🔒 PDF Lock
Add a password to your PDF – encrypted with AES‑256. Your file is processed on our secure server.
Drag & drop a PDF file here or click to select
Max file size: 100MB
Minimum 4 characters. Keep it safe – cannot be recovered.
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Your file is processed in memory and immediately deleted after encryption.
Secure transmission via HTTPS
Visit our Web Tools →❓ Frequently Asked Questions
What encryption is used?
AES‑256, the industry standard for strong encryption. Your password is never stored.
Is my file private?
Yes. The file is processed in memory on our server and never written to disk. It is deleted immediately after the encrypted PDF is generated.
What if I forget the password?
There is no way to recover the password. Keep it in a password manager.