If you've poked around in your browser's settings, you've probably discovered an easy way to see what cookies are being stored on your system. For example, in IE 7, click Tools, Internet Options, then in the Browsing History section, click Settings, View Files. In Firefox, it's Tools, Options, Privacy, Cookies, View Cookies. If you haven't done a cleanup in a while, you'll probably find a pile of cookies waiting for you.
Cookies are just ASCII text files created via your browser by Web sites you visit. Some cookies are very useful, storing login information for the Web sites you frequent, the date of your last visit (so the site can flag newer information for you), your favorite search terms, and so on. These cookies are worth saving. Other cookies really only benefit Web advertisers, and can be deleted with no negative consequences to you. But how do you tell which cookies are which?
Because cookies are plain text files, they can be opened and read with Notepad. Even so, the data stored inside a cookie may not be very easy to figure out.
That's where a tool like Karen Kenworthy's free Cookie Viewer can help. Cookie Viewer works with Internet Explorer and Firefox cookies, and presents all of a cookie's data in a comprehensive but easy-to-understand way. You can see when the cookie was created, by whom, when it expires, and more. The program also lets you delete any cookies you don't want.
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Cookie Viewer lets you see all the data a cookie contains, so you can delete the ones you don't want.
Firefox users can also use any of several cookie-viewing add-ons, such as the free View Cookies download.
Once you know what cookies you want to keep, managing them becomes much simpler. For example, you can mark the cookies you want to keep as read-only, mass-delete the rest, and then clear the preserved cookies' read-only attribute.
Another alternative is to copy the cookies you want to preserve to a safe place, mass-delete the rest, and then copy the cookies back. If you have any skill with batch files or other scripting tools, you can easily automate this process.
There are also a huge number of cookie managers available for sale on the Web, but I've never found them particularly useful. As you can see from the above, managing cookies manually isn't particularly difficult. The first time you do it can be somewhat time-consuming, but subsequent cleanups can be easy and lightning-fast.
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How To Determine Which Cookies Can Be Deleted 
