Google Display

Google Display Large Mobile Banner Ad Size: 320×100 px

Aspect ratio 16:5 · 320×100 pixels · JPG, PNG, GIF, HTML5

320×100 wide banner, mobile-first. Frequently anchored to the bottom of the viewport on publisher sites.

Dimensions
320×100
Aspect
16:5
Max file
0.15 MB
Format
JPG
Resize to 320×100
Safe area
320 × 100 px

Why this size matters

Mobile equivalent of 728×90. Highest-inventory mobile display size after 300×250.

At a glance
Formats
JPG, PNG, GIF, HTML5
Max file size
0.15 MB
Best for
Mobile-first display — sticky bottom-of-screen banner.

Design tips that actually move the needle

  1. 01Ship alongside 300×250 as the mobile display default pair.
  2. 02Under 150 KB.
  3. 03Big enough for logo + short headline + CTA — don't over-cram.

People also ask

Is 320×50 or 320×100 better?+

320×100 has 2× the pixels and much better CTR. Use 320×50 as fallback for legacy inventory only.

What is 16:5 in pixels?+

For Google Display Large Mobile Banner, a 16:5 aspect ratio is 320×100 pixels. Any resolution with the same ratio works, but 320×100 px is the recommended native size and avoids upscaling.

Is 320×100 the right size for Google Display Large Mobile Banner?+

Yes — 320×100 px (16:5) is the recommended Google Display Large Mobile Banner ad size. Accepted formats: JPG, PNG, GIF, HTML5. Maximum file size: 0.15 MB.

Related sizes

Google Display
Medium Rectangle · 300×250
6:5 · Google's highest-inventory display size.

Free tools for this size

Aspect ratio reference

→ 16:5 aspect ratio: pixel sizes, mm and placements

Full platform reference

→ All Google Display ad specs

Stop resizing by hand. Xeli does it for you.

Xeli composes every asset to the correct native aspect and safe zone per placement — automatically, across every platform.

Get early access