YouTube Thumbnail Size 2026: 3840 x 2160 and 16:9 Specs

The recommended YouTube thumbnail size is 3840 x 2160 pixels with a 16:9 aspect ratio, and the minimum width is 640 pixels. Upload a JPG or PNG under 50MB from a computer, or under 2MB from the YouTube app on your phone. Shorts use the same size turned on its side: 2160 x 3840 at 9:16.

Those numbers come from YouTube’s custom thumbnail help page, checked in November 2026. Here is the full set:

Spec	Videos	Shorts	Podcast playlists
Recommended size	3840 x 2160 px	2160 x 3840 px	Not specified
Aspect ratio	16:9	9:16	1:1
Minimum size	640 px wide	640 px tall	Not specified
Formats	JPG or PNG	JPG or PNG	JPG or PNG
Max file size, computer	50MB	50MB	50MB
Max file size, phone	2MB	Computer only	10MB

Is 1280 x 720 Still the Right Size?

For years, YouTube’s help page recommended 1280 x 720 pixels with a 2MB file limit. Most guides still quote that number, and so does Google’s AI answer for “youtube thumbnail size.” In 2026, YouTube changed its recommendation to 3840 x 2160 (4K) and raised the limit for computer uploads to 50MB.

A 1280 x 720 or 1920 x 1080 thumbnail still uploads fine. Both are 16:9 and both clear the 640-pixel minimum. YouTube asks for an image “as large as possible” because the thumbnail doubles as the preview image in the embedded player, so a bigger source stays sharper when it is shown large.

One catch if you upload from your phone: the YouTube app caps video thumbnails at 2MB. A 3840 x 2160 PNG will often be over that, so export a JPG or upload from YouTube Studio on a computer.

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This video was recorded in 2025, before YouTube changed its recommendation. Where it differs, go by the table above.

YouTube Thumbnail Aspect Ratio

Use 16:9 for regular videos. It matches the player, so the image fills the frame without black bars or cropping. Any 16:9 size works: 3840 x 2160, 1920 x 1080, and 1280 x 720 are all the same shape.

Shorts take a vertical 9:16 image. Podcast playlists are the exception that trips people up: YouTube asks for a 1:1 square there instead of 16:9.

If a vertical video has a 16:9 custom thumbnail, YouTube swaps in an auto-generated 4:5 thumbnail on the Home, Explore, and Subscriptions pages. Your own image still shows in the watch feed, in watch history, and on non-mobile platforms. If you want your design everywhere, give vertical videos a 9:16 thumbnail.

Designing at 3840 x 2160

A bigger canvas doesn’t change what makes a thumbnail readable. A few things to check before you upload:

• Shrink the finished image to phone size and look at it again. Text that is easy to read at 3840 pixels wide can turn into a smudge in a search result.
• Keep important text and faces out of the bottom-right corner, where YouTube usually puts the video length.
• For Shorts, keep the subject near the center. Buttons and captions can cover the edges of a vertical frame.
• Make the image match what the video delivers. When you A/B test thumbnails, YouTube picks the winner by watch time, so a thumbnail that gets clicks but disappoints viewers can lose.

File Formats and Size Limits

YouTube lists JPG and PNG. Earlier versions of the help page also named GIF, but the current one doesn’t. Keep your layered file (Photoshop, Figma, or Canva) as the working copy and export a flat JPG or PNG to upload.

The size limit depends on where you upload. From a computer, video, Shorts, and podcast thumbnails can all be up to 50MB. From a phone, the cap is 2MB for video thumbnails and 10MB for podcast thumbnails. Custom Shorts thumbnails can only be added in YouTube Studio on a computer.

How to Add a Custom Thumbnail

Verify Your Account First

Custom thumbnails need a verified channel. YouTube sends a code by text or voice call, and one phone number can be linked to no more than 2 channels per year (YouTube account verification).

To check your status, sign in to YouTube Studio on a computer and click Settings, then Channel.

Open the Feature eligibility tab and expand Intermediate features. If it says “Enabled,” you can upload custom thumbnails.

Upload Steps

1. Sign in to YouTube Studio.
2. From the left menu, select Content. For a Short, select the Shorts tab at the top.
3. Click the video or Short you want to edit.
4. Under Thumbnail, click Upload file and choose your JPG or PNG. For regular videos, Get suggestions generates options instead.
5. Click Save.

Changes can take a little while to show up. Channels also have a daily custom thumbnail limit, which varies by country and channel history. If you see “Daily custom thumbnail limit reached,” try again in 24 hours.

Generate Thumbnails With Ask Studio

Ask Studio, the assistant inside YouTube Studio, can suggest thumbnails based on your video’s transcript and themes. Open it in your publishing workflow, type a prompt like “Create a thumbnail,” and click Add to attach your video or reference images. Follow-up prompts can change things like text size, then you pick from the suggestions.

A/B Test Your Thumbnails

YouTube Studio can test up to 3 thumbnails on the same video. Under Thumbnail, click A/B Testing, choose Thumbnail only (or title and thumbnail), and upload your versions. The test usually finishes within two weeks, and the version with the most watch time is shown to everyone.

It only works on a computer, your channel needs advanced features turned on, and Shorts can’t be tested yet. Changing the thumbnail mid-test stops it. Details are on YouTube’s A/B testing help page.

FAQs About YouTube Thumbnail Size

What Is the Ideal YouTube Thumbnail Size?

3840 x 2160 pixels at 16:9 for regular videos, with a minimum width of 640 pixels. Shorts use 2160 x 3840 at 9:16, with a minimum height of 640 pixels. Podcast playlists use a 1:1 square.

Is a YouTube Thumbnail 1920 x 1080?

It can be. 1920 x 1080 is a 16:9 image above the 640-pixel minimum, so YouTube accepts it. It is just smaller than the 3840 x 2160 YouTube now recommends.

What Size Is a YouTube Shorts Thumbnail?

2160 x 3840 pixels, a 9:16 vertical image, with a minimum height of 640 pixels. You can only add a custom Shorts thumbnail in YouTube Studio on a computer.

What Is the Maximum Thumbnail File Size?

50MB when you upload from a computer. From a phone, it is 2MB for video thumbnails and 10MB for podcast thumbnails.

What File Formats Does YouTube Accept for Thumbnails?

JPG or PNG. A high-quality JPG is the easiest way to keep a 4K thumbnail under the phone limit.

What Else Matters Besides the Thumbnail?

The title, the first few seconds of the video, and how you promote it. AI for YouTubers covers tools for the whole workflow, and how to promote YouTube Shorts covers getting vertical videos seen. To get more out of a finished video, the Video to Blog Post tool turns it into a written article.