Encrypt PDF
Password protect your PDF files for free. Add a secure password to any PDF document right in your browser. No uploads, no servers — 100% private.
Encrypt PDF
Password protect your PDF Document
Click here or drag & drop
🚀 Why Use Our Encrypt PDF Tool?
Secure your sensitive PDF documents with robust RC4 128-bit password encryption to prevent unauthorized access.
Encryption happens entirely in your browser. Your files and passwords never leave your device.
Quickly apply password protection without waiting for risky cloud uploads and processing times.
⚙️ How to Password Protect a PDF
Upload the PDF file you wish to lock and protect from your device.
Enter and confirm a strong, secure password that will be required to open the file.
Hit the "Lock PDF" button and instantly download your encrypted, protected document.
Bank-Grade PC Security
Protecting your sensitive information is critical. Our PDF encryption tool uses robust 128-bit encryption to scramble the contents of your document, ensuring that only individuals who know the exact password can view, print, or modify the file.
True Zero-Knowledge
We pride ourselves on offering a "zero-knowledge" security model. This means that neither your PDF file nor the password you type is ever uploaded to a server or stored in a database. The entire cryptographic process happens safely inside your browser.
Prevent Unauthorized Access
Whether you're sharing financial spreadsheets, medical records, or confidential contracts via email, adding a strong password layer ensures that even if file interception occurs, the internal data remains completely unreadable and fully protected.