Supported Banner Sizes

Every IAB banner size supported by Advlume — mobile vs. desktop breakpoints, sticky footer sizes, and how to configure sizes per ad unit in the dashboard.

Advlume supports all standard IAB banner sizes. The sizes you assign to each ad unit determine which creative dimensions can be requested from demand partners — more sizes per unit means more potential buyers and better fill rates.

Supported sizes by viewport

Mobile (viewport width ≤ 767px)

Size	Name	Notes
300×250	Medium Rectangle	Universal size. Highest demand on mobile and desktop.
320×50	Mobile Leaderboard	Top or bottom strip on mobile. High fill rate.
320×100	Large Mobile Banner	2× height of mobile leaderboard. Better CPM than 320×50.
300×50	Mobile Banner	Narrower alternative to 320×50.

Desktop (viewport width ≥ 768px)

Size	Name	Notes
728×90	Leaderboard	Standard top-of-page banner. Very high demand.
300×250	Medium Rectangle	Works on both mobile and desktop. Highest overall demand.
970×250	Billboard	High-impact format. Requires sufficient page width.
970×90	Super Leaderboard	Wider leaderboard for full-width layouts.
468×60	Full Banner	Classic format. Less common in modern layouts but still supported.
336×280	Large Rectangle	Slightly larger than 300×250. Good for content placements.
320×50	Mobile Leaderboard	Included at desktop breakpoint for hybrid responsive layouts.
320×100	Large Mobile Banner	Included at desktop breakpoint for hybrid responsive layouts.
300×50	Mobile Banner	Narrow format, rarely used at desktop breakpoints.

Sticky footer sizes

For data-advlume-format="footer" slots, the wrapper uses a wider default size set to accommodate the fixed bottom bar across all viewports:

970×250, 970×90, 728×90, 468×60 (desktop)
320×100, 320×50, 300×250, 300×100, 300×50 (mobile)

The viewport filter automatically removes sizes wider than the current screen, so a mobile visitor will never be served a 970×250 creative.

How sizes are assigned

Sizes are configured per ad unit in your Advlume dashboard (Website → [site name] → Ad Units → [unit name] → Edit). The sizes you configure there are published to the CDN config and applied by the wrapper on every page load. Publishers do not need to add data-sizes to their HTML — the API is the source of truth.

Best practices

Enable as many sizes as your layout can accommodate. More sizes = more eligible buyers = higher fill rate and CPMs.
Always include 300×250. It has the deepest demand pool of any banner size and will serve as the fallback for most placements.
For desktop leaderboards, include both 728×90 and 970×90 if your layout is wide enough — the wider size typically commands a higher CPM.
The wrapper filters out sizes larger than the slot's available width at render time, so it is safe to include large sizes; they will only serve when the layout can accommodate them.