PDF Password-Protection Status Checker
Check whether a PDF needs a password to open, or just restricts printing, copying and editing, and which encryption it uses. Your file never leaves your device.
About this tool
PDFs can be protected in two different ways. An open (user) password encrypts the file so it can't be read without the password. A permissions (owner) password lets anyone open the file but asks apps to block printing, copying or editing; many apps ignore that, so it's a polite request rather than real security. This tool tells the two apart by testing the empty open password the same way a PDF reader does, then lists the permissions the file sets.
It also names the encryption: AES-256 is current and strong, AES-128 is fine, and RC4 (especially 40-bit) is outdated and can be cracked quickly. It reads the standard PDF security handler used by Acrobat, Word, Preview and most other apps; certificate-based or enterprise rights management is detected but can't be inspected. The file is read entirely in your browser and is never uploaded, and the tool never tries to guess a real password.