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YouTube Thumbnail Size: Resolution and Aspect Ratio Guide

Understand YouTube thumbnail dimensions, 16:9 ratios, file formats and the difference between uploaded and existing video thumbnails.

Short Answer

For a custom YouTube thumbnail, use a 16:9 image. YouTube currently recommends 3840 × 2160 pixels, with a minimum width of 640 pixels.

Thumbnail file requirements

  • Use JPG, GIF or PNG.
  • Keep the image at 16:9 where possible.
  • Mobile uploads can be limited to 2 MB; desktop limits can be higher, up to 50 MB.
  • Use a clear image that remains readable at small sizes.

Custom upload size versus existing video thumbnails

The upload recommendation describes a thumbnail you create for your own video. Existing YouTube videos may expose several generated image variants, including a maxresdefault image when available. These are different use cases.

Common YouTube thumbnail sizes and variants

16:9 custom thumbnail: 3840 × 2160 recommended
Standard preview: 480 × 360 (4:3 in some legacy contexts)
High-resolution variant: maxresdefault.jpg (availability varies)

Thumbnail size checklist

  • Use a 16:9 canvas.
  • Export a supported JPG, GIF or PNG.
  • Keep text and faces inside the safe central area.
  • Check the file size before uploading.
  • Preview the image on both desktop and mobile.

How to inspect an existing video thumbnail

Paste a public YouTube URL into Video Info & Thumbnail to preview the available image and copy its thumbnail URL.

Related Tool

Use the matching tool to complete this task.

Open Video Info & Thumbnail →

Frequently Asked Questions

What is the best YouTube thumbnail aspect ratio?

16:9 is the standard aspect ratio for YouTube thumbnails.

Is 1280 × 720 still the only valid size?

No. It is a common 16:9 size, but YouTube currently recommends 3840 × 2160 for custom thumbnails.

Can every video provide a maxresdefault thumbnail?

No. Availability depends on the video and YouTube image variants.

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