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I am accessing some web sites which are really really slow, and I would like to know if those sites are gzipped. Is there an easy way to find this out?

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3 Answers 3

up vote 38 down vote accepted

If you're using Chrome, you can open the developer tools (in the wrench menu: Tools > Developer tools, or alternatively by pressing CtrlShiftI.

Once you have the developer tools open, you can click on the Network tab, and do a refresh on the page. If you then click on the top entry in the list and select Headers on the right side, it'll list all the response headers for the page.

If you find Content-Encoding: gzip in the list, then the page is gzip-compressed.

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And here is another gzip checker: gzipWTF

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If you dont have Chrome installed here are some alternatives:

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