Protect PDF

Add AES password protection to your PDF files. Encrypt sensitive documents before sharing via email or cloud storage.

Add strong password protection to your PDF documents to prevent unauthorized access. Whether you need to encrypt sensitive business contracts before emailing them, protect personal financial documents stored in the cloud, or comply with data protection regulations that require document encryption, our protect tool adds AES encryption to your PDFs with a custom password. Only recipients with the correct password can open, view, or modify the document.

Drop a PDF file here or click to browse

PDF files only

Minimum 4 characters. Share this password securely with recipients.

About This Tool

Add strong password protection to your PDF documents to prevent unauthorized access. Whether you need to encrypt sensitive business contracts before emailing them, protect personal financial documents stored in the cloud, or comply with data protection regulations that require document encryption, our protect tool adds AES encryption to your PDFs with a custom password. Only recipients with the correct password can open, view, or modify the document.

How to Use

  1. 1Upload the PDF file you want to protect with a password.
  2. 2Enter a strong password that combines uppercase letters, lowercase letters, numbers, and special characters.
  3. 3Click "Protect PDF" to encrypt the document with your chosen password.
  4. 4Wait for encryption to complete. AES processing is fast and efficient.
  5. 5Download the protected PDF and verify it prompts for a password when opened.
  6. 6Share the password securely with authorized recipients through a separate communication channel.
  7. 7Store your password in a secure password manager — there is no password recovery option for encrypted PDFs.

Common Use Cases

Encrypt Business Contracts

Protect confidential business agreements, NDAs, and contracts before sharing via email or cloud storage.

Secure Financial Documents

Password-protect bank statements, tax returns, and investment reports stored digitally or shared with accountants.

Protect Personal Records

Encrypt sensitive personal documents — passports, medical records, legal documents — stored on cloud drives.

Compliance Documentation

Meet regulatory requirements that mandate encryption for documents containing personally identifiable information.

Safe File Transfers

Add a layer of security when sending PDFs through unencrypted channels like email attachments.

Key Benefits

Industry-Standard Encryption

AES-128 encryption ensures your PDFs are protected with the same standards used by enterprises worldwide.

No Software Installation

Everything runs in your browser. No need to buy Adobe Acrobat or install encryption software.

Permanent Document Security

Once encrypted, the PDF cannot be opened without the password wherever it is sent.

Regulatory Compliance Ready

Meet GDPR, HIPAA, and other data protection requirements that mandate encryption.

Pro Tips

  • Tip 1Use a minimum of 12 characters with a mix of uppercase, lowercase, numbers, and symbols for strong password security.
  • Tip 2Never share the password in the same email or message as the protected PDF. Use a separate channel for the password.
  • Tip 3Store the password in a reputable password manager. If the password is lost, the encrypted PDF cannot be recovered.
  • Tip 4Test the protected PDF by opening it with a different PDF reader to verify encryption works across applications.

Frequently Asked Questions

The tool supports AES-128 bit encryption, the industry-standard PDF encryption method recognized by Adobe Acrobat and all major PDF readers.

Supported Formats

PDF (.pdf)