What are some good css and js minimizers for production code? [closed]

YUI Compressor does both JavaScript and CSS. I'm not sure if you can send it a batch of files.

You can batch process at YUI Compressor Online (yui.2clics.net), though that version only accepts JavaScript. Another Online YUI Compressor (refresh-sf.com) accepts CSS, too, but doesn't batch.

In terms of comparing the various minifiers, see jQuery : Frequently Asked Questions (FAQ) : How do I compress my code? Also, check out Microsoft Ajax Minifier.

jQuery has switched from the YUI Compressor to Google's Closure Compiler for the minified version that they distribute.

YUI Compressor is pretty cool. You can run it as part of a build process from the command line

Take a look at The JavaScript CompressorRater. It does live comparisons of various minifiers (with and without gzip compression) for any JavaScript you supply it.

It also (mostly) works with CSS, though not all minifiers support it and not even all of those that do (e.g. YUI) show up correctly in the comparison table.