YouTube Thumbnail Size (2026): Dimensions, File Size and Format

By NexGama Studio · Updated October 27, 2026 · 2 min read

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A thumbnail is the first thing viewers see, and the wrong size leaves black bars, blurry text or a failed upload. YouTube’s recommendations have changed — many guides still say 1280 × 720, but YouTube now recommends 4K thumbnails. Here are the current numbers.

YouTube thumbnail size at a glance

Type	Recommended size	Minimum	Shape
Video	3840 × 2160 px	640 px wide	16:9
Shorts	2160 × 3840 px	640 px tall	9:16
Podcast	Square	—	1:1

File format and file size

Formats: JPG or PNG.
Uploading from desktop (YouTube Studio): up to 50 MB.
Uploading from the mobile app: up to 2 MB for video thumbnails (10 MB for podcasts).

A 3840 × 2160 PNG is often larger than 2 MB, so if you upload from your phone, save the thumbnail as JPG and compress it.

Is 1280 × 720 still OK?

Yes. 1280 × 720 is 16:9 and well above the 640-pixel minimum, so YouTube accepts it. It is just no longer the recommended size: on large TVs and high-resolution screens, a 3840 × 2160 thumbnail looks sharper. If your design software or source images are smaller, 1920 × 1080 is a good middle ground.

How to make a thumbnail the right size

Start with a screenshot or photo and open the Aspect Ratio Cropper. Choose 16:9 (or 9:16 for Shorts) and position the frame.
Open the Image Resizer and set 3840 × 2160 or 1920 × 1080 (or 1280 × 720 if your source is small — enlarging a small image won’t add detail).
Add your text and design in your editor of choice.
If the file is too big for mobile upload, run it through the Image Compressor as JPG with a target under 2 MB.

Custom thumbnails need a verified account

You can only upload your own thumbnail once your YouTube account is verified. Until then, YouTube picks a frame from the video. Custom thumbnails for Shorts can currently only be set in YouTube Studio on a computer.

Design tips that get more clicks

Design for small screens. Most views happen on phones, where a thumbnail is about the size of a thumb. Use 3–5 large words at most.
Keep the bottom-right corner clear. The video length is shown there and covers anything underneath.
Use high contrast. Bright subjects on darker backgrounds (or the reverse) stand out in a crowded feed.
Show a face or a clear object. Close-ups with a clear expression are easy to read at small sizes.
Study what works in your niche. The YouTube Thumbnail downloader saves any video’s thumbnail in every size so you can compare styles side by side.

Specifications come from YouTube Help; check it for the latest limits.

Tools used in this guide

Aspect Ratio CropperCrop to 1:1, 4:5, 9:16, 16:9 and more. Image ResizerSet exact width and height in pixels, with aspect lock. Image CompressorShrink JPG, PNG or WebP files, optionally to a target size in KB. YouTube ThumbnailGrab every thumbnail size for any YouTube link.