About ad sizes

Pick sizes that work
not just ones that fit

Why standard sizes matter

Publishers build their pages around a set of standard ad sizes defined by the IAB. Creatives in those sizes can run on far more inventory, so a campaign with the right set of sizes reaches more people for the same budget.

Start with the core sizes

The 300×250 medium rectangle, 728×90 leaderboard, 300×600 half page and 320×50 mobile leaderboard are among the most widely supported sizes, so they are a safe base for any display set. Add billboards, skyscrapers and mobile banners when you need more reach or more impact.

Design at 2× and check specs

Export images at double the slot size so banners stay sharp on high-density screens, then let the slot scale them down. File-size limits, HTML5 rules and animation length differ by DSP and publisher, so confirm the specs for each platform before final export.

Preview before launch

A banner that looks bold on its own can disappear next to page content. Check each size in a real layout with the ad preview tool, browse finished work in the Creative Showroom, and see every format AdGeeks runs in ad formats.

Frequently asked questions