How to Password Protect a PDF File for Free

Secure your sensitive financial and personal documents by adding AES-256 password encryption directly in your browser.

Why Encrypt Your PDFs?

When emailing bank statements, tax returns, or legal contracts, sending an unprotected PDF is risky. If the email is intercepted or forwarded to the wrong person, your private data is exposed. Encrypting the PDF ensures that only the person with the password can open it.

Local Encryption Guarantee

Most online PDF lockers require you to upload your sensitive file to their server to encrypt it—defeating the purpose of security. Tuko performs the encryption entirely on your device using WebAssembly.

  1. Select the PDF you want to protect.
  2. Enter a strong password.
  3. Tuko uses standard PDF encryption to lock the file instantly.
  4. Download the locked file. Nobody (not even us) can access the content without the password.

Ready to try it?

Use our free Protect PDF tool to get your task done instantly and securely.

Open Protect PDF Tool

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