AdNetworkTop Paying Ad Sizes for Publishers
Not all ad sizes have the same demand or earnings potential. Focus on the ad units that advertisers bid on the most to increase your fill rate and CPM. Learn which sizes work best for desktop and mobile.
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Ad Size Ranking
? How to Choose Best Ad Sizes
- Step 1: Review Size Rankings - Browse our ranked list of ad sizes by revenue potential. Top performers include 300x250, 336x280, and 300x600.
- Step 2: Check Device Compatibility - Note which sizes work best for your traffic split. Mobile-first sites should prioritize 300x250 and 320x100.
- Step 3: Consider Placement - Each ad size has optimal placement. 300x600 works best in sidebars, 728x90 below headers, 300x250 in-content.
- Step 4: Test in Your Layout - Implement 2-3 recommended sizes and monitor performance for 2+ weeks before making changes.
- Step 5: Monitor Key Metrics - Track: CTR, viewability rate, CPM, and overall RPM. High viewability (>70%) correlates with higher CPM.
- Step 6: Iterate and Optimize - Replace underperforming sizes. A/B test placements. Use auto-ads as backup fill while optimizing manual placements.
Frequently Asked Questions
Yes, the 300x250 Medium Rectangle remains the most versatile and demanded ad size. It works on both desktop and mobile, fits within content, and has the highest advertiser inventory. Nearly every ad campaign includes 300x250 creatives.
Top mobile ad sizes: 300x250 (in-content, highest demand), 320x50 (mobile leaderboard, low CPM but high fill), 320x100 (large mobile banner, good CPM), 336x280 (larger rectangle, higher CPM). Avoid 728x90 on mobile—it causes horizontal scroll.
Yes, if implemented correctly! Sticky sidebar ads (300x600) on desktop and sticky footer ads (320x100) on mobile increase viewability and impressions without hurting UX. Ensure content is still accessible. Google allows sticky ads with proper implementation.
Viewability measures if an ad was actually seen (50%+ pixels visible for 1+ second). Advertisers pay more for viewable impressions. Average viewability is 50-60%. Target 70%+ by placing ads above fold, using lazy loading, and choosing appropriate sizes for placement.
Quality over quantity! Google recommends ads don't exceed content. Typical setup: 3-5 ad units per page. More ads can decrease CPM per unit and hurt UX. Focus on high-viewability placements rather than cramming more ads. Test what works for your audience.
Lazy loading delays loading ads until they're about to enter viewport. Benefits: Faster page load (better SEO), higher viewability rates, better user experience. Most ad networks support lazy loading. Essential for pages with multiple ad slots.