Compress, merge, split and convert PDFs right in the browser.
PDFs are the format people are handed rather than the one they chose, so the jobs are usually defensive: it is too big to send, it is three files that should be one, or it is forty pages when you needed four.
Merging and splitting happen in your browser — the document is read and rewritten locally, so a contract or a medical form goes nowhere near a server.
Leak Check is the one with a caveat, and it is a small one. It takes a file apart on your device like everything else here; only if you ask what a finding means does the text it recovered — not the file — get sent to be sorted by how much it matters.