YouTube Thumbnail Size (2026): Resize Images to 1280 x 720 or 3840 x 2160

Both sizes are 16:9, the shape YouTube displays, so neither is cropped or letterboxed. They differ only in how many pixels they carry.

1280 x 720 px was long the standard recommendation. YouTube's help page now describes thumbnails up to 3840 x 2160 px and a minimum width of 640 px, so 1280 x 720 is still comfortably above the floor. It makes a small file, which is the point: it uploads quickly and fits the mobile limit with room to spare.

3840 x 2160 px is the largest size YouTube lists. It keeps detail when a thumbnail is shown big, for example on a TV or an expanded view, and gives you headroom to crop. The price is file size. A busy 4K image can easily pass 2 MB.

A practical rule is to start from the larger size when you design, then export 1280 x 720 px if the upload is from a phone. Starting with a small picture and enlarging it to reach 4K only makes it blurry.

Shorts use a different shape. YouTube lists 2160 x 3840 px at 9:16 for them, which isn't one of the presets here. For that, enter the numbers in the Image Resizer.

YouTube sets different file size limits by device. On a computer a thumbnail can be up to 50 MB. In the mobile app the limit is 2 MB. JPG and PNG are the usual formats. YouTube also says your account must be verified before you can upload a custom thumbnail.

Because resizing changes the pixel size but not always the file size, this page turns on Keep under 2 MB for you. It lives in Advanced settings (optional) under Compression. If a file is above the limit, the quality is lowered until it fits. Your 1280 x 720 or 3840 x 2160 px dimensions don't change.

Photos compress well. A graphic with large flat areas and sharp text can be small as a PNG, and a busy photo is usually much smaller as JPG. Set Output format to JPG if the size is a problem. If the file still won't fit, Compress Image gives you more control over the target.

Switch the setting off if you only upload from a computer and want the highest quality.

A thumbnail is not always seen whole. YouTube places a video length badge over the bottom-right corner of the picture, so text or a face parked there is covered. Small phone screens also show thumbnails tiny, and long lines of text turn to mush. Aim for a few large words and keep them away from the edges.

Cropping matters too. When your image is a different shape, Crop to fill trims the edges, and the center is kept unless you move it. Open an image's settings and use the focal point picker to keep a face or a title in view. Use Fit with padding when nothing at the edges can be lost.

The Channel banner card works differently. YouTube asks for at least 2048 x 1152 px and recommends 2560 x 1440 px, especially for TV, with a file of 6 MB or less. On different screens the banner is cropped differently, so only a middle strip is always visible. At the minimum size that safe area is 1235 x 338 px, and logos and text should sit inside it.

Keep the banner free of borders, shadows and frames, which YouTube asks you to leave out. For a profile picture, the Crop Image tool can make a circle crop.