Are my files uploaded to a remote server when adding a password?

No. PDF password encryption runs 100% locally inside your web browser. Your document content and passwords are never transmitted over the internet.

Which PDF viewers support the encrypted PDF files?

The encrypted PDF output uses standard 128-bit PDF encryption, which is fully compatible with Adobe Acrobat Reader, Google Chrome, Mozilla Firefox, Apple Preview, Microsoft Edge, and all standard PDF readers.

🔒 Client-Side PDF Security Utility

Add PDF Password & Protect PDF

Protect confidential financial reports, tax documents, and personal records with 128-bit PDF password encryption directly inside your web browser.

🔒

Select or Drop PDF File to Encrypt & Protect

Add high-grade 128-bit AES/RC4 password protection and set permissions for printing and copying directly in your browser.

Choose PDF Document

Why Password Protect PDF Documents Locally?

Online cloud converters require uploading unencrypted sensitive documents to external servers. SmartToolPack encrypts your PDF files 100% locally in browser WebAssembly memory. You can set custom passwords and configure granular permission flags for printing, copying, and editing.

Security Features

🔒 128-Bit Encryption

Industry-standard PDF security handler compatible with all major readers.

🛡️ Zero Server Uploads

Your document content and password never leave your device.

🖨️ Permission Controls

Restrict printing, content copying, or form editing as desired.

⚡ Instant Export

Downloads protected file immediately with zero server processing delay.