Yes. PDF Sky works in any modern browser on Windows, Mac, Linux, iPhone and Android.