Can this password be bypassed?
No. The document is encrypted using industry-standard structural encryption protocols. Without the correct password, PDF readers cannot decipher the internal layout.
🔒 Military-Grade Security
Protect PDF
Lock your critical documents with a password. Secure, 100% private client-side encryption that never leaves your device.
Step 1: Upload PDFs
Drop PDFs to lock
Select documents to start encryption
Step 3: Download Protected PDFs
Process your files in Step 2 to see results here.
Add Password to PDF Documents Securely
Ensure your sensitive information stays private with our Protect PDF tool. Whether you're sending financial records, legal contracts, or personal health information via email, applying a password prevents unauthorized viewing.
How Our Browser-Based Encryption Works
Unlike other services that upload your highly sensitive documents to their remote servers to apply a lock, our tool processes the entire security layer directly inside your web browser. This zero-trust architecture means your private data never leaves your device.
Important Considerations
To achieve this extreme level of privacy without relying on compromised server extensions, this tool flattens the document (rendering it as high-definition images) before applying the locking algorithm. While this ensures perfect visual integrity across all devices and thwarts text-extraction scripts, it does mean the text cannot be copy-pasted by the recipient.
Frequently Asked Questions
Do you store my password?
Absolutely not. We do not store your documents or your passwords. The entire process happens in your computer's active memory.
Why is the text no longer selectable?
To protect your document securely entirely within your browser (without risky server uploads), we flatten the layout into an encrypted image container. This safely locks the file while guaranteeing visual accuracy.