CREATOR TOOLS
Check how your thumbnail reads on a small screen
A thumbnail that looks clear on a large monitor may be hard to read on a phone. Preview your image at two sizes and test a sample headline overlay before you publish.
How it works
Select a PNG, JPEG, WebP or GIF image under 12 MB. The tool shows its dimensions, a 16:9 desktop preview and a compact mobile preview. Image analysis stays in your browser.
Frequently asked questions
Does this predict the click-through rate?
No. It checks visual presentation only and does not predict views or replace YouTube Studio's own thumbnail experiments.
Is my image uploaded?
No. The image is shown locally in your current browser page.
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