How to use Compress PDF
- Choose a PDF or drop it into the box.
- Pick Smallest file, Balanced or High quality. Tick grayscale to save even more space.
- Tap Compress PDF and download the smaller file.
Which PDFs compress best?
Scanned documents and PDFs full of photos shrink the most, often by more than half. The tool redraws each page as an optimised image and rebuilds the PDF, all on your device.
Because the pages become images, text in the compressed file can't be selected or searched. Keep your original if you need that, and use Balanced or High quality for documents with small print.
Frequently asked questions
Why didn't my PDF get smaller?
PDFs that are mostly plain text are already compact. Turning their pages into images can make them larger, and the tool tells you when that happens.
Is there a page or size limit?
There is no fixed limit, but very long or large PDFs can take a while on phones because all the work happens on your device.
Can I compress a password-protected PDF?
No. Remove the password in a PDF reader first, then compress the file.