CSS Compressor
If you have a big CSS file and want it to be compressed, remove comments and whitespaces to make it seen as one-liner code, then CSS Compressor tool can help.
Following is the web where you can compress your CSS as well as HTML codes:
http://tools.arantius.com/css-compressor
CSS Uncompressor or CSS Beautifier or CSS Tabifier
On the other end, if you want your CSS code to be uncompressed, beautify and tabify, to make it look like a real code, with lines and functions sort of environment, then try the following URL for beautifying your code: