100% Local Processing

Lock or Unlock PDF — Offline & Private

Password-protect a PDF or remove existing protection. 128-bit AES encryption runs entirely in your browser.

100% Offline Processing

Encrypt or Decrypt PDFs Without Sending Them to a Server

Encrypting a sensitive document by first uploading it to a service is a fundamental contradiction — you're exposing the content you're trying to protect during the very act of protecting it. OfflinePDF encrypts PDFs using 128-bit AES applied by the pdf-lib library running directly in your browser's JavaScript engine. The unencrypted version never travels to any server. You set the password, the library applies the cipher locally, and the protected file downloads from browser memory.

🔐 128-bit AES Encryption
Industry-standard AES encryption applied locally by pdf-lib. No external cryptography service involved.
🔓 Password Removal
Remove an existing password from a PDF you own by entering the current password. The unlocked version never leaves your device.
🛡️ True Confidentiality
The unencrypted content is never transmitted. Compare that to server-based encryptors that must receive the plaintext to encrypt it.
🆓 Free With No Restrictions
Encrypt any file size, remove passwords from any document. No account, no limit.

OfflinePDF vs Typical Online Tools

FeatureOfflinePDFTypical Online Tools
Uploads the unencrypted PDFNeverAlways
Local AES encryptionYes — in browserServer-side
Password removal locallyYesServer-side
Works without internetYesNo
No account requiredYesOften required

Frequently Asked Questions

The tool applies 128-bit AES encryption, which is the standard used in PDF security and sufficient for most use cases. Modern PDF readers enforce this encryption layer.

No. Password removal requires entering the current correct password. This tool cannot crack or bypass encryption.

AES-encrypted PDFs are supported by Adobe Reader, Preview (macOS), and all major PDF readers.