Google has launched Ad Sitelinks for all AdWords campaigns. The feature was made available late last year for advertisers’ top performing ads, but is now available via a one-line format for all campaigns.

Google says advertisers who have used the format in the past have experienced big gains, and have boosted clickthrough rates by over 30% (on average).

"When a user’s query matches a keyword in your Ad Sitelinks-enabled campaign, Google will automatically determine if your ad qualifies to show Ad Sitelinks and whether to show the two-line or the one-line format based on the quality of that ad," says Dan Friedman of Google’s Inside AdWords Crew. "Ads that currently qualify for the two-line format will not be affected by the addition of the new one-line format."

"You should keep in mind that Ad Sitelinks is a campaign-level extension, so the links you create should be relevant to any ad in that campaign," Friedman adds.

Advertisers can set up ad sitelinks for their campaigns by finding the option in the Campaign Settings tab in their AdWords accounts. It’s listed as "Show additional links to my site" in the "Ad Extensions" section.