Thumbnail problems
No custom thumbnail on YouTube Shorts: verified accounts only
Short answer
If YouTube gives you no thumbnail option on a Short, the reason is in YouTube's own documentation: custom thumbnails for Shorts are currently only available to add in YouTube Studio on a computer, and your account must be verified to use the feature. Where it is available, YouTube recommends 9:16, up to 2160 × 3840 pixels, with a minimum height of 640 pixels, in JPG or PNG. Until then, YouTube generates the thumbnail from the video.
Key takeaways
- Custom Short thumbnails: YouTube Studio on a computer, verified account.
- Recommended 2160 × 3840 at 9:16; minimum height 640 px.
- Formats: JPG or PNG; up to 50 MB when uploaded from a desktop.
- A/B testing of titles and thumbnails does not include Shorts.
- Until a custom thumbnail exists, the frame YouTube chooses is your cover: make the first second work.
Find your case
| What you see | What it usually means | Do this |
|---|---|---|
| No thumbnail option on a Short | Not on a computer, or the account is not verified | Open Studio on a computer and check verification (step 1) |
| Option is there but the upload fails | The image is not a supported format or size | Use JPG or PNG within the published limits (step 3) |
| Custom thumbnail ignored on mobile | Vertical videos with a 16:9 custom thumbnail get an auto-generated 4:5 one on some surfaces | Upload 9:16 for a Short (step 4) |
| Thumbnail looks soft | The image is below the resolution YouTube wants | Export at 2160 × 3840 where you can (step 3) |
| Thumbnail disappeared | A policy strike removed custom thumbnail privileges | Read the policy categories (step 5) |
| Daily limit error | YouTube caps custom thumbnail uploads per channel per day | Wait 24 hours (step 5) |
Fix it step by step
Check the two conditions YouTube publishes
YouTube states that custom thumbnails for Shorts are currently only available to add in YouTube Studio on a computer, and that your account must be verified to use the feature. You can add a custom thumbnail to a Short when uploading it on a computer or after it is uploaded.
YouTube StudioContentShortsvideoThumbnailUpload file
Use the published ratio for a Short
For Shorts, YouTube recommends a 9:16 aspect ratio and a resolution of 2160 × 3840 pixels, with a minimum height of 640 pixels. The published minimum implies a width of about 360 px at 9:16, which is 640 ÷ 16 × 9 = 360 px.
Export a JPG or PNG inside the size limits
YouTube recommends uploading thumbnails in image formats such as JPG or PNG. Size limits depend on the device: 2 MB for video thumbnails on mobile, and 50 MB for video, Shorts and podcast thumbnails on desktop. Export at the target pixel size rather than scaling up a small image.
Do not upload a 16:9 thumbnail to a vertical video
YouTube publishes a specific behavior here: vertical videos with a 16:9 custom thumbnail are replaced by an auto-generated 4:5 thumbnail on the home, explore and subscription pages, while your custom thumbnail still appears on the watch feed, watch history and non-mobile platforms. For a Short, upload 9:16.
Know the rejection and limit rules
YouTube publishes the categories that get a custom thumbnail rejected and can strike an account, says repeat offences may remove the custom thumbnail privilege for 30 days or lead to account termination, and documents a daily upload limit: if you see "Daily custom thumbnail limit reached", try again in 24 hours.
Fix the generated frame while you wait
If you are not verified yet, the thumbnail is generated from the video, so the picture is all you control. Trim the empty first half second and start on the frame that says what the Short is about:
ffmpeg -i in.mp4 -ss 00:00:00.4 -c copy trimmed.mp4.
YouTube Shorts thumbnail values, as published
| Where | YouTube Studio on a computer · mobile and tablet apps do not offer it |
|---|---|
| Account | Must be verified |
| Recommended | 2160 × 3840, 9:16 |
| Minimum | Height 640 px · about 360 px wide at 9:16 |
| Formats | JPG or PNG |
| Size limits | 2 MB on mobile, 50 MB on desktop |
| A/B testing | Not available for Shorts |
The eligibility chain, in order
- Account verified? If not, a custom thumbnail is not available at all.
- On a computer in YouTube Studio? The Short thumbnail control is not in the mobile or tablet app.
- Right file? JPG or PNG, within 2 MB on mobile or 50 MB on desktop.
- Right ratio? 9:16, because a 16:9 custom thumbnail on a vertical video is replaced on several surfaces.
- Then check it after a little while: YouTube says thumbnail changes can take time to appear.
Frequently asked questions
Why can I not add a custom thumbnail to my Short?
YouTube documents two conditions: custom thumbnails for Shorts are only available in YouTube Studio on a computer, and the account must be verified. If either is missing, YouTube generates the thumbnail instead.
What size should a Shorts thumbnail be?
YouTube recommends 2160 × 3840 at 9:16 with a minimum height of 640 pixels, in JPG or PNG.
Why was my custom thumbnail replaced on the Shorts feed?
YouTube publishes that vertical videos with a 16:9 custom thumbnail are replaced by an auto-generated 4:5 thumbnail on the home, explore and subscription pages. Upload a 9:16 thumbnail for a Short.
How many thumbnails can I upload per day?
YouTube publishes a daily custom thumbnail limit per channel and says that if you get "Daily custom thumbnail limit reached" you should try again in 24 hours.
Sources
- YouTube Help: Add custom thumbnails on YouTube (official, checked 2026-10-07)
- YouTube Help: A/B test titles & thumbnails (official, checked 2026-10-07)
- FFmpeg Documentation: Command line options (-map, -c copy, -itsoffset) (official, checked 2026-10-07)
Reviewed 2026-10-07. Steps not attributed to a source are general video practice or computed above.