Short answer: the ad sizes that reliably earn the most are the large rectangle (336x280), the medium rectangle (300x250), the large mobile banner (320x100), and the leaderboard (728x90). Placement matters as much as size, ads inside content and above the fold earn far more than ones buried in the footer. Here is what works and why. The top-earning ad sizes Size Name Best for 336x280 Large Rectangle In-content, highest earner 300x250 Medium Rectangle In-content and sidebar, huge demand 320x100 Large Mobile Banner Mobile, where most traffic is 728x90 Leaderboard Desktop header/between sections 300x600 Half Page Sticky sidebar, high viewability The rectangles (300x250 and 336x280) win because advertisers bid heavily on them and they fit naturally inside articles. Placement beats size Where an ad sits affects earnings more than its dimensions: Within the content, after the first or second paragraph, tends to earn most because readers actually see it. Above the fold ...
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