Stop guessing on pixel dimensions. Meta's official specs show which ad formats dominate Feed, Stories, Reels, and Marketplace, and why 1080x1080 beats them all for versatility.
Most small business owners running Facebook ads either guess on pixel dimensions or waste time hunting Meta's docs every campaign. The result: ads that crop awkwardly, waste screen space, or underperform because they weren't built for the placement.
Meta publishes official specs for every ad format. Here are the three dimensions that work hardest for most business owners, backed by Meta's 2026 Ads Guide.
This is the workhorse. One creative, four placements: Feed, Marketplace, carousel, and search results. If you're building a single ad set and want it to run everywhere Meta offers, 1:1 is your answer.
It doesn't maximize screen real estate on mobile (where most of your customers are), but the trade-off, one asset, maximum reach, makes it worth using as a baseline. Then, if budget allows, test the formats below for higher engagement.
Running ads on mobile Feed? 4:5 gives you significantly more screen real estate than 1:1. Your creative takes up more of the viewport, which means more attention and typically higher click-through rates.
This format doesn't work on Marketplace or search, so you can't run it everywhere. But if your campaign is Feed-focused (and most conversion-driven campaigns are), building a 4:5 asset and testing it against 1:1 almost always wins.
Stories and Reels demand vertical. 1080x1920 fills the entire mobile screen without black bars, keeping viewers locked on your creative. This is non-negotiable if you're running either format.
Many business owners skip Stories and Reels because they feel unfamiliar. But they're high-intent placements where your audience is already scrolling, and the right dimensions get you full attention.
We build creatives in the dimensions that match your placements, test multiple formats within your budget, and track which sizes drive conversions for your specific business. You don't need to memorize specs, we apply them so your ads show up right and perform.
Source: Meta's official Ads Guide, current as of July 2026.
How WebKing runs this
We handle ad sizing, spec compliance, and creative optimization so your ads fill the screen and perform. You focus on what to say; we make sure it shows up right.
1080x1080 pixels (1:1 square). It works across Feed, Marketplace, carousel, and search results placements, so you get maximum reach without redesigning assets for every format.
Use 4:5 (1080x1350) on mobile Feed, it gives you more screen real estate than 1:1 square and typically drives higher engagement since it takes up more of the screen your customers are looking at.
Use 1080x1920 pixels (9:16 vertical) for both. This fills the full mobile screen without awkward letterboxing, which keeps viewers' eyes on your creative instead of black bars.
Meta's official specs as of July 2026 confirm these dimensions remain the standard. Always check Meta's Ads Guide directly if you're launching a campaign, but these three formats are the foundation.
Sources
The Lab is original analysis by WebKing. We summarize and interpret developments from the sources above for industrial, commercial, and small business owners. Figures are reported as published by their sources.
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