Midscroll Mobile HTML 5



Recommended default creative dimensions

Width: 1080px
Height: 1920px

Ad Viewport

Width: 100% of browser width
Height: 80% or 100% of browser height


Content-free safezones should be added to the top and bottom of your creative. The size of the safezones required will depend on the setup of midscroll placement:

Midscroll Height
(Publisher Dependant)
Recommended Safe Zones
(Top & Bottom)


Safe zones should be free of any important content (text, logos, CTA’s etc), as they may be overlapped by publisher page elements.

Note: Some publisher sites have a nav bar that covers the top of the creative - please check the publisher guidelines and make additional allowances with your safe zones if required.

Format description and guidance

Midscroll is a high impact responsive format that appears mid-way down a publisher page (in-between page content). It must be built so that all the imagery and content scales to fit the browser window. It is typically served to appear at 80% of the available browser window height, but can also be 50% or 100% (dependent on publisher). For more information about building responsive creative, check out our Guide to Responsive HTML and building responsive creative guide

All creative assets (images, videos, scripts etc) used by your banner must be included within the creative Zip-file. Linking to assets hosted on external severs is not permitted, and may result in your ad being blocked by some vendors. The only exception to this rule is for webfonts hosted by fonts libraries for licensing purposes, such as Adobe Typekit, Google Fonts, MyFonts etc.

Creative Lab Webinars

Join our resident Head of Creative, John Feltham, as he walks through the process of building hTML5 creatives.

Getting hands on with responsive HTML5 


Max total file weight

1 MB (recommended)
For best performance, all assets should be compressed and optimized to the lowest possible file weight.


Maximum of 5 loops.
Maximum animation time 30 seconds (may vary by publisher).

Asset type

Responsive HTML5 (either Adnami hosted by sharing a zip-file or served via 3rd party tags).
HTML must be minified and optimized for polite load.

Click tags and tracking

For Adnami hosted creatives, see our clicktags and tracking guide. 
To enable video tracking metrics, see our API for measuring VTR guide.
For creatives hosted using 3rd party tags, use the appropriate click methods and trackers for that provider examples.


Any audio must be user-initiated.