Format.w

Width of this allowed size in device-independent pixels. Marked recommended in 2.4; from 2.5 the spec instead recommends either the w and h pair or the ratio set.

CurrentintegerOptionalSince 2.4

Field facts

Path: imp.banner.format.w, imp.audio.companionad.format.w, imp.video.companionad.format.w
Object: Format
Type: integer
Requirement: Optional
Added: OpenRTB 2.4
Spec section: 3.2.10

Example

Where the field sits in a payload, with everything else left out:

{
  "id": "req-1",
  "imp": [
    {
      "banner": {
        "format": [
          {
            "w": 300
          }
        ]
      }
    }
  ]
}

Common mistakes

Sending physical pixels from a high-density screen, such as 600 for a 300 wide slot.
Sending a size string such as "300x250" in place of separate integer w and h fields.

Version history

Added in OpenRTB 2.4, and present in the latest snapshot. The table shows how each version's spec text types the field.

Versions	Type in the spec	Required	Deprecated
2.4	integer	Recommended	No
2.5 to 2.6-202606	integer	No	No