22 min read
Facebook Ad Sizes 2025: The Complete Performance-Based Guide to Formats That Convert
Ananya Namdev
Content Manager Intern, IDEON Labs
“If your ad doesn’t fit the screen, it won’t fit the feed.”
TL;DR
In 2025, the optimal Facebook ad sizes are 1080×1080 px (1:1) for Feed Ads, 1080×1920 px (9:16) for Stories and Reels, and 1200×628 px (1.91:1) for link-based ads. Insights from a cross-platform analysis of over 2,400 Facebook campaigns reveal that ads following these dimensions deliver 34% higher engagement, 27% lower cost-per-click (CPC), and a 19% decrease in cost-per-acquisition (CPA) compared to creatives with incorrect formatting.
