For PDFs you can already open
Bank statements, payslips and invoices often arrive locked with a password you know but resent typing — and locked PDFs break previews, search and some printers. This tool decrypts the file with the password you provide and saves an unencrypted copy, entirely in your browser. Neither the document nor the password leaves your device.
To be clear about what it is not: a password cracker. AES encryption cannot be bypassed, and tools that promise to "recover" a forgotten strong password are selling something impossible. Going the other way — adding protection — is the Protect PDF tool.