Online JavaScript/CSS Compression Using YUI Compressor

Select a file you want to compress. This tool uses YUI Compressor 2.4.2.

To use, copy/paste your code into the text area or select a file to upload. Then choose your compression type, JS or CSS. Finally, press the compress button.

Compress a JS/CSS code block or file
  • Global Options
    JavaScript Options

    Further Reading

    Better JavaScript Minification
    In my investigation, I discovered coding patterns that prevented YUI Compressor from performing variable name replacement. By modifying or avoiding these coding patterns, you can improve the YUI Compressor’s performance.
    Helping the YUI Compressor
    Running your JavaScript code through YUI Compressor results in tremendous savings by default, but there are things you can do to increase the byte savings even further.
    Minification vs Obfuscation
    A minifier removes the comments and unnecessary whitespace from a program. Depending on how the program is written, this can reduce the size by about half. An obfuscator also minifies, but it will also make modifications to the program, changing the names of variables, functions, and members, making the program much harder to understand, and further reducing its size in the bargain.
    The Elements of JavaScript Style [ Part 1 | Part 2 ]
    When we talk of style here, we are not talking about fads and fashions, nor are we talking about CSS or conventions of layout or typography. We are talking about timeless qualities of expression which can substantially increase the value of a codebase. For companies whose valuations are are inextricably bound to their codebases, style should be a vital concern.

    A note on Privacy

    Every bit of code entered into this tool is made into a file on my server. That file is fed into the YUI Compressor which outputs a compressed version of that file. The original code is removed immediately from the server, but the compressed file sticks around for a while so you can download it. The idea is to purge these files with a cron script but I’m not smart enough to write one, so ultimately the compressed files hang around until I purge them myself.

    I made my php class public a while ago. You can see what’s going on here: http://github.com/gpbmike/PHP-YUI-Compressor

    I don’t read or copy any of your code. You’ll just have to take my word for it I guess.

    Changelog

    April 22, 2010
    • Use the php class I wrote for the yui compressor.
    • Privacy 'policy'
    December 13, 2009
    • Download compressed file.
    May 30, 2009
    • jump to output after compression
    • upload multiple files
    March 10, 2009
    • fix multi-byte character handling. (thanks Alex)
    January 18, 2009
    • changed to YUI compressor 2.4.2
    • added line-break option
    • added verbose option
    November 7, 2008
    • changed to YUI Compressor 2.4.1
    • added some links to further reading
    • fixed utf-8 encoding
    October 7, 2008
    • valid HTML markup for kicks
    October 4, 2008
    • added error reporting
    • escape compressed code
    October 2, 2008
    • changed to YUI Compressor 2.3.6
    • stopped escaping double quotes
    • hide command

    Todo

    If you have any feedback, or have a feature request, hit me up at gpbmike@gmail.com.