Banner.wmin

Minimum width in pixels, added in OpenRTB 2.2 to signal that a range of sizes was acceptable. Deprecated in 2.4 in favor of Banner.format and removed in 2.6.

Removed after 2.5integerOptionalSince 2.2

Field facts

Path: imp.banner.wmin, imp.audio.companionad.wmin, imp.video.companionad.wmin
Object: Banner
Type: integer
Requirement: Optional
Added: OpenRTB 2.2
Deprecated: OpenRTB 2.4
Last version: OpenRTB 2.5
Spec section: 3.2.6

How it is used

In 2.2 and 2.3, sending any of the min or max fields turned Banner.w and Banner.h into a preferred size instead of an exact one. For a slot that scales with its container, use a ratio Format with Format.wratio, Format.hratio, and Format.wmin instead. That Format.wmin is a different field: it sets the smallest rendering of a ratio, not the bottom of a size range.

Example

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

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

Common mistakes

Still sending it on 2.6 traffic. The validator reports openrtb.field.removed, or openrtb.field.deprecated when the request is validated against 2.4 or 2.5.

Version history

Added in OpenRTB 2.2, deprecated in 2.4, last present in 2.5. The table shows how each version's spec text types the field.

Versions	Type in the spec	Required	Deprecated
2.2	integer	No	No
2.3 to 2.3.1	integer	No	No
2.4	integer	No	Yes
2.5	integer	No	Yes