How to use Compress PDF
- Choose the PDF you want to make smaller.
- Pick how small: A little, Balanced, or As small as possible.
- Press Compress PDF and compare the new size before downloading.
Best for scans and photo-heavy documents
Email services and government portals often limit attachments to a few megabytes. AllInOnePDF rebuilds each page as an optimized image, which shrinks scanned documents dramatically. It tells you the before and after size, and if your PDF is already compact it says so, so you can keep the original.
Private by design
Compress PDF runs entirely in your browser. Your file is processed on your own device and is never uploaded to a server, there's no sign-up, and the result is ready to download as soon as it's done.
Questions
Why is my text no longer selectable after compressing?
Pages are rebuilt as images to save space. If you need selectable text, run PDF OCR on the compressed file.
Which level should I choose?
Balanced suits most documents. Use “As small as possible” when you must meet a strict size limit.
Is there a file-size limit?
There is no fixed limit. Very large files work best on a computer.