YouTube Thumbnail Size 3840x2160 — 2026 Guide
Everything you need for YouTube Thumbnail, updated for 2026.
Last updated: April 2026
Size Reference
| Usage | Dimensions | Aspect Ratio |
|---|---|---|
| Thumbnail | 3840 x 2160 | 16:9 |
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Resize for ThumbnailAbout YouTube Thumbnail
YouTube currently recommends custom thumbnails at 3840x2160 pixels, with a 16:9 aspect ratio and a minimum width of 640 pixels. Mobile thumbnail uploads are limited to 2 MB, while desktop uploads can be larger. They appear everywhere YouTube surfaces a video — search, suggested videos, and embedded players — so legibility at small sizes is critical.
Tips
- 1Design at 3840x2160 when you have a high-resolution source; keep the same 16:9 layout if you export an HD fallback.
- 2If uploading from mobile, keep the file under 2 MB; desktop uploads allow larger thumbnail files.
- 3Place the duration overlay (bottom-right) safely — avoid putting key text there.
- 4Test your thumbnail at 320 px wide (the size in YouTube's sidebar) before publishing.
Frequently Asked Questions
What is the official YouTube thumbnail size?
YouTube currently recommends 3840x2160 pixels with a 16:9 aspect ratio and a minimum width of 640 pixels.
Why is my YouTube thumbnail rejected for being too large?
The upload limit depends on where you upload. Mobile thumbnail uploads are limited to 2 MB, while desktop uploads support larger files. Re-export as JPEG or WebP if you need a smaller file.
Should YouTube thumbnails be JPEG or PNG?
JPEG is the most reliable choice for photographic thumbnails. PNG is acceptable for graphics with sharp text, but file size can climb quickly at 3840x2160.