I have been doing a lot of Client-Side development recently and I have found these 7 tools of great help to improve the performance of the website by ‘shrinking’ the size of JavaScript and CSS files, referenced in the site.

JSMin (JavaScript Minifier) – removes comments and unnecessary whitespace from JavaScript files

JSO (JavaScript Optimizer) – allows you to manage your JavaScript and CSS resources and to reduce the amount of data transfered between the server and the client.

Packer – An online JavaScript Compressor

JSCompress.com – Online tool that uses either JSMin or Packer to compress your files

CSS Compressor – Online tool that compresses your CSS file

DigitalOverload JavaScript Minifier – Online tool that minifies your JavaScript files

and finally the one I use most frequently:

YUI Compressor – A JavaScript minifier designed to be 100% safe and yields a higher compression ratio than most other tools.