The free Protect and Unlock PDF tool keeps your documents secure using encryption, all in your browser. In Protect mode: upload a PDF, enter a password, and click to create a password-protected copy. Anyone who opens the new file will need the password. This is essential for contracts, confidential reports, tax documents, or any sensitive file you share by email or cloud. The encryption is done locally with pdf-lib; your file is never sent to a server.

In Unlock mode: upload a password-protected PDF and enter the correct password. The tool decrypts the file and lets you download a copy without a password, so you can open it easily later or edit it in other software. Use this when you no longer need protection or when the recipient has trouble opening encrypted files. Decryption also runs entirely in your browser; your document and password never leave your device.

Document encryption is a best practice for sensitive data. This tool gives you a simple way to add or remove PDF passwords without desktop software or online services that store your files. Ideal for professionals, legal and HR documents, and anyone who cares about privacy. No account required; your files stay under your control.