Best YouTube Thumbnail Size & Format in 2026

Published on January 25, 2026

Using the correct dimensions ensures your thumbnails look sharp on everything from a 4K TV to an iPhone. Here are the official specs you need to know.

The Golden Rule: 1280 x 720

The ideal resolution for a YouTube thumbnail is 1280 pixels wide by 720 pixels tall. This is an aspect ratio of 16:9, which matches the standard video player.

Key Specifications

• Minimum Width: 640 pixels.
• Max File Size: 2MB. Use our Compressor if your file is too big.
• Formats: JPG, GIF, BMP, or PNG.

Why Not 1920x1080?

While you can upload a 1080p image, YouTube will often compress it heavily to fit their delivery network. Starting with 1280x720 gives you more control over the final look and keeps file sizes manageable. However, if you can keep a 1080p image under 2MB, go for it!

Safe Zones

Remember that the bottom-right corner of your thumbnail will be covered by the timestamp (video duration). Avoid putting crucial text or faces in this area.