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
Best Mobile Ad Sizes
Less Common Display Ad Sizes
Other Types of Ad
Old Display Ad Sizes
Next: Ad Sizes for Ad Buyers