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What is the YouTube thumbnail file size limit?
The YouTube thumbnail file size limit is 2 MB on mobile; 50 MB on desktop. Verified 2026-10-16 from the official YouTube page.
| Spec | Value | Source | Last verified |
|---|---|---|---|
| Thumbnail file size limit | 2 MB on mobile; 50 MB on desktop Mobile podcast thumbnails: 10 MB. | official page | Verified |
| Custom video thumbnail size | 3840 x 2160 px recommended, 16:9; minimum width 640 px | official page | Verified |
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Quoted from YouTube's official page and dated; we don't use third-party guides. How we verify.