PDF passwords and permissions explained
Password protection can reduce accidental access, but permissions and encryption are not a substitute for careful sharing.
Opening passwords and owner permissions
A user password is required to open an encrypted PDF. An owner password controls permissions such as modification, copying and extraction. PDF Creator applies an opening password and restricts common modification and extraction actions in the protected copy.
Reader applications do not all enforce permissions in exactly the same way. Encryption protects access more reliably than a request such as ‘do not print.’ Treat permission flags as workflow controls rather than an absolute technical guarantee.
Choose and share passwords carefully
Use a unique password that is long enough to resist guessing. Do not put the password in the same email as the attachment when the document is sensitive. Share it through a separate trusted channel and confirm the recipient before sending.
PDF Creator processes the password with QPDF WebAssembly in the browser. The password and document are not submitted to the site, but the downloaded file still needs responsible storage.
Unlocking requires authorization
Removing protection is appropriate when you know the password and have the right to modify the file. The unlock tool is not a password recovery or bypass service. If the password is unknown, request an accessible copy from the document owner.
Always keep an unencrypted original in a controlled location. Losing the only password can make the document permanently inaccessible.