Free tool
Ad Size Checker
Drop your creative: the tool tells you, placement by placement, where it shows in full, where it gets cropped, and where it will not run. Meta and Google, images and videos.
Each ad platform publishes its formats. Meta accepts feed creatives from 4:5 to 1.91:1, at least 600 px wide, and shows 9:16 full screen in Stories and Reels. Google Display asks for 1.91:1, 1:1 or 9:16, with a minimum size per format. This tool measures your file and checks it against those rules.
- Dimensions
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- Aspect ratio
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- File size
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- Duration
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Drop a creative: the tool tells you, placement by placement, whether it runs as is.
Based on the specs published by Meta and Google, read on 28 September 2026.
How the tool reads your creative
Aspect ratio = width ÷ height 1,080 ÷ 1,350 = 0.8 → 4:5
A creative is built for a placement, not for a platform. The same file behaves like a painting hung in three frames: whole in the feed, cropped from the center in a Story, off-format in a Display banner. The tool works out the aspect ratio, width divided by height, matches it to the closest standard format, then applies the rules of each placement.
The two platforms do not react the same way. Meta crops an off-format image from the center without telling you, so the top and bottom disappear. Google only accepts three ratios in a responsive ad, and an off-format image has to be cropped before upload. A creative built for Meta cannot be reused as is on Google.
Reading Meta’s documentation, I found a trap: in catalog ads, a product image too small for Instagram, under 600 px per side, triggers no error when you create the ad. It simply never runs on Instagram. No screen flags it, a measure of the file catches it in one second.
Three rules to keep in mind
- Reels and Stories: a 9:16 creative fills the whole screen. Meta asks you to keep the bottom 35 % free of text, logos and key elements, because the Reels interface sits there.
- Demand Gen: a video under 10 seconds does not run in-stream on YouTube, and 5 seconds is the minimum to be accepted.
- Display: Google asks you not to put your logo on the image, as it would repeat in some layouts where the logo already shows.
Your creatives run everywhere, but your campaigns plateau?
The format gets the creative through, the message gets the click. Let’s look at your testing structure and your creatives.
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Théo MaupiléFreelance Paid Media
Google PartnerSuperMalter
