Banner sizes

Each campaign runs one banner at one size. You pick the size when you build the campaign, then upload an image at exactly those dimensions. Your ad shows only in ad slots that were set up for the same size, so the size you choose decides where your ad can appear.

The sizes you can run

Pick from the standard display sizes below. The size picker lists them roughly in order of how widely each one is used across the web, so the most common choices are near the top.

Rectangles — the workhorses, they sit inside articles and content:

• 300×250 — Medium Rectangle
• 336×280 — Large Rectangle

Wide banners — top-of-page and header strips on desktop:

• 728×90 — Leaderboard
• 970×90 — Super Leaderboard
• 970×250 — Billboard

Tall units — sidebars:

• 300×600 — Half Page
• 160×600 — Wide Skyscraper

Mobile banners — phone-width slots:

• 320×50 — Mobile Leaderboard
• 320×100 — Large Mobile Banner
• 300×100 — 3:1 Mobile Banner
• 300×50 — Compact Mobile Banner

Choosing one

More sites carry the common sizes, so a widely-used size generally has more places your ad can run. If you're not sure where to start, the Medium Rectangle (300×250) and the Leaderboard (728×90) are the two most universal — a rectangle for in-content slots, a leaderboard for the top of a page — and 320×50 covers mobile. You can run more than one campaign, one per size, to reach both desktop and phone slots.

The file rules

• Format: PNG, JPEG, GIF, or WebP. (Animated GIF or WebP is fine.)
• File size: 512 KB or smaller.
• Dimensions must match exactly. If you pick 336×280, the image has to be 336×280 pixels. We check the actual image, not the filename — a mismatch is rejected with a message telling you the size we found versus the size you picked, so nothing serves at the wrong dimensions.

Before it goes live

A banner is reviewed before it can serve, and a campaign can't be activated while its ad is pending or rejected. Once it's approved and your campaign is active, it competes for matching slots; when it wins and the ad actually renders, that's a served impression — see what counts as a served impression.