Roman Numeral Converter

Rates a password and estimates how long a brute-force attack would take, without sending it anywhere.

Encodes a username and password pair into the value of an HTTP Basic Authorization header.

Hashes a string with bcrypt at a chosen salt-round count and checks a string against an existing bcrypt hash.

Locks text with a passphrase using a symmetric cipher of your pick (AES, TripleDES, Rabbit, RC4) and reverses it.

Shows details your browser reports about the current device, such as screen size, pixel ratio and user agent.

Calculates Unix file permission values from read, write and execute checkboxes and shows the chmod command.