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Free tool

YouTube thumbnail tester.

Drop in a thumbnail and see it the way viewers will: in desktop search, in the suggested sidebar, and on a phone. Plus a quick check against YouTube's spec. Runs in your browser, nothing is uploaded.

Drop your thumbnail here, or click to browse JPG, PNG, WebP. YouTube recommends 1280 x 720.

Moonb makes the video behind it.

A good thumbnail earns the click, the video keeps it. Video, design and motion from a dedicated team.

See how it works

About this tool

Preview a thumbnail exactly where it will live before you upload it: desktop search results, the suggested sidebar, and mobile. The tester also checks the specs, 1280 by 720 pixels, 16:9, under 2MB, and shows how your image survives the small sizes where most clicks actually happen.

Related reading: How to optimize thumbnails

How to use it

  1. Drop your thumbnail image onto the drop zone.
  2. Check the spec results: dimensions, aspect ratio, and file size.
  3. Review the previews at real YouTube display sizes and squint test the small ones.

Frequently asked questions

1280 by 720 pixels, 16:9, under 2MB, as JPG, PNG, or WebP. That is the spec YouTube recommends.

Most views come from small placements. Thin text and busy detail vanish at sidebar size, use bold shapes, big faces, and 3 to 4 words max.

No. The previews render locally in your browser.