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Editorial Team
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Asked: 2026-06-16T12:25:36+00:00

I have been looking for a reliable css minifier that doesn’t require command line

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I have been looking for a reliable css minifier that doesn’t require command line to run. Something similar to Google closure compiler where you can input multiple JavaScript files and minify them into a single file. So far I have found this from this thread.

I fed it a few css files and found that one of the images referenced in one of the css files was mangled in the minified file.

background-image: url('/abc/img.png')

and it was converted to 

background-image: url(http://mydomain.com/'abc/img.png')

which doesn’t look right. Oddly enough if only a single file with above code is fed the outcome is correct. Also, if I change background-image to background, again the outcome is correct. So I am a little confused as what the problem is:

1 – Is it legal CSS to omit background-position when background-image is used?

2 – Are there any alternatives to this tool (accept multiple css files to minify and doesn’t require to be run as command).

Any other suggestions and insight is much appreciated.

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1 Answer

  1. Editorial Team

    1. The background shorthand can be safely used with only the color or only the image portion. I’ve been doing it this way since 2000~ because I’m lazy and never seen a problem. Of course, you could have tried asking the CSS validator to see if it was valid or not (see: http://jigsaw.w3.org/css-validator/).

    2. Personally, I let Sass take care of my minification needs since I’m already using it for its other features. I haven’t paid too much attention to how well it crushes the generated file, but all whitespace and comments are removed in its most compact mode and colors are compressed to their 6 or 3 digit hex values.

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