Password-protect a PDF

Encrypt a PDF with a password using real AES-256 — the same qpdf engine used on servers, compiled to run in your browser so neither the file nor the password ever leaves your machine.

Locked PDFs you own can be unlocked the same way: drop the file, enter its password, and work on it freely.

Real AES-256 encryption

Encrypt a PDF with a password using the same qpdf engine used on servers, compiled to run in your browser so neither the file nor the password ever leaves your machine. Locked PDFs you own can be unlocked the same way: drop the file, enter its password, and work on it freely.

Lock it as the last step

Encryption is best applied once a document is finished, because a locked PDF cannot be edited further. The workflow is simple: make all your changes, then protect the final file for sending. And since the password is what unlocks it, choose something you will remember — there is no recovery if it is lost.

How it works

  1. Drop a PDF and open Protect.
  2. Set a password.
  3. Download the encrypted copy.

Like every pixelpix tool, this runs 100% in your browser: your file is never uploaded to a server, never leaves your device, and works even offline once the page has loaded.

Frequently asked questions

How strong is the password protection?
It uses AES-256, the standard strong PDF encryption — the same algorithm server-side tools use.
Can I remove a password from a PDF I own?
Yes — drop the protected file, enter its password, and you can work on the unlocked document.
Does the password get sent anywhere?
No. Both the file and the password are handled entirely on your device.

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