336×280 Ad Size: Large Rectangle
The 336×280 large rectangle is a slightly bigger version of the 300×250. The extra space makes ads more visible inside articles, and it is a popular in-content size for AdSense publishers.
Specs
| Spec | Value |
|---|---|
| Name | Large Rectangle (also called large MPU) |
| Dimensions | 336 × 280 pixels |
| Aspect ratio | 6:5 |
| Devices | Mostly desktop |
| High-resolution version | 672 × 560 pixels (2×), scaled down |
| Typical file size | Keep images under 150 KB. Google Ads limits uploaded image ads to 150 KB. |
| Formats | JPG, PNG, GIF or HTML5 |
Where to place a 336×280 ad
- Inside the article, between paragraphs
- Directly below the article
Pros and cons
| Pros | Cons |
|---|---|
| ✓ More visible than 300×250 ✓ Accepts 300×250 ads too when set as a multi-size slot | ✗ At 336 pixels wide it is too wide for some small phones ✗ Fewer advertisers make creatives at exactly this size |
Tips for 336×280 ads
- Run it as a multi-size slot with 300×250 so every bid can compete.
- Hide it below a set screen width and show 300×250 instead.
- Reserve the slot’s height in your layout so the page doesn’t jump when the ad loads. See Core Web Vitals and ads.
Make a 336×280 banner for free →
Related ad sizes
Frequently asked questions
Is 336×280 better than 300×250?
It is more visible, but it gets fewer creatives. Most publishers use a slot that accepts both sizes and let the auction pick.
Does 336×280 work on mobile?
Only on wider phones. Many phones are 360 pixels or wider, but some are narrower, so a 300×250 fallback is safer.
Want to know what this slot could earn? Try the ad revenue calculator, or look up terms in the ad tech glossary.