YouTube Thumbnail Preview Tester
Upload a thumbnail and fill in your title to see exactly how they'll look in three places viewers actually see them: search results, the suggested-videos sidebar, and the mobile home feed.
Nothing is uploaded anywhere — the image is rendered locally in your browser using JavaScript.
Desktop search result
Suggested videos sidebar
Mobile home feed
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How it works
- 1Upload your thumbnail image (any size — it'll be cropped to YouTube's 16:9 the same way YouTube does).
- 2Type your title and, optionally, your channel name and video length.
- 3Compare the three live mockups below and adjust until it reads well small.
Frequently asked questions
Why does my thumbnail look small on mobile?+
Most watch time on YouTube happens on mobile, where thumbnails render tiny. Titles and thumbnails that only work at full size often fail on a phone — that's exactly what this tool is for.
What size should my thumbnail be?+
YouTube recommends 1280×720px (16:9 ratio), under 2MB, as JPG, GIF, or PNG.