In the same way that you regularly try out changes to your AdSense ads to increase your earnings, we're also constantly looking for new ways to help you earn more. We've been analyzing the performance of the three available font faces (Arial, Verdana, and Times New Roman), and have found that each font performs best in different ad formats due to factors like character width. Based on these findings, we'd like to let you know that we'll be updating some of the default font faces associated with specific ad formats within the next few days.

This upcoming change will only affect ad units in Latin-based characters which have 'AdSense default' selected as the font face. If you've set an account-wide font face, we hope our findings will encourage you to experiment with other font faces on an ad unit basis.

Currently, most ad units set to the AdSense default font face are displayed in Arial, with a few in Verdana. Here are the new default font faces we're launching for our ad units:
Arial: 728x90, 336x280, 120x600, 120x240
Verdana: 300x250, 160x600, 468x60, 250x250, 234x60, 125x125, 180x150
Times New Roman: 200x200
While we're optimizing the default font face based on performance across all AdSense sites, we also recommend experimenting on your own to determine the best font faces for your ad units and your sites. Just sign in to your account to manually select specific font faces on an ad unit or account-level basis.