This tool allows you to quickly identify issues that might be preventing an ad or extension from showing. It also lets you see how a Google search results page will appear for a specific search query. This way, you can check which ads and extensions appear for various keywords. Once you specify the search query and other parameters, such as language and geo-targeting settings, you will immediately see whether the ad will be shown under those conditions.
To use the ad preview and diagnosis tool, sign in to your Google Ads account and click on the tools icon in the top right corner 
. In the “Planning” section, click “Ad Preview and Diagnosis”. You can also go to google.com/AdPreview.
. In the “Planning” section, click “Ad Preview and Diagnosis”. You can also go to google.com/AdPreview.