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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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up vote 71 down vote accepted

If you're using Chrome or Firefox, you can open the developer tools and see it.

  • In Chrome, this is done from the wrench menu: Tools > Developer tools, or alternatively by pressing CtrlShiftI.
  • In Firefox, click the menu button: Developer > Inspector, or alternatively by pressing CtrlShiftC.

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.

Here's what it looks like in Chrome:

Screenshot of the Chrome inspector.

Here's what it looks like in Firefox: Screenshot of the Firefox inspector.

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Presumably the reported size is after gzipping ? – Damon Apr 20 at 16:24

And here is another gzip checker: gzipWTF

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Does this actually tell you if the site you're testing is gzipped? From what I can gather, it only shows info on the resource URIs, which may not even come from the target site (eg CDNs). – Dan Atkinson Apr 6 at 13:18

If you dont have Chrome installed here are some alternatives:

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