What it does :

JS::Minify shrinks your JavaScript to it's minimum possible size, speeding up your site and saving you bandwidth.

Options :

Minify - simply removes all unnecessary white space. Pack - Uses Dean Edwards compression tool to shrink and obfuscate your code. Pack generally provides smaller sizes.

How it works :

Just copy and paste your JavaScript into the text area and click the "Minify JS!" button. In a few moments your minified code is returned.