Reduce the size of a PDF so it is easier to email or upload. Photos and scans are saved again at a sensible quality and size, and leftover data is cleaned out.
PDFs with photos or scans often shrink by 50 to 90 percent. Text-only PDFs are usually small already.
No. Only images are compressed. Text stays sharp and searchable.
Then you get your original file back, so you never end up with a bigger file.
No. Everything happens in your own browser, on your own device. Your files are never sent to a server, so nobody else can see or keep them.