PDF Encrypt Tool

How to Use This Tool

1. Drop or browse for one PDF.
2. Enter a strong password (minimum 6 characters).
3. Click Encrypt and download the protected file.

Common Use Cases

• Sharing sensitive documents securely via email
• Password-protecting internal company files
• Securing stored archives before cloud upload
• Protecting personal documents like tax returns

Tips for Best Results

• Use a strong password with letters, numbers, and symbols.
• The password strength indicator helps you choose a secure password.
• Store the password separately from the encrypted file for security.

Frequently Asked Questions

What encryption algorithm is used?

AES-256-GCM with PBKDF2 key derivation (120,000 iterations).

Can I recover a forgotten password?

No. There is no backdoor or recovery option. Keep your password safe.

Is this the same as PDF password protection?

No — this encrypts the entire file bytes. Standard PDF viewer password is different.

Important Notes

• This uses AES-256-GCM encryption on the PDF bytes.
• The output is a JSON file; use the companion Unlock Tool with the same password to restore.
• Keep your password safe — there is no recovery mechanism.
• All tools run fully in your browser. Your files are not sent to our server.
• Safe and free to use: no login, no signup, no paywall.
• Libraries used: PDF-Lib (MIT), PDF.js (Apache 2.0), Mammoth.js (BSD-2), JSZip (MIT).
• If you find a bug, please report it in the comments.

Similar PDF Tools

• PDF Unlock Tool
• PDF Add Watermark Tool
• PDF Signature Tool
• PDF Metadata Editor