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Scalable Preview
Use the slider under the image to adjust size.
Quick size previews
YouTube makes adjustments so these sizes are approximate.
Attention test
Does yours stand out in the feed?
Upload a batch of competitor thumbnails from your niche. Yours gets dropped in at a random spot so you can see if yours stands out or matches niche themes. Uploaded 0 so far.
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or click to browse · add as many as you like
Specs check
Ratio and size check
A quick check on the three things that trip creators up — resolution, aspect ratio and file size.
Checking your thumbnail…
Optimization test
Is your thumbnail ready to publish?
Answer a few quick questions about your thumbnail. We’ll flag anything worth fixing before you hit publish and then hand you a copy-paste report for your designer or AI tool.
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