All advertisers can now start testing responsive search ads in their Microsoft Advertising accounts. With responsive search ads (RSAs), first introduced by Google last year, the ad systems automatically serve up a combination of headlines and descriptions provided by the advertiser.
What are RSAs? Advertisers can input up to 15 headlines and four description lines in each ad via the web interface, Editor, the bulk API, or you can import existing RSAs from your Google Ads campaigns. The ads are served dynamically in combinations of up to three titles and two descriptions.
An ad strength gauge appears in the RSA editing window as a rough indicator of RSA performance.



