How do you change a YouTube thumbnail after uploading?

Sign in to YouTube Studio, click Content, and select your video. Under the Thumbnail section on the Details page, click the three-dot menu on your existing thumbnail, choose Change, select your new image, and click Save.

Can you change a YouTube Shorts thumbnail after publishing?

Currently, custom thumbnail uploads from desktop are not supported for published Shorts. You must choose your thumbnail frame from the mobile app during the initial upload.

Why can't I upload custom thumbnails on YouTube?

Custom thumbnail uploads require phone number verification under Intermediate Features in YouTube Studio Channel Settings. Unverified channels can only select auto-generated video stills.

Visual Packaging5 min read·Creovly 에디토리얼 팀·최종 검증일: November 2026

How to Change a YouTube Thumbnail, Step by Step

Step-by-step tutorial on how to change a thumbnail on YouTube: desktop Studio, mobile app, account phone verification, and Shorts thumbnail selection.

1. Phone verification: unlocking custom thumbnail uploads

Before you can upload a custom thumbnail to YouTube, your channel must have verified phone status. If your account is not verified, YouTube will only allow you to pick from three automatically generated freeze frames. To unlock custom thumbnails, go to YouTube Studio settings, select Channel > Feature eligibility, and complete phone number verification under Intermediate features.

핵심 요약: Complete standard phone verification in YouTube Studio settings to unlock custom thumbnail uploads.

2. How to change a thumbnail on desktop in YouTube Studio

To change a thumbnail on a computer, sign in to YouTube Studio. Click "Content" from the left menu and click on the video you want to edit. Under the "Thumbnail" section on the Video Details page, hover over your current thumbnail, click the Options icon (three vertical dots), and select "Change". Select your new 1280 × 720 image file and click "Save" in the top-right corner.

핵심 요약: In YouTube Studio > Content > Video Details, click the three dots on the thumbnail box and select "Change".

3. How to change a thumbnail on the YouTube Studio mobile app

Open the YouTube Studio app on iOS or Android. Tap "Content" in the bottom navigation bar and select the video. Tap the Edit icon (pencil) at the top of the screen, then tap the pencil icon in the upper-left corner of the thumbnail preview. Tap "Change" to select a new image from your device photos, crop if prompted, tap "Done", and select "Save". Remember that mobile uploads strictly enforce a 2 MB file limit.

핵심 요약: Tap the pencil edit icon in the YouTube Studio mobile app to replace your thumbnail on the go.

4. How to select or change a YouTube Shorts thumbnail

YouTube Shorts handle thumbnails differently than long-form videos. Currently, custom thumbnail uploads from desktop are not supported for published Shorts. Instead, you must select your thumbnail frame during the initial upload process in the YouTube mobile app. On the final upload screen, tap the pencil icon on your video preview and drag the frame selector to your desired moment. Once published, this frame serves as your Shorts thumbnail.

핵심 요약: Choose your Shorts thumbnail frame during mobile upload; desktop custom thumbnail replacement is not currently supported for published Shorts.

5. Technical preparation: dimensions and compression

For optimal visual quality, prepare your image to 1280 × 720 resolution (16:9 aspect ratio) using Creovly’s YouTube Thumbnail Resizer. Ensure the file weight is under 2 MB with our YouTube Thumbnail Compressor to avoid mobile upload rejections. For full CTR optimization strategies, read The YouTube Thumbnail Blueprint.

핵심 요약: Format thumbnails to 1280 × 720 and compress below 2 MB before uploading to ensure fast processing and zero upload errors.

실전 시나리오단계별 상세 분석

Replacing an Underperforming Thumbnail to Boost CTR

상황 설정: A creator notices that a video published 48 hours ago has a 2.1% click-through rate. They design a higher-contrast thumbnail with clearer focal text and need to replace the live image without losing views or analytics.

실행 절차

01Format new artwork: Export the revised thumbnail at 1280 × 720 pixels in JPG format.
02Compress under 2 MB: Run the file through Creovly Thumbnail Compressor, reducing size to 510 KB.
03Open YouTube Studio: Navigate to Content, click the video, and locate the Thumbnail panel.
04Execute replacement: Click the three-dot menu on the existing thumbnail, select "Change", upload the new file, and click "Save".
05Monitor response: Track Impressions click-through rate in YouTube Studio analytics over the following 72 hours.

시사점: The replacement thumbnail goes live immediately across YouTube search and recommendations without resetting video view counts or comments.

실행 체크리스트

발행 전 최종 확인

완료: 5개 중 0개

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Account Verification
Confirm phone verification is completed in YouTube Studio Channel Settings.
Recommended Dimensions
Format image to 1280 × 720 pixels with a 16:9 aspect ratio.
File Size Compliance
Ensure file is under 2 MB for mobile Studio compatibility.
Format Selection
Use JPEG or PNG format with an sRGB color profile.
Save Confirmation
Click Save in YouTube Studio and verify the thumbnail renders on the public watch page.

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