Protect PDF

Our Protect PDF tool allows you to encrypt your documents with a strong password. This prevents unauthorized access to sensitive information, ensuring only people with the password can open and view the file.

Choose a PDF File

Or drop your PDF file here

Secure Your PDF with a Password

Our Protect PDF tool allows you to encrypt your documents with a strong password. This prevents unauthorized access to sensitive information, ensuring only people with the password can open and view the file.

The encryption process uses industry-standard AES cryptography and runs entirely within your web browser. This means your private documents are never uploaded to any external server, guaranteeing total confidentiality.

Key features

  • 100% Client-Side Encryption We use advanced Web technologies to encrypt your PDF locally on your device. Your data never leaves your browser.
  • Strong AES Encryption Your documents are protected using robust AES-256 encryption, the standard for securing sensitive data.
  • Instant Processing Since there are no server uploads or downloads, your encrypted PDF is generated in milliseconds.
  • Completely Free No hidden costs, no file size limits, and no registration required.

How to Password Protect a PDF

Follow these simple steps to encrypt your PDF document.

  1. Upload File Click the upload area or drag and drop your PDF file into the dropzone.
  2. Enter Password Type the secure password you want to use to lock the document.
  3. Confirm Password Type the password again to ensure there are no typos.
  4. Encrypt Click "Protect PDF" and download your newly secured file.

Usage tips

  • Use a strong password combining letters, numbers, and symbols for maximum security.
  • Keep your password safe. If you forget it, the document cannot be recovered or decrypted.
  • Protected PDFs will prompt anyone who opens them to enter the password before displaying any content.

Frequently asked questions

No. All processing happens entirely within your web browser. We never upload, store, or see your files or passwords.
We utilize strong AES (Advanced Encryption Standard) encryption, ensuring your documents remain secure against unauthorized access.
You can unlock the PDF using a PDF unlocking tool, provided you still know the correct password.