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With a fresh start to the year, now is a great time to review your AdSense strategy to ensure you’re making the most out of your ads. With that in mind, we’re kicking off a two-part optimization checklist series to help you increase your earning potential. In this first post, we’ll review some oldie-but-goodie tips; take a look, check off the items that you’ve already covered, and see if there’s anything you may have missed.

1. Increase ad coverage: Placing additional ad units on your site can have a big impact on your earnings. You can put up to three standard AdSense for content ad units (note only one 300x600), three link units and two AdSense for search boxes on each page of your site. Sometimes publishers find it difficult to decide whether an additional ad unit makes sense for their site. Watch this short video to help you make sure you're following best practices, as outlined on Google’s Webmaster Guidelines, when placing new ad units on your site. As always, it’s important to consider the amount of ads in relation to the quality content on your site.
2. Use recommended ad sizes: As a rule of thumb, wider ad sizes tend to outperform their taller counterparts, due to their reader-friendly format. If positioned well, wide ad sizes can increase your earnings significantly. The sizes we've found to be the most effective are the 728X90 Leaderboard, the 336x280 Large Rectangle, the 300x250 Medium Rectangle, and the 160x600 Wide Skyscraper. Keep in mind that while these ad sizes typically perform well, you should use the size that best complements your pages.
3. Show both text and image ads: Image ads compete in the same auction for your ad space that text ads do. So, choosing to display both text and image ads increases the competition for ads to appear on your site, and may help you earn more. Check this case study to see how displaying both text and image ads helped one publisher. You can also find instructions how to enable image ads in our Help Center.
4. Experiment with ad color combinations: Choosing the right ad styles can mean the difference between ads your users will notice -- and click -- and ads they'll skip right over. There are three techniques you can use to design ad styles that will be successful for your site: blend, compliment and contrast.  Experiment with ad color combinations to find the best fit for your site. See this Help Center article for additional information.
5. Ensure optimal ad placement: The placement of your ads plays a big role in revenue earning potential and user experience. While we often recommend placing an ad above the fold, it’s also important that users can easily find the content they are looking for. Check out this resource for more tips on ad placement, and see our heat map for even more information.
6. Add a search box (or two): As mentioned in #1, you can put up two AdSense for search boxes (along with three standard AdSense for content ad units and three link units) on each page of your site.  AdSense for search is a free product that lets you place a Custom Search Engine on your site to provide users with web search. You'll also earn revenue from relevant ads on the search results page.

We hope you find these tips useful. If you have additional tips to share, or would like to let us know about your experience with using an optimization tip, leave a comment on our AdSense +page. Stay tuned for our second part of the series, where we’ll cover some advanced optimization tips.

Posted by Jamie Firkus - Inside AdSense Team