Here a list that contains sizes for Google Ads, AdRoll, and Linkedin Ads

Google

Display Responsive

(no text please – small or no logo)

• 1.91:1 (this will satisfy Linkedin Sponsored content as well)
• 1:1

Display

(under 150kb)

Requirements

• All ads must have a border
• The file size must be less than 150KB (does not apply to Display Responsive Ads)
• Ads cannot animate for more than 30 seconds

• Mobile:
  • 300×250
  • 320×50
  • 320×100
  • 250×250
  • 200×200
• Desktop:
  • 336×280
  • 728×90
  • 300×600
  • 160×600
  • 970×90
  • 468×60

AdRoll

• Static:
  • 300×250
  • 728×90
  • 160×600
  • 320×50
  • 970×250
  • 300×600
• Native:
  (no text please – small or no logo – under 150kb)
  • 600×600
  • 600×315
  • 600×500

Linkedin Sponsored Content

(no text please – small or no logo)

• 1.91:1 (this will satisfy Linkedin Sponsored content as well)
• 1:1