Official YouTube Thumbnail Specifications (2026 Reference)
Uploading a thumbnail with the wrong dimensions can cause ugly black letterboxing or severe mobile blurriness. Below are the official Google specifications for custom video thumbnails:
- Recommended Resolution: 1280 × 720 pixels
- Minimum Width: 640 pixels
- Aspect Ratio: 16:9 (standard widescreen)
- Maximum File Size: 2 MB
- Accepted Image Formats: JPG, PNG, GIF, BMP
Mobile Safe Zones
Remember that the video duration timestamp badge always overlays the bottom-right corner of your thumbnail on mobile devices. Never place crucial text, logos, or facial focal points in the lower right quadrant.