Passwortschutz
AES-256-Verschlüsselung
Uses AES-256. Lose this password and the PDF cannot be recovered.
Über dieses Tool
Add or remove a password on a PDF. Adding a password locks the document so only people with the password can open it; removing strips the lock from a PDF you already know the password to.
Privvert uses AES-256 encryption - the modern PDF security standard - when adding a password. Both add and remove operations run in your browser, so the password and the unlocked document never leave your machine.
PDF password protection comes in two flavors: an open password that prevents the file from being viewed at all, and a permissions password that allows viewing but blocks printing, copying or editing. Privvert sets a 256-bit AES open password, which is the strongest standard PDF encryption and the only flavor that actually prevents a determined reader from extracting content.
Funktionen
- Add a strong open password (AES-256)
- Remove a known password from a locked PDF
- Browser-only - neither password nor document is uploaded
- Compatible with every modern PDF viewer
- No file size limit beyond browser memory
- Free, no signup, no watermark
So funktioniert's
- Drop in your PDF.
- To add a password: type a strong password and click Encrypt.
- To remove: type the existing password and click Decrypt.
- Download the result.
Alles passiert direkt in deinem Browser mit JavaScript und WebAssembly. Deine Dateien werden nie hochgeladen, nie gespeichert und nie von uns gesehen.
Häufig gestellte Fragen
No - AES-256 encryption is not reversible without the password. If you've forgotten it, your only options are dictionary or brute-force tools (slow, often unsuccessful for strong passwords).
Yes - the same AES-256 algorithm runs whether it's done locally or on a server. The advantage of doing it locally is that the unencrypted file and the password never go to a third party.
Currently only the open (user) password is supported. Owner passwords (which restrict printing/copying) are on the roadmap.
Encryption adds a small overhead (a few KB) for the encryption metadata; otherwise the file is essentially the same size.
256-bit AES with a long, random password is genuinely strong - brute-force is infeasible. The weak link is almost always the password itself: short or guessable passwords (the user's birthday, '12345678', etc.) fall to dictionary attacks in seconds. See the passwords article for what 'long enough' actually means.
An open password blocks viewing entirely. A permissions password lets anyone view but tries to block printing, copying or editing. Permissions passwords are weak by design - any PDF reader can ignore them - so they are best treated as a polite request, not security.