For your ad to pass review it MUST adhere to the following guidelines:
- All ads must have a visible logo/brand or domain on them.
- Ad sizes supported: 320x50 for mobile banner ads, 320x480 and 480x320 for interstitial ads.
- All ads must be a .gif, .png, or .jpg file and less than 70kb in file size.
- All ads must have a border or a colored edge.
- Ads can't have animation lasting longer than 30 seconds.
- Your ads must adhere to the Advertiser Quality Guidelines.