Bing AdCenter Limits

• 100 accounts per customer
• 10,000 campaigns per account
• 10,000 ad groups per campaign
• 20 ads per ad group
• 10,000 keywords per ad group

Negative Keyword Limits

• Campaign and ad group level: Each negative keyword can contain up to 100 characters, and the entire list can be up to 10,000 negative keywords total.
• Keyword level: Each negative keyword can contain up to 100 characters, and the entire list can contain up to 1,024 characters, including commas.

Targeting Limits

255 targets per campaign or ad group (255 is the limit for all combined targeting settings which include Geographic, Day of Week, Hours of Day, Demographic, Device)

Site Exclusion Limits

500 sites for each campaign and ad group