Ad Specifications

Basis DSP accepts almost any ad format that is accepted by our exchange partners. Precise specifications vary from exchange to exchange. To ensure your ads are accepted on all inventory sources, please follow the IAB Display & Mobile Advertising Creative Format Guidelines (PDF).

The following specifications are particularly important for the widest acceptance of ads.

Display (Banner) Ads

Image dimensions (Desktop):  

728x90*, 300x250*, 160x600* (standard sizes)
120x600, 300x600

Image dimensions (Mobile):

320x50*, 300x50* (smartphone banner, most common)
320x480*, 480x320 (smartphone interstitial)
300x250* (mobile interstitial, tablet in-app, mobile web)
728x90* (tablet only) 
1024x768*, 768x1024 (tablet interstitial)

File size (kb):

200kb max. bulk upload in ZIP files up to 10mb

File type:


Animation length:

No more than 15 seconds and/or 3 loops 

Max version (Flash):

10 suggested for maximum compatibility

Max frame rate (Flash):

24 fps

clickTag format (Flash and HTML5):

clickTag or clickTAG


Creative must clearly separated from the site content, either by a clear border or a non-white background color.

*Recommended Ad Sizes

Other Supported Ad Sizes

(availability may vary, please consult the Inventory tab)

120x20, 168x28, 180x150, 216x36, 234x60, 250x360, 300x50, 300x170, 300x340, 300x1050, 320x240, 320x320, 336x280, 386x300, 400x300, 468x60, 480x360, 480x800, 631x385, 640x480, 700x450, 750x200, 970x90, 970x250, 980x120, 980x150, 990x200

Video Ads

Video dimensions:

Minimum height of 144 px

Up to 2048x1080. Avoid uploading UHD (4K) video or higher resolution. See Transcoding Videos Using Handbrake if your videos are larger.

Aspect ratio:

16:9 or 4:3


Up to 60 seconds

Max file upload size:

100 MB

For Basis DSP-hosted ads, Basis DSP will automatically transcode the video into all necessary formats. If you're uploading video files, you only need to upload a single size for each video. Upload a high-quality version, and the system automatically creates copies for each size used by your ads. See Uploading Videos for details.


Third-party VAST 2.0 or 3.0 is also accepted. Only InLine Linear ads are accepted; Non-linear and wrappers are not accepted. VAST from a third party server must contain at least one MP4 media file, but it is strongly advised that the following be in the VAST:

  • MP4 high bitrate
  • MP4 low bitrate
  • FLV high bitrate
  • FLV low bitrate
  • (Optionally, but preferably) WebM high bitrate
  • (Optionally, but preferably) WebM low bitrate

"Low bitrate" is around 400-600kbps, "High bitrate" is around 1000-1200 kbps.

Multiple bitrates are recommended for broadest acceptance, with at least one version with a bitrate less than 400kbps for mobile compatibility.

Ideally, the low bitrate versions are encoded at a lower resolution (i.e. 640x360 for 16:9 video, 640x480 for 4:3 video) if the high bitrate version is at a higher resolution. This is because the quality of a high-resolution video at low bitrate will be poor, and some devices, especially mobile, may have difficulty playing very high resolution (i.e. 1080p) video.

For more information, see Chapter 2 of the IAB Digital Video Format Guidelines.

Native Ads 


Always used?


Brand Name

Exactly as you want it to appear including spelling, spacing, and capitalization.

Brand Logo

Minimum 300x300px, transparent PNG.

Main Image

JPG, minimum 1000x750px. Aspect ratio of 1.33:1 or 1.5:1 recommended.

Headline Text

Maximum 75 characters, but 30 characters is recommended; longer may be truncated on some inventory.

Body Text

Maximum 140 characters. May be truncated.

Click URL

The destination when the ad is clicked on.

Note: These specs are a lowest common denominator usable on Basis DSP’s current supply sources. Native ads vary greatly by publisher and exchange; for best results, produce ads to the specs for each of Sharethrough and TripleLift

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