320 × 100Large Mobile Banner
Twice the height of the mobile leaderboard, in the same positions on mobile. The extra height gives the headline a second line, or room for a product image beside it.
Specs
| Size | 320 × 100 pixels |
|---|---|
| Aspect ratio | 16:5 (3.2:1) |
| Shape | Landscape |
| Runs on | Display networks and ad servers |
| Safe zone | 6 px from every edge |
| Smallest text | 10 px for text and buttons, 14 px for headlines |
| Static file | Up to 150 KB |
| Animation | HTML5 or animated GIF, up to 15 seconds |
| Spec source | support.google.com, checked Oct 16, 2026 |
Where it runs
| Package | Delivers |
|---|---|
| Google Ads · HTML5Specs checked | JPG or PNG, up to 150 KBHTML5 ZIP with clickTag, ZIP up to 600 KB |
| Google Ads · imagesSpecs checked | JPG or PNG, up to 150 KBAnimated GIF, up to 150 KB |
| Campaign Manager 360 · DV360Specs checked | JPG or PNG, up to 150 KBHTML5 ZIP with clickTag, ZIP up to 9,500 KB, backup image |
| AdformSpecs checked | JPG or PNG, up to 150 KBHTML5 ZIP with clickTag, up to 200 KB unpacked, backup image |
| XandrSpecs checked | JPG or PNG, up to 150 KBHTML5 ZIP with clickTag, backup image |
| IAB HTML5Specs checked | JPG or PNG, up to 150 KBHTML5 ZIP with clickTag, ZIP up to 150 KB, backup image |
File size
| Still image | Up to 150 KB |
|---|---|
| HTML5 package | 150 KB to 9,500 KB, depending on the package |
| Animated GIF | Up to 150 KB |
- 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 × 100
What works
- Split the frame: image on one side, headline and button on the other, so neither covers the other.
- Put the subject of the image on the side away from the copy, so faces and products are never cut by text.
- A headline and a short subline fit; keep the button in the copy column, in reading order.
- Keep the logo small, in a corner of the copy column: the image already fills half the frame.
- Expect the banner beside the content the visitor came for: one message and a clear button, readable in a second.
Common mistakes
- Centering everything, which leaves the corners empty and the copy floating.
- Text across the busiest part of the image.
- A logo as large as the headline.
- Copy that only makes sense once the landing page is open.
Made in this size
Velo Atelier, Full Bleed · See the whole set
Questions about the 320 × 100
Where is the 320 × 100 used?
Twice the height of the mobile leaderboard, in the same positions on mobile. The extra height gives the headline a second line, or room for a product image beside it.
What size is a Large Mobile Banner banner?
A Large Mobile Banner is 320 × 100 pixels, an aspect ratio of 16:5. 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 × 100 file be?
It depends on where it runs. Google Ads · HTML5 (JPG or PNG, up to 150 KB; HTML5 ZIP with clickTag, ZIP up to 600 KB), Google Ads · images (JPG or PNG, up to 150 KB; Animated GIF, up to 150 KB), 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 × 100 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 × 100?
Between 1.25 and 4 times as wide as it is tall. Room for an image beside the copy, like a magazine spread. Split the frame: image on one side, headline and button on the other, so neither covers the other. Put the subject of the image on the side away from the copy, so faces and products are never cut by text. A headline and a short subline fit; keep the button in the copy column, in reading order. Keep the logo small, in a corner of the copy column: the image already fills half the frame. Expect the banner beside the content the visitor came for: one message and a clear button, readable in a second.
Create a 320 × 100 set from your brand
Paste your website address. Sizewright reads your brand and composes this size with every other format of the campaign.