Lock PDF with Password – Free, No Sign‑Up
Add a password to any PDF using industry‑standard AES‑256 encryption. No software or account required – your file stays completely private on your device while it's being locked. Just set a strong password and download the encrypted PDF.
How to Password‑Protect a PDF
- Upload your PDF – Click the upload button or drag and drop the document you want to protect.
- Enter a strong password – Type your password in the input field. Use at least 12 characters with a mix of letters, numbers, and symbols for best security.
- Download the locked PDF – Click the lock button and your encrypted PDF will download instantly, secured with AES‑256.
Frequently Asked Questions
What kind of encryption does the tool use?
The PDF is locked with AES‑256 encryption, the same standard trusted by governments and banks. It's computationally infeasible to break without the password.
Are my password and file safe?
Yes. Everything runs in your browser. The password is never sent anywhere, and your original file is never uploaded. Only you have access.
Can I also disable printing or copying?
The locked PDF restricts printing to low resolution and disables copying and modification. These permissions are built into the encryption.
What if I forget the password?
There is no way to recover a lost password. Please store it somewhere safe – without it, the encrypted PDF cannot be opened.
Related Tools
🔒 Lock PDF with Password
Protect your PDF with a password — free, works in your browser!
Click here or drag & drop a PDF file
Upload your PDF to add password protection