Creative Size Specifications

A size specification is a delivery geometry: the aspect ratio and size range a surface will accept.

Its size specifications— 11

• PortraitA portrait delivery geometry, taller than it is wide, for feed-native placement.
• LandscapeA landscape delivery geometry, wider than it is tall, for responsive display and social placement.
• VerticalA full-height vertical delivery geometry for story, reel and vertical video placement.
• WidescreenA widescreen delivery geometry for a video player rendition.
• Landscape LogoA landscape delivery geometry reserved for a logo asset in responsive display.
• Inline RectangleA fixed rectangular display geometry placed inline within page content.
• Half PageA fixed tall display geometry occupying half the page height.
• LeaderboardA fixed wide display geometry placed across the top of a desktop page.
• Mobile BannerA fixed narrow display geometry sized for a mobile viewport.
• BillboardA fixed oversized display geometry placed above desktop page content.
• Email Content WidthThe canvas width an email module is composed against.

Why it matters

What goes wrong without it, as the commitments that license this kind say it, each standing on its sources.

• Keep concrete creative separate from its classificationsA creative asset is one addressable thing that exists in a system of record. Its format, the role it plays, what is visible in it and the geometry it is delivered at are all descriptions of it, and each belongs to a different vocabulary. Folded into the asset they produce a record that is part file and part category, and can be neither counted nor found.
  DCMI Metadata Terms · IAB New Ad Portfolio: Advertising Creative Guidelines
• Creative form is constrained by where it is deliveredA size is a property of a placement, not of a picture. Recorded on the asset it makes a creative look as though it has an intrinsic shape, and the constraint it was actually meeting — what a given surface supports — goes unrecorded. Stated against the surface, one asset can be delivered anywhere that supports it.
  IAB New Ad Portfolio: Advertising Creative Guidelines