For PDFs you own: enter the password you know, and get an unlocked copy for easier use. Nothing is uploaded.
PDFs carry two different passwords. The owner password restricts actions, printing, copying, editing, while the document itself opens freely; the user password is required just to open the file. This tool handles both, differently: for owner-restricted files it loads the document structure and saves a clean copy with restrictions gone (the content was never actually encrypted against opening). For user-password files, you supply the password you legitimately know; the pages are then rendered and rebuilt into a fresh, unlocked PDF.
Authorization, stated plainly: use this only on PDFs you own or are authorized to modify. It cannot and does not guess, crack or bypass unknown passwords, there is deliberately no password-recovery function, and files with strong encryption whose password you do not know are simply out of reach, which is the point of the protection. One trade-off to know for the password path: the rebuilt PDF is image-based, pages look identical and print perfectly, but text is no longer selectable or searchable. The owner-restriction path keeps text fully intact.
I forgot the password entirely, can this find it? No. Password recovery is explicitly not offered: there is no guessing, dictionary or brute-force function. If the document is yours, the issuing organization (bank, agency) can usually re-issue it.
Will quality suffer on the password path? Pages are rendered at high resolution, so print quality is preserved; the loss is functional (no text selection/search), and it is disclosed because it matters for long documents.
Is it legal to remove an owner password? For documents you own or have rights to, removing printing/copy restrictions is a normal document-management task in most places. Circumventing access controls on others' protected works is where law (and this tool's design) draws the line.