YouTube Thumbnail Size Guide

The Ideal YouTube Thumbnail Size

• The ideal thumbnail size for YouTube thumbnail images is 1280 x 720 pixels
• The best aspect ratio for YouTube thumbnail images is 16:9
• The minimum size is 640 pixels wide

As the world’s largest video-sharing platform, YouTube is a primarily visual service. YouTube thumbnails, the small images that appear next to video titles, are a crucial aspect of the platform. These thumbnails serve as the visual preview or featured image for a video, much like a book cover. They can make the difference between someone clicking on your video or someone else’s.

This is especially true for anyone browsing YouTube. If your video has an attention-grabbing thumbnail, you’re more likely to catch the attention of anyone scrolling by. This can mean more traffic and potential subscribers to your channel. Therefore, it’s important to take control of your YouTube thumbnail images and not just rely on whatever YouTube chooses automatically.

With the enormous volume of videos on the platform, having a clear and compelling thumbnail image is one way you can make your video stand out and attract more viewers. To help you make the most of your YouTube thumbnail images, we have put together a guide that covers the ideal YouTube thumbnail size, the best file formats to upload, how to upload custom thumbnails, and YouTube thumbnail best practices.

Ideal YouTube Thumbnail Dimensions / Quick Guide

Here’s the quick version for the best dimensions to use for the YouTube thumbnail image.

• Ideal Dimensions: 1280 x 720 pixels
• Minimum Dimensions: 640 pixels wide
• Maximum file size: 2MB
• Image Files Formats: JPG, JPEG, GIF, PNG, BMP, and WebP

Best YouTube Thumbnail Size / Detailed Guide

Read on for a more detailed explanation and a guide on how to enable and use custom YouTube thumbnail images.

Why YouTube Thumbnail Images are Important

Your video’s thumbnail image works much like a book cover. It’s your video’s first impression.

With YouTube increasingly being a search platform with potentially millions of results, you’ll want your video to stand out from the crowd with an attention-grabbing (but accurate!) thumbnail image. It’s the image that potential viewers are going to see first—it’s even more prominent than the text of your video’s title.

It’s worth mentioning that the YouTube thumbnail image is different from your channel’s banner image. If you’re looking for the best YouTube banner size to use, I have a separate post on that.

Ideal Size for YouTube Thumbnails

There is some flexibility in the image size you can use for your YouTube thumbnail, but there’s also an ideal target to aim for to get the best results. And that is an image that is:

• 1280 pixels wide by 720 pixels tall

That’s not to say that it’s going to display at 1280 x 720 pixels. In fact, most of the time, it won’t. It’s much larger than is specifically required in many of the displays and lists on the YouTube site, and it’s larger than most mobile displays.

But that larger size maintains flexibility when the video is embedded on external websites as well as increasing the chances that it will stay sharp and crisp on high-density displays like Retina screens.

If you were to an image with a lower resolution, it could end up being pixelated and blurry in some displays.

The choice of 1280 by 720 pixels isn’t just some random size they picked out. It’s the dimensions of a 720p video, which is considered HD video (albeit the lowest threshold of what’s considered HD video) and is often a default playback resolution. ¹

Minimum Thumbnail Size for YouTube

YouTube says that the minimum size you can use for thumbnail images is 640 pixels.

In practice, that’s not a hard limit. You can actually upload an image smaller than that, and it will be accepted—you won’t get an error message. But it’s not recommended, and you can expect the image to be blurry for many users.

Image Aspect Ratio for YouTube Thumbnails

The best aspect ratio to use for your custom thumbnail is 16:9. You can upload a taller aspect ratio than that—say 4:3—and it will be accepted but will add black bars to either side. That is, it will fit the entire image into the box and pad the excess. Likewise, you can add a narrower image like a panorama, and it will automatically add black bars at the top and bottom to fill out the 16:9 aspect ratio.

An aspect of 16:9 has become the de facto standard for HD video, especially video that’s designed for online use. It refers to the ratio between the width and height of the image.

It’s what most cameras and phones will shoot in by default, and it’s the optimum aspect ratio for displaying on playback devices from TVs to smartphones to computer displays.

It’s worth noting that this isn’t necessarily an extra requirement you have to factor in. If you aim for the ideal dimensions of 1280 by 720 pixels, that is already an aspect ratio of 16:9. And if you were to grab a frame from your video, chances are the video was already shot in 16:9.

So, in short, the aspect ratio isn’t always something you need to worry much about. There are two times that come to mind when you wouldn’t need to consider it, though. One is if you’re grabbing a frame from a video shot in a different aspect ratio, such as 4:3.

Another is if you’re creating a custom illustration to use as your YouTube thumbnail. And especially if you’re using text on that graphic—you don’t want words or letters being totally or partially cropped out.

Maximum Size for YouTube Thumbnails

The maximum file size of images you can upload to use as a thumbnail image on YouTube is 2MB. If you upload a file that is larger than that, you’ll get a warning that “File is bigger than 2MB,” and it will be rejected.

Compatible File Formats for Custom Thumbnail Images for Your YouTube Videos

Your image can be in JPG (or JPEG), PNG, GIF (non-animated), and BMP image file formats.

There’s another, newer image format that some smartphones (e.g., iPhones) now use by default. And that is HEIC (for High-Efficiency Image Format). YouTube’s upload function won’t let you select a HEIC file, so you’ll first need to convert it to JPG.

You also can’t use RAW images (e.g., some examples of images with file extensions such as .dng, .nef, .crw, .arw, or .gpr). Those will have to be processed first and uploaded as JPGs.

How to Choose a Custom Thumbnail Image Thumbnail

By default, YouTube will let you choose from an automatically generated selection of still frames taken from the movie. You can also upload a custom thumbnail. That’s especially useful for using thumbnails that include title text or other useful and relevant graphics.

But a new YouTube account doesn’t have the option to upload and choose a custom thumbnail enabled by default. It is a feature you need to enable for your account first. To do that, you first have to verify your account. It’s presumably a way to reduce the amount of thumbnail spam on the platform.

How to Verify Your YouTube Account in Order to Enable Custom Thumbnail Images

The process to verify your YouTube account is a simple 2-step process. You’ll need to be able to receive the verification code on your phone.

Step 1: Log into YouTube.

Step 2: You can find the verification screen at https://www.youtube.com/verify

Step 3: Follow the instructions to select your country and to send the verification code via text or phone call.

Step 4: Enter the 6-digit verification code and hit Submit.

Step 5: You should then get a message that it was successful. Hit continue.

Step 6: You’ll then get a screen that shows a grid of badges showing your account’s status and enabled and eligible features. Custom thumbnails should now be enabled for all your videos.

How to Upload a Custom Thumbnail for a YouTube Video

To upload a custom video thumbnail, first, open the YouTube Studio.

Go to the video you want to work on and the Video Details > Basic tab.

About halfway down the page, you’ll find the Thumbnail section, and the left-hand box should be to “Upload thumbnail.”

Related to YouTube Thumbnail Sizes

So, now you have the perfect YouTube thumbnail! But the YouTube thumbnail is only one of the images that you can optimize for your videos. You can also add a custom banner to your YouTube channel; it’s sometimes known as channel art. I have a separate post on the YouTube banner size.

And if you’re looking for a good free option for making great-looking custom YouTube thumbnails, I’ve put together a detailed guide using Canva’s completely free version to create a YouTube thumbnail.

FAQs About YouTube Thumbnail Images

1. Many videos on YouTube have even higher resolution versions available. Examples include 1080p or 4K. And if you’re on a slow connection, you might initially see a much lower-resolution version. But 720p is typically a starting point and is a good compromise of sharp resolution, good playback size, and manageable file sizes for streaming data rates.[↩]