Secure sensitive PDFs with password encryption before emailing or archiving.
Encrypt PDF files with user and owner passwords and granular permission controls 100% locally in your browser.
Is Client-Side PDF Password Protection & Encryption safe for confidential documents?
Yes. MantaPDF processes your PDFs 100% locally inside your browser memory using WebAssembly — zero bytes are ever uploaded to a server.
Does this PDF tool work offline without an internet connection?
Yes. Once loaded or installed as a PWA on your phone or laptop, all PDF operations run completely offline at native speed.