Google Adsense Preview Tool will display contextual and geo-targeted Google AdSense ads for any website (e.g., cnn.com) or keywords (e.g., airline tickets) based on standard AdSense targeting and filtering.
It uses your default geographic location (based on your IP address) for geo-targeting but you can also choose a different country from the dropdown.
Unlike the Official Adsense registry add-on that works only with IE browser, this online Adsense Preview Tool works across all web browsers including Google Chrome, IE, Firefox, Opera and Safari.
If this tool fails to display ads for a particular keyword or web domain, chances are that it is a restricted keyword or the domain is not part of the AdSense program.
Google ads are restricted on domains and web pages that include adult or mature, gambling-related, copyrighted, violent, or hateful content.
The AdSense Preview tool supports text ads (CPC), image ads, rich media ads (Flash) and Ad Link units in all standard ad formats including Leaderboard (728x90), Skyscraper (120x600 & 160x600), Rectangle (336x280 & 300x250) and Square (200x200)
The internal code uses random Adsense Publisher IDs with ad_test set to "ON" and therefore the Adwords advertisers will be not be charged for any clicks or ad impressions generated through this tool.
The official AdSense Preview tool is only compatible with IE while this one works across all browsers. It displays Image, Text, Flash and HTML (Rich Media) ads in all supported IAB formats.
You can use this tool to determine if a domain is banned in the AdSense program. Put the website URL in the input box and if you see no ads, Google may have disabled ad-serving for that domain.
With Google DFP, you can easily serve AdSense Ads on your site alongside direct advertisements. You also have the option to server in-house ads when the AdSense Ads have a low eCPM.