Unofficial Google Products Help Centre

It's an oft-seen question from publishers: Are we earning revenue for ad impressions or for ad clicks? The answer is that it depends on whether cost-per-impression (CPM) ads or cost-per-click (CPC) ads are appearing on your pages. By default, CPC ads will show on your site and you'll generate earnings for valid clicks on those ads. However, your ad units will display CPM ads when advertisers bid specifically on your site using site targeting , and for those ads you'll generate earnings with each valid impression. Please keep in mind that CPM earnings are not the same as the values you see in your eCPM column; your eCPM is only a reporting feature that can help you compare ad performance . To determine which type of ad you displayed on specific days, you can follow these instructions to generate a report. In your Advanced Reports, the ad type 'Site' refers to CPM ads, and 'Contextual' refers to CPC ads. Want to show more CPM ads on your site? It's not po...

Have you ever looked at your ad reports and noticed that your channel data and your aggregate data don't match, even for the same date range? You're not alone -- we often receive emails from publishers who are concerned about this issue, and we're happy to clarify what's going on. Depending on how you've set up your channels , you'll see a larger number of page impressions, clicks and earnings in your channel reports than your aggregate reports for any or all of the following reasons: Your ads are being tracked on multiple URL channels . Let's say you've set up 2 URL channels - one to track example.com and to track www.example.com/page . The URL channel example.com will track clicks and impressions from all subdomains, subdirectories, and subpages of example.com. As a result, one click on www.example.com/page will be tracked on both of your URL channels, which means you'll see two clicks recorded in your channel reports. However, your aggregate rep...

Here's an AdSense mystery worthy of intrepid detective Veronica Mars: Why are increases in clickthrough rate (CTR) sometimes accompanied by decreases in earnings per click? Occasionally, we hear from publishers who are perplexed that their earnings don't change despite an increase in CTR. This phenomenon can seem inexplicable, and when it happens, publishers may suspect that 'smart pricing' has taken effect, or that Google is making revenue share changes. What's really going on? AdSense is unique because it's designed to maximize eCPM for our publishers, taking into account both the advertiser's cost-per-click (CPC) bid and the likelihood that the ad will be clicked. Some ads are attractive to a broad range of site visitors and will be clicked on more frequently. While this can be great for your CTR, advertisers are often bidding less for these kinds of broadly targeted ads. Other ads are attractive only to a small niche of users. Advertisers will typical...