How it works
The SHA1 algorithm is used to compute a hash of data. It always produces a 40 character (160 bit) hash, regardless of the input string.
It is more secure than the MD5 algorithm, however it is considered insecure against determined attachers.
SHA1 is widely used in several protocols, including SSL, TLS, and PGP.
This online tool will allow you to SHA1 hash any string. It is completely client side and runs in the browser.