Compress PDF
Make a PDF smaller for email and uploads. You see the new size before you save.
Your file is ready
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About Compress PDF
Shrink a PDF that is too big to email or upload. Lossless mode rewrites the file structure without touching what you see. Strong and Maximum modes turn each page into a compressed image, which makes scanned documents and photo-heavy PDFs much smaller.
How to compress a PDF
- Drop a PDF into the box, or click it to choose one.
- Pick a compression level: Lossless keeps everything; Strong or Maximum shrink scans the most.
- Click “Compress PDF” and check the new size.
- Click “Save Compressed PDF”.
Everything happens in your browser; nothing is uploaded. Very large files (over ~100 MB) can be slow on phones.
Frequently asked questions
Is my PDF uploaded to be compressed?
No. TrustPDF runs entirely in your web browser using JavaScript. Your file is read and processed on your own device and is never sent to a server. The site's Content-Security-Policy does not allow the page to send anything to any other site, and you can check the open-source code on GitHub.
Which compression level should I choose?
Start with Lossless. If the file is a scan or full of photos and is still too big, use Strong (150 DPI). Maximum (100 DPI) gives the smallest file and is fine for reading on screen.
Why is my text not selectable after strong compression?
Strong and Maximum turn each page into an image to save space. If you need selectable or searchable text, use Lossless.
Why did my PDF not get smaller?
Some PDFs are already well optimized. TrustPDF tells you when compression would not help instead of giving you a bigger file.
