Compress PDF shrinks a file on this device and downloads a smaller copy. Photos and scans shrink the most. A text-only PDF that is already small may barely change.
Open the result before you send it. If a photo looks too soft, run it again with less compression. The original file on your computer is left untouched.
Questions
Does compressing a PDF upload it?
No. The file is re-encoded in this browser tab. UtilityAll does not receive a copy.
Will the text turn blurry?
Text usually stays sharp. Photos and scanned pages are what get smaller, and they can look softer if you push the size down too far.