Adsense is very atractive way to make money online and ever step of the designing of your adsense ad is about choices. By testing you will learn what works best on your sites and the first thing you will want to try out is choosing the ad format for text and image based ads. The right format depends on where you want to put the ad on your site
The first format that you will want to take a look at is the famous leaderboard ad format with a 728 x 90 size. This is obviously a large ad format and therefor only suited for places where you have lots of space like the header or footer of your page. This is a very popular format with 4 ad units and it seems that it converts rather well on most sites
The next banner ad layout is the 468 x 60 pixels ad. This is a typical banner design that can be placed almost everywhere. This ad displays 2 ads one alongside the other. The half banner obviously is half the size of the full banner and it's format is 234 x 60 pixels holding only 1 ad. These are the horizontal banners but adsense also has some vertical designs the first one being the 120 x 240 pixels
For the small type of ads that go in tight spots on your site you can use the buttons with the 125 x 125 square size holding 1 single ad. This is a perfect spot to showcase a single ad if you combine the ad with an atractive backgound color
If you need ads to be shown on one or either side of your content a skyscraper holding 3 or 4 ads can be the solution. The skyscraper was specificaly designed for this purpose and its format is 120 x 600 pixels. If you would like to have more space for ads choose the 160 x 600 wide sky scraper because this one can hold 5 ads
Several rectangle formats are used for in content display. The first one of them is the 180 x 150 pixels small rectangle holding one ad. The medium formt holds 3 or 4 ads in a 300 x 250 pixels layout and the large rectangle ad unit is measuring 336 x 280 pixels for up to 4 ads. The second square rectangle measures 250 x 250 and can also hold video ads
If you use image-based Adsense ads, you can choose the Leader Board which you will find placed across the top of many websites. It measures 728 X 90. The Banner is a smaller ad that measure 468 X 60. The Sky Scraper and Wide Sky Scraper are also choices for use on the sides of a webpage. Or you can choose the Medium Rectangle format. All of these image ads hold a single image.
There are also various layouts for displaying Link Unit Adsense ads so that they will fit well into your website also. They can be stacked, lined up across the top or bottom and allow just as much variety as the text and image ads.