Protect PDF Files Online

Add AES-256 password encryption to your PDF in seconds.

Select a PDF file

or drop your PDF here

File to protect

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Minimum 6 characters. Use letters, numbers, and symbols for a stronger password.

Encrypting your PDF…

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PDF Protected Successfully!

Your encrypted PDF is ready. Keep your password safe — it cannot be recovered.

How to Securely Protect a PDF with a Password

  1. Select the PDF document you want to encrypt.
  2. Type a strong password and confirm it to ensure maximum security.
  3. Click Protect PDF to apply AES-256 military-grade encryption.
  4. Download your locked PDF file, accessible only with the correct password.

AES-256 Encryption

PDFClever applies industry-standard AES-256 bit encryption — the same standard used by banks and governments worldwide. Your password is never stored on our servers; only the encrypted file ever leaves your device.