Welcome to our Ad Size Guide, where we explain everything you need to know about the most prevalent ad sizes available within the world of online advertising. The IAB keeps a list of ad sizes here which it recommends to people, however as we at The Online Advertising Guide have a slightly different take to them, we thought it would be helpful to give our advice too.
In our Ad Size Guide we cover each ad size from the point of view of both people looking to sell advertising space on their site, and people thinking about buying online advertising and looking for advice. Every ad size contains both descriptions so that you can not only see what issues you have to consider and overcome from your point of view, but also what the person at the other end of the phone (or email) is thinking about too.
To start with we have a little bespoke overall advice for each group, so are you looking to sell ad space, or use online ads for marketing? Or are you trying to understand terms related to ad sizes?
If you think you already know it all, why not try our Display Ad Size Quizzes and prove it?
Best Desktop Ad Sizes
160×600 Wide Skyscraper 300×250 MPU / Med Rec 300×600 HPU 728×90 Leaderboard 970×250 Billboard
Best Mobile Ad Sizes
300×50 Mobile Banner 320×50 Mobile Leaderboard 320×100 Large Mobile Banner 320×480 Mobile Interstitial
Less Common Display Ad Sizes
120×60 Button 125×125 Button 970×90 Super Leaderboard
Site Takeovers
Sponsorships Homepage Takeover Reskin
Intrusive Ads
Overlay / Floater Pop Up / Pop Under
Other Types of Ad
In-Text Advertising Mobile Advertising Pre-Roll Advertising Skippable Ads
Old Display Ad Sizes
120×600 Skyscraper 336×280 Large Rectangle 468×60 Banner
Next: Ad Sizes for Ad Buyers