Encrypt a PDF
Scramble a PDF with AES so only the password unlocks it.
Encrypting a PDF scrambles its contents so that, without the password, the file is unreadable even to someone who has a copy. This tool applies AES encryption in your browser, so the document is never uploaded to be encrypted.
How to encrypt a PDF
- 1
Add your PDF
Drop in the document you want to encrypt.
- 2
Set a password
The password becomes the key that decrypts the file.
- 3
Encrypt and download
Save the encrypted PDF, produced on your device.
Why encrypt on your device
Encryption is only as private as the moment before it is applied. Doing it locally means the unencrypted file is never uploaded, so there is no plain copy to intercept.
Frequently asked questions
What encryption standard is used?+
AES, the same industry-standard encryption used by major PDF software, applied locally in your browser.
Is the file uploaded to encrypt it?+
No. Encryption happens on your device, so the plain document is never transmitted.
Does encryption change the contents?+
No. The pages are unchanged; they are simply protected so the password is required to read them.
Is it free?+
Yes, with no sign-up.