Format.wmin
Minimum width in device-independent pixels at which a ratio-sized ad will be shown. It applies only to ratio Formats. Added in OpenRTB 2.5.
Field facts
- Path
imp.banner.format.wmin,imp.audio.companionad.format.wmin,imp.video.companionad.format.wmin- Object
- Format
- Type
- integer
- Requirement
- Optional
- Added
- OpenRTB 2.5
- Spec section
- 3.2.10
How it is used
It tells the buyer the smallest rendering the creative must survive, so text and logos stay legible at that width.
Example
Where the field sits in a payload, with everything else left out:
{
"id": "req-1",
"imp": [
{
"banner": {
"format": [
{
"wmin": 320
}
]
}
}
]
}Common mistakes
- Confusing it with the removed
Banner.wmin, which set the low end of a size range for the whole banner rather than a minimum for a ratio.
Version history
Added in OpenRTB 2.5, 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 |
|---|---|---|---|
| 2.5 to 2.6-202606 | integer | No | No |