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320 × 480Mobile Interstitial

A full-screen mobile placement shown between pages or app screens. Display & Video 360 and Adform list it; Google Ads does not take uploaded ads in this size. The portrait frame works like a small poster: an image, a headline and a clear button.

Example. Noordkaap, Split Field layout. The dashed frame is the safe zone: text, logo and button stay inside it. Shown at its real size.

Specs

Size320 × 480 pixels
Aspect ratio2:3 (0.67:1)
ShapePortrait
Runs onDisplay networks and ad servers
Safe zone14 px from every edge
Smallest text13 px for text and buttons, 19 px for headlines
Static fileUp to 150 KB
AnimationHTML5 or animated GIF, up to 15 seconds
Spec sourcesupport.google.com, checked Oct 16, 2026

Where it runs

The export packages that take this size, and what each one delivers for it.
PackageDelivers
Campaign Manager 360 · DV360Specs checkedJPG or PNG, up to 150 KBHTML5 ZIP with clickTag, ZIP up to 9,500 KB, backup image
AdformSpecs checkedJPG or PNG, up to 150 KBHTML5 ZIP with clickTag, up to 200 KB unpacked, backup image
XandrSpecs checkedJPG or PNG, up to 150 KBHTML5 ZIP with clickTag, backup image
IAB HTML5Specs checkedJPG or PNG, up to 150 KBHTML5 ZIP with clickTag, ZIP up to 150 KB, backup image

File size

The limit depends on where the banner runs. These are the limits for this size, and how Sizewright stays inside them.
Still imageUp to 150 KB
HTML5 package150 KB to 9,500 KB, depending on the package
  • Cut the number of images before their quality: one strong photo weighs less than three.
  • Sizewright subsets the fonts to the letters a banner uses and steps image quality down until each package fits its limit.
  • In animated GIFs Sizewright merges held frames and keeps the photo still when a limit needs it.

Design rules for 320 × 480

Portrait. Taller than it is wide, from 9:20 to 4:5. Read from top to bottom, like a poster.

What works

  • Use the height: the image in one half, the copy in the other, the button last in the reading order.
  • Give the image one tall subject rather than a crop of a wide scene.
  • Give the headline room for two or three lines rather than shrinking it to one.
  • Show the logo once, where the reading order begins or ends.
  • Expect the banner beside the content the visitor came for: one message and a clear button, readable in a second.

Common mistakes

  • A headline shrunk to one line to leave the image more room.
  • An empty middle, because the design was made for a square.
  • A wide photo cropped down to a sliver of its subject.
  • Copy that only makes sense once the landing page is open.

Made in this size

Real output for fictional brands, every banner passed by the same quality checks as yours.

Questions about the 320 × 480

Where is the 320 × 480 used?

A full-screen mobile placement shown between pages or app screens. Display & Video 360 and Adform list it; Google Ads does not take uploaded ads in this size. The portrait frame works like a small poster: an image, a headline and a clear button.

What size is a Mobile Interstitial banner?

A Mobile Interstitial is 320 × 480 pixels, an aspect ratio of 2:3. Sizewright composes it at exactly that size and also exports a version at twice the size for sharp screens on websites and in emails.

How large can a 320 × 480 file be?

It depends on where it runs. Campaign Manager 360 · DV360 (JPG or PNG, up to 150 KB; HTML5 ZIP with clickTag, ZIP up to 9,500 KB, backup image), Adform (JPG or PNG, up to 150 KB; HTML5 ZIP with clickTag, up to 200 KB unpacked, backup image), Xandr (JPG or PNG, up to 150 KB; HTML5 ZIP with clickTag, backup image), IAB HTML5 (JPG or PNG, up to 150 KB; HTML5 ZIP with clickTag, ZIP up to 150 KB, backup image).

Can a 320 × 480 banner be animated?

Yes. Sizewright animates it as HTML5 with a clickTag and as an animated GIF, kept to 15 seconds so it passes the stricter limits, and a still image always comes with it.

How do I design for the 320 × 480?

Taller than it is wide, from 9:20 to 4:5. Read from top to bottom, like a poster. Use the height: the image in one half, the copy in the other, the button last in the reading order. Give the image one tall subject rather than a crop of a wide scene. Give the headline room for two or three lines rather than shrinking it to one. Show the logo once, where the reading order begins or ends. Expect the banner beside the content the visitor came for: one message and a clear button, readable in a second.

Related sizes

All banner sizes

Create a 320 × 480 set from your brand

Paste your website address. Sizewright reads your brand and composes this size with every other format of the campaign.