Google Display Ad — 300×250 Medium Rectangle Resizer

What matters

Google Display Ad — 300×250 Medium Rectangle dimensions at a glance

The 300×250 Medium Rectangle is the single most widely used display ad format. It fits naturally in content areas and sidebars, appearing on the majority of Display Network sites.

This size has the most available inventory on the Display Network. Missing this format means missing most potential ad placements.

File size over 150KB gets rejected. Low-quality or poorly designed ads get low click-through rates and wasted ad spend.

Best practices

Use the crop intentionally

• Include a clear CTA button — even a visual one increases click-through.
• Keep the message to one headline and one visual concept.
• Stay under 150KB — optimize images aggressively.