You can change a YouTube thumbnail on desktop or mobile, but desktop gives you more control

To change a thumbnail on a video you uploaded, go to YouTube Studio, find the video in your uploads, and click the thumbnail image to replace it. You can upload a new image file from your computer, or use one YouTube generated automatically when you uploaded the video. The change takes effect when ready, though it may take a few minutes to show up across YouTube's servers.

On mobile, you can only choose from thumbnails YouTube created for you during upload — you cannot upload a custom image. If you need to use a custom thumbnail, you must do it from a computer or tablet with a web browser.

Key Takeaways

  • Desktop YouTube Studio lets you upload a custom thumbnail image, but mobile only lets you pick from YouTube's auto-generated options.
  • Custom thumbnails must be under 2 MB, in JPG, GIF, or PNG format, and at least 1280 × 720 pixels for best quality.
  • Your account needs to be verified with a phone number before YouTube will let you upload custom thumbnails.
  • The thumbnail change shows up right away on your video page, though it may take a few minutes to appear in search results and recommendations.

How to change a thumbnail on desktop

Open YouTube Studio in a web browser and sign in to the account that owns the video. Click Videos in the left menu to see all your uploads. Find the video you want to change and hover over its thumbnail — a pencil icon will appear in the corner. Click the pencil icon.

A box will open showing three options: the current thumbnail, and two other images YouTube captured from your video. Click the thumbnail you want to use. If none of those three work, click Upload custom thumbnail to choose an image file from your computer instead. Select the file and click Save.

Requirements for custom thumbnail images

YouTube accepts JPG, GIF, and PNG files. The image must be smaller than 2 MB. For the sharpest display, use an image that is at least 1280 pixels wide and 720 pixels tall — this is a 16:9 ratio, which matches how YouTube displays thumbnails on most devices.

You do not need to match that size exactly. YouTube will resize your image to fit, but if your image is much smaller than 1280 × 720, it may look blurry on large screens. Many creators use 1280 × 720 or larger so the thumbnail stays crisp on phones, tablets, and computers.

Verify your account before uploading custom thumbnails

YouTube requires account verification before you can upload a custom thumbnail. If you try to upload one and see a message saying the feature is not available, your account is not yet verified.

To verify, go to YouTube Studio, click your profile picture in the top right, and select Create a channel or Settings depending on your account type. Look for Channel in the left menu, then Verification. Follow the prompts to verify by phone — YouTube will send you a code by text or call. This usually takes a few minutes, and the feature becomes available right after.

How to change a thumbnail on mobile

Open the YouTube app and tap your profile picture, then tap Create a channel or go to Your channel. Tap Videos to see your uploads. Find the video and tap the three dots next to it, then tap Details.

Scroll down to the thumbnail section. You will see three images YouTube created when you uploaded the video. Tap the one you want to use. You cannot upload a custom image from mobile — if you need to use a custom thumbnail, open YouTube Studio on a computer instead.

When the thumbnail change takes effect

The new thumbnail appears on your video's page right away. However, it may take a few minutes to show up in YouTube's search results, recommendations, and your channel page. This delay happens because YouTube's servers need time to update everywhere the thumbnail appears.

If you change the thumbnail multiple times in a short period, YouTube may take longer to update. Most changes are visible within 5 to 15 minutes, but in rare cases it can take up to an hour.

Tips for thumbnails that get clicks

The thumbnail is often the first thing someone sees before deciding whether to watch. Use high contrast — bright colors next to dark ones stand out better in search results and recommendations. Include text, but keep it to a few large words that are readable at thumbnail size (which is often just 168 × 94 pixels on a phone).

Avoid cluttering the image with too many elements. A clear face, a bold color, or a straightforward object usually works better than a busy design. Test your thumbnail at actual thumbnail size by viewing it on your phone before you upload it — what looks fine on your computer screen may be unreadable when shrunk down.

Frequently Asked Questions

Can I change a thumbnail after the video is already published?

Yes. You can change the thumbnail at any time, even years after uploading. The new thumbnail takes effect when ready on your video page and usually appears in search results within a few minutes.

What if I do not have a verified account?

You can still change the thumbnail to one of the three images YouTube created during upload. To upload a custom image, you must verify your account by phone first. This takes a few minutes and is a one-time step.

Can I use someone else's image as my thumbnail?

You can, but you need permission from the copyright holder. Using an image without permission may result in a copyright strike on your channel. It is safer to create your own thumbnail or use images you have the right to use.

Why does my custom thumbnail look blurry?

Your image is probably smaller than 1280 × 720 pixels. YouTube stretches small images to fit, which makes them look fuzzy. Create or find a larger image, or resize your current one to at least 1280 × 720 before uploading.

Does changing the thumbnail hurt my video's performance?

No. Changing the thumbnail does not affect your video's watch time, ranking, or recommendations. A better thumbnail may actually bring in more viewers because more people will click on it.