- Read how to block certain ads
- Visit My Ad Center to control the information that Google uses to show you ads.
This article explains the options available to block ads based on the ad source of ads found using image search in the Ad review center. It also details the image requirements to identify the ad source.
Sources types
Ad Exchange
To block ads from this source type, click 
Bidding ad source
To block ads from this source type, click on the ad in the ad match results to find what bidding ad source provided the ad. Contact the bidding ad source directly to take action.
Supported bidding ad sources
Only the following bidding ad sources can be identified with image search in the Ad review center:
Campaigns
You can't block ads from campaigns in the Ad review center.
Image requirements to identify the ad source
You must upload an original PNG (not converted from another file format) if you want to identify matches from bidding ad sources. Don't modify the screenshot after it was taken. However, you can crop the screenshot to the ad as long as the entire ad is still visible.
Learn more about screenshots taken on Android and iOS devicesScreenshots taken on Android devices are automatically saved as PNG.
For screenshots taken on iOS devices, use the following steps to save as a PNG:
- Take a screenshot.
- Click Save to photos.
- Open the Photos app and click on the screenshot.
- On the screenshot, click
.
- Select the mail app.
- Send the image to yourself and select Actual Size for the image size, which will send the image as a PNG. Sending sizes other than Actual Size will send as JPG.