These are one of the most important factors involved in getting low or high CTR.
- Try to put AdSense ads around your content and above the fold.
- Above-the-fold ads perform far better than below-the-fold ads
- Match the colors of the ads to your site colors
Bloggers are often ignoring link-based ads. Link-based ads are different from banner ads, and they don’t decrease the CTR of main ads if optimized properly. I usually prefer to keep these types of ads on the header navbar.
When you are designing a website for Adsense income, you should generate a heatmap of your site to get know where your visitors are clicking most often. Create ads in near of these click hotspots.
The best performing ad units:
- 336 * 280 Large Rectangle
- 300*250 Medium Rectangle
- 728*90 Leaderboard
- 160*600 Wide Skyscrapper
You find more effective AdSense banner sizes and their explanations here: https://wpquads.com/effective-adsense-banner-size-formats/