YouTube Thumbnail Size 2026: Dimensions, File Size and Format

The recommended YouTube thumbnail size is 3840 × 2160 pixels for videos (16:9) and 2160 × 3840 for Shorts (9:16), according to YouTube Help. The minimum is 640 pixels wide for videos (640 pixels tall for Shorts). Upload a JPG or PNG under 50 MB from a computer or 2 MB from a phone. Older guides still say 1280 × 720 and 2 MB. Those numbers are out of date: YouTube now asks for the largest image you can make, because the thumbnail doubles as the preview image in embedded players (YouTube Help).

Key takeaways

• Recommended: 3840 × 2160 for videos, 2160 × 3840 for Shorts. Minimum width 640 px (videos) or minimum height 640 px (Shorts) (YouTube Help).
• File limits depend on where you upload: 50 MB on a computer, 2 MB for video thumbnails on mobile (YouTube Help).
• You need a verified YouTube account to upload a custom thumbnail. Custom thumbnails for Shorts can only be added in YouTube Studio on a computer (YouTube Help).
• Thumbnails must follow YouTube's Community Guidelines. A thumbnail that breaks them can be rejected and earn a strike, and repeat offenses can cost you custom thumbnails for 30 days (YouTube Help).

YouTube thumbnail size and specs at a glance

All figures are from YouTube's custom thumbnail help page. If you design at 3840 × 2160, you can export a smaller copy, for example 1920 × 1080 or 1280 × 720, when you need to stay under the 2 MB mobile limit. All three are the same 16:9 shape, so nothing gets cropped.

Why the old 1280 × 720 number keeps showing up

For years, YouTube's recommendation was 1280 × 720 pixels and under 2 MB, and most guides were written then. YouTube's help page now recommends 3840 × 2160 and lets you upload up to 50 MB from a computer, while the 2 MB cap still applies when you upload from a phone. A 1280 × 720 thumbnail still meets the minimum, so it isn't wrong, just not what YouTube currently recommends.

Shorts and vertical videos are different

• Shorts: use a 9:16 image, ideally 2160 × 3840. You can only add one in YouTube Studio on a computer, either while uploading or afterwards (YouTube Help).
• Vertical videos with a 16:9 thumbnail: YouTube replaces the thumbnail with an auto-generated 4:5 one on the home, explore and subscription pages. Your own thumbnail still shows in the watch feed, watch history and on non-mobile platforms (YouTube Help).

How to upload a custom thumbnail

On a computer (YouTube Studio)

1. Sign in to YouTube Studio and select Content in the left menu.
2. Open the video you want to edit.
3. Under Thumbnail, click Upload file (or Get suggestions for auto-generated options).
4. Click Save.

For a Short, choose Shorts at the top of the Content page first, then follow the same steps.

On iPhone or Android

1. Open the YouTube Studio app and tap Content in the bottom menu (or, in the YouTube app, tap your profile picture → Your videos).
2. Select the video, tap Edit, then Edit thumbnail.
3. Tap Custom thumbnail, choose an image, tap Select, then Save.

Changes can take a while to show up on YouTube (YouTube Help). If the upload option is missing, your account probably isn't verified yet.

Design tips that hold up at small sizes

Most people see your thumbnail as a small image on a phone, so a 3840 × 2160 design has to read when it's shrunk down. Before you upload:

• Check it small. Zoom out until the image is about the size of your thumb. If you can't read the text or tell what's happening, simplify.
• Use few words. A short phrase in large, bold type reads better than a sentence.
• Keep the bottom-right corner clear. YouTube shows the video's length there, so don't put text or faces underneath it.
• Match the video. Show what the video actually delivers. Viewers who feel misled click away.

Use other thumbnails for research, not reuse

Looking at what works in your niche is a good way to plan your own design. The ClipSaves YouTube Thumbnail Downloader shows any public video's thumbnail full size: paste the link and pick a size from 1280 × 720 down to 320 × 180. Our guide to downloading YouTube thumbnails in HD explains each size.

A thumbnail belongs to the channel that made it, so don't upload someone else's thumbnail as your own. Use it to study layout, color and wording, then make your own. Making Shorts too? See how to download YouTube Shorts and the free tools for content creators roundup.