FrameToCoverFree thumbnail tools

Thumbnail size checker

Check dimensions, format, aspect ratio and upload size for YouTube video thumbnails.

Choose a JPG, PNG or WebP to get started.

Your image stays in this browser.

YouTube video thumbnail guidance

For standard videos, YouTube recommends 16:9 and 3840 × 2160, with a minimum width of 640 px. Upload size limits vary by device.

Official YouTube guidance
  • Thumbnail resizer Crop an image to 16:9 and download it in the size you choose.
  • Thumbnail compressor Keep the original dimensions and export a JPG below your chosen file size.