PDF Password Encryptor
Encrypt your PDF files with a strong password using AES-256-GCM. All processing is 100% client-side - your files never leave your browser.
Select PDF
Drop a PDF here, or browse
PDF documents only
Set Password
Encryption Details
100% Private. Your PDF never leaves your device. All encryption is performed locally using the browser built-in Web Crypto API (AES-256-GCM). No data is uploaded or stored.
About PDF Password Lock
The PDF Password Lock is a professional, client-side utility built to perform high-fidelity conversions and data manipulations directly on your device. Powered by next-gen browser technologies like pdf-lib and Web Crypto SubtleCrypto PBKDF2/AES-GCM key derivation, the tool achieves lightning-fast processing speeds without needing a remote cloud backend. Lock and password protect PDF documents directly in your browser with strong encryption.
Our PDF Password Lock operates by reading your files or text inputs as raw byte buffers inside browser runtime scope. Rather than uploading payloads to a remote host, the application parses the structure in client-side memory. Specifically, it encrypts raw PDF byte arrays with AES-GCM using keys derived from user passwords via PBKDF2. This setup guarantees instant feedback, high-performance execution, and robust support for large file queues.
