YouTube Thumbnail Preview Tester
See your thumbnail at the sizes people actually see it. Mobile feed, sidebar, search.
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What is youtube thumbnail preview tester?
A thumbnail preview tester shows a YouTube thumbnail at the small sizes it is really viewed at, rather than the full-size version you designed it at. APImage's tester renders your image at mobile feed, sidebar suggestion and search result scale side by side in the browser, which is how you find out that the text is unreadable before the video goes live.
- 1Drop in your thumbnail, ideally 1280 by 720.
- 2Look at the smallest preview first. If the text is not readable there, it is not readable.
- 3Toggle light and dark surroundings, because contrast changes which one wins.
- 4Iterate until the smallest size still communicates one idea.
- Preview sizes
- Search, sidebar, mobile feed, end screen
- Recommended source
- 1280 x 720, 16:9, under 2MB
- Account
- Not required
Where this tool earns its place in a real workflow.
The free part is done
The AI tools do what a canvas cannot: generate the video, put your product in a scene, put a presenter in front of it.