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Add password protection to PDF files with encryption and security settings to control access and permissions.
Encrypt a PDF with a password using AES encryption — entirely in your browser. The file never leaves your device.
Real AES encryption, computed locally
Your PDF is encrypted in your browser and never uploaded. The password cannot be recovered if you lose it, so store it safely. Permissions are enforced by conforming PDF readers.
This tool adds real password protection to a PDF using AES encryption, all inside your browser. You choose a password, and the downloaded file is encrypted so that conforming PDF readers require that password before the document will open. Because the encryption happens locally in JavaScript, your file and your password are never uploaded to a server — nothing leaves the tab.
You can also set permissions that apply once the file is open: whether printing and copying text are allowed, and you can optionally flatten form fields or strip document metadata before encrypting. These permissions are enforced by standards-compliant PDF viewers.
One important caveat: password-based PDF encryption is only as strong as the password you choose, and there is no way to recover a lost password — if you forget it, the file cannot be opened. Choose a long, unique password and store it somewhere safe. For very high-stakes documents, a dedicated desktop tool such as qpdf or Acrobat can additionally target AES-256 explicitly.
Yes. It applies standard AES PDF encryption in your browser, so a compliant reader will prompt for the password before opening the file. The encryption is computed locally and the file is never uploaded.
No. Encryption is designed so that the document cannot be opened without the password, and there is no backdoor or reset. Store your password somewhere safe.
The password is required to open the document. Permissions — such as allowing printing or copying — control what a reader can do after the file is open, and are enforced by conforming PDF viewers.
The tool uses AES encryption; the exact key length depends on the PDF's version (commonly AES-128). For guaranteed AES-256, a desktop tool such as qpdf or Acrobat gives you explicit control.
No. Both the encryption and your password stay in your browser, so the document never leaves your device.