On this page
- How do you change a YouTube thumbnail on desktop?
- How do you change a YouTube thumbnail on mobile?
- Should you set the thumbnail during upload or after publishing?
- Why is the option to change the thumbnail missing?
- Does changing a YouTube thumbnail hurt the video?
- When should you change an underperforming thumbnail?
- Should you use Test & Compare instead of swapping manually?
- FAQ
Quick answer
To change a YouTube thumbnail, open YouTube Studio, go to Content, select the video, and open its Details page. In the Thumbnail section, choose Upload file, pick a 1280 × 720 image under 2 MB, and click Save. On a phone, edit the video in the YouTube Studio or YouTube app. Your account must be verified.
Key takeaways
- Desktop: Studio → Content → video → Details → Thumbnail → Upload file → Save.
- No upload option usually means your account isn't verified yet.
- Changing a thumbnail doesn't reset views or penalize the video.
- Judge a swap against your own channel's typical CTR, not generic benchmarks.
- Test & Compare tests up to three thumbnails and picks a winner by watch time.
How do you change a YouTube thumbnail on desktop?
Desktop YouTube Studio gives you the most options: custom upload, auto-generated frames, and Test & Compare. YouTube moves buttons around from time to time, but the path has stayed roughly the same for years.
- 1
Open YouTube Studio
Go to studio.youtube.com and sign in to the channel that owns the video.
- 2
Go to Content and select the video
Click Content in the left menu, find the video (use the filter or search for older uploads), and click its title or the pencil icon to open Details.
- 3
Find the Thumbnail section
Below the title and description you'll see the current thumbnail and a few auto-generated frames from the video.
- 4
Upload your new image
Click Upload file (or the options menu on the current thumbnail and choose to change it), then pick your image. Use a 1280 × 720, 16:9 JPG or PNG under 2 MB; the YouTube thumbnail size guide has the full spec.
- 5
Save
Click Save in the top-right. The new thumbnail can take a little while to show everywhere because of caching, so don't panic if the old one appears for a few minutes.
How do you change a YouTube thumbnail on mobile?
You can change a thumbnail from your phone using either the YouTube Studio app or, increasingly, the main YouTube app, which has been absorbing Studio editing features. The exact labels vary by app version and platform, but the flow looks like this.
- 1
Open the video's edit screen
In YouTube Studio, tap Content and select the video. In the YouTube app, go to your profile (You) → Your videos, then tap the menu on the video and choose Edit.
- 2
Tap the thumbnail
Tap the current thumbnail or the pencil icon over it to open the thumbnail options.
- 3
Choose a custom thumbnail
Select Custom thumbnail (or similar), grant photo access if asked, and pick the image from your camera roll.
- 4
Confirm and save
Tap Select to confirm, then Save. Keep mobile uploads under 2 MB, since larger files may be rejected on mobile upload paths.
Should you set the thumbnail during upload or after publishing?
The best time is during upload. In the upload flow, the Details step includes the same Thumbnail section with Upload file, so you can set your custom image before the video is ever seen. If you publish with an auto-generated frame, the first wave of impressions (often the most important, when subscribers and notifications kick in) goes out with a thumbnail you didn't design.
If you schedule videos, upload the final thumbnail at upload time as well. You can still replace it afterward at any point, but it's better if your strongest version is live for that first push.
Before uploading, check the image in a realistic feed. The free YouTube Thumbnail Previewer shows your draft in home, search, Up next, and mobile layouts with your real title and duration, so you catch problems before the first impressions go out.
Why is the option to change the thumbnail missing?
If you only see auto-generated frames, or the upload button is grayed out, one of these is usually the reason.
- Your account isn't verified. Custom thumbnails require verification. In YouTube Studio, go to Settings → Channel → Feature eligibility and complete phone verification to get access to intermediate features.
- Restrictions on your channel. Community Guidelines strikes and other account restrictions can limit access to some features. Feature eligibility in Studio shows what's currently available.
- It's a Short. Shorts covers are usually picked from a frame of the video, and custom Shorts thumbnail options have been limited. Check the current options in Studio for that Short.
- The file was rejected. An upload error usually means the file is too large or not a supported format (JPG, PNG, GIF, or BMP). Re-export as a JPG under 2 MB.
- You're not an owner or editor. Channel permissions with view-only roles can't edit video details.
- A browser or app glitch. Try another browser, disable extensions that alter YouTube pages, or update the app.
Does changing a YouTube thumbnail hurt the video?
No. Changing a thumbnail doesn't reset views, comments, watch history, or the video's age, and YouTube doesn't penalize you for it. Creators routinely swap thumbnails on both new and old videos.
What does change is how the video performs from that point on. A better thumbnail can raise click-through rate on new impressions; a worse one can lower it. That's why it's worth swapping deliberately and watching the numbers, rather than changing it every few hours.
One caution: avoid flipping back and forth many times in a short window. It makes the data impossible to read, because you can't tell which version caused which result.
When should you change an underperforming thumbnail?
Wait until the video has had a fair shot. For most channels, that means looking at the first 24-72 hours, when subscribers, notifications, and early recommendations deliver most of the initial impressions. Judging after two hours is mostly noise.
Then open the video's Analytics → Reach tab and look at two numbers together: impressions (how often the thumbnail was shown) and impressions click-through rate (how often those showings became views). Compare them with your channel's typical numbers for videos of the same age, which Studio shows in its comparisons with your recent uploads.
| What you see after 24-72h | What it usually means | What to do |
|---|---|---|
| Impressions normal, CTR well below typical | YouTube is showing it, viewers aren't choosing it | Strong case for a new thumbnail (and maybe title) |
| Impressions low, CTR normal or high | Packaging works, reach hasn't arrived | Give it more time before changing anything |
| Impressions and CTR both low | Topic may not suit the audience, or packaging is weak | Try a new thumbnail, then reassess the topic |
| CTR high, average view duration low | Thumbnail may overpromise | Make the thumbnail match the video more closely |
Should you use Test & Compare instead of swapping manually?
If your channel has access, often yes. Test & Compare in desktop YouTube Studio lets you test up to three thumbnails, titles, or title and thumbnail combinations on one video. YouTube splits impressions roughly evenly between versions and picks the winner by watch time share, not CTR, which rewards thumbnails that attract viewers who actually stay.
Tests usually take a few days and can run up to about two weeks. The result is labeled Winner, Performed same, or Inconclusive. Manual swaps are still useful when you don't have access, or when the current thumbnail is clearly broken and you want to fix it immediately rather than wait for a test.
Our thumbnail A/B testing guide covers how to design variants that are different enough to produce a clear result, and YouTube thumbnail mistakes that cost clicks is a good checklist for what to change in the new version.
Frequently asked questions
How do I change my YouTube thumbnail after uploading?
Open YouTube Studio, go to Content, select the video to open Details, then in the Thumbnail section click Upload file, choose your image, and click Save.
Can I change a YouTube thumbnail on my phone?
Yes. Edit the video in the YouTube Studio app or the YouTube app, tap the thumbnail, choose a custom thumbnail from your photos, and save. Keep the file under 2 MB.
Why can't I change my YouTube thumbnail?
The most common reason is an unverified account. Complete phone verification under Settings, Channel, Feature eligibility in YouTube Studio to enable custom thumbnails.
Does changing a thumbnail reset views on YouTube?
No. Views, comments, and the video's history stay the same. Only future impressions see the new thumbnail.
How long should I wait before changing a thumbnail?
Give it roughly 24-72 hours so the initial impressions come in, then compare impressions and click-through rate with your channel's typical numbers for videos of the same age.
How long does it take for a new thumbnail to show up?
Usually a few minutes. Cached versions can linger briefly in some places, so the old thumbnail may appear for a short time after you save.
Can I change the thumbnail of a YouTube Short?
Shorts covers are usually chosen from a frame of the video, and custom thumbnail options for Shorts have been limited. Check YouTube Studio for what's available for your Short.