300×600 Ad Size: Half Page
The 300×600 half page ad is a tall sidebar format that is very popular with advertisers. Because it is big and often sticky, it can earn some of the highest CPMs among standard sizes.
Specs
| Spec | Value |
|---|---|
| Name | Half Page (also called large skyscraper) |
| Dimensions | 300 × 600 pixels |
| Aspect ratio | 1:2 |
| Devices | Desktop |
| High-resolution version | 600 × 1200 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 300×600 ad
- Sidebar, often as a sticky ad
- Next to long articles
Pros and cons
| Pros | Cons |
|---|---|
| ✓ High visibility and strong CPMs ✓ Can accept 300×250 and 160×600 ads in the same slot | ✗ Needs a sidebar at least 300 pixels wide ✗ Not for mobile |
Tips for 300×600 ads
- Make it sticky in the sidebar so it stays in view while users read.
- Allow 300×250 in the same slot to keep the fill rate high.
- 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 300×600 banner for free →
Related ad sizes
- 160×600 Wide Skyscraper
- 300×1050 Portrait
- 300×250 Medium Rectangle
- All banner ad sizes with live previews
Frequently asked questions
Why does 300×600 earn so much?
It is large, stays in view in a sticky sidebar, and many brand advertisers buy it.
Can I use 300×600 on mobile?
It is too tall for most mobile layouts. Use 300×250 or 320×100 instead.
Want to know what this slot could earn? Try the ad revenue calculator, or look up terms in the ad tech glossary.