YouTube Thumbnail Size: Resolution, Ratio and Upload Limits
A thumbnail needs to work twice: as an image you can upload and as a tiny preview someone can understand. Start with the right canvas, then check the design at the size viewers will actually see.
Current YouTube thumbnail dimensions
| Use | Recommended canvas | Shape |
|---|---|---|
| Video thumbnail | 3840 × 2160 pixels | 16:9 |
| Shorts thumbnail | 2160 × 3840 pixels | 9:16 |
| Podcast playlist | Square canvas | 1:1 |
YouTube recommends these larger video and Shorts canvases, with a minimum video width of 640 pixels and minimum Shorts height of 640 pixels. A recommendation is not a promise that enlarging a small original will make it sharper.
The upload limit depends on the device
YouTube lists a 2MB mobile limit for video thumbnails and 10MB for podcast thumbnails. Desktop uploads allow up to 50MB for video, Shorts and podcast thumbnails. Use JPG or PNG. Custom Shorts thumbnails are added through YouTube Studio on a computer.
A file that fits a desktop upload may exceed the mobile limit. Check the downloaded file size before switching devices.
Resize your thumbnail in three steps
- Open the YouTube image resizer and select your original image.
- Choose the Thumbnail preset. It fills a 16:9 frame and crops overflow from the center. Crop your original first if the subject is off-center.
- Download the result, check the file size, and preview it in YouTube Studio. If necessary, compress a copy for a mobile upload.
Make a large image readable when it is small
Use one main subject and leave space around it. A headline that fills the entire canvas at editing size often turns into a stripe at feed size. Zoom your design out until it is only a few hundred pixels wide and check whether the subject and words still make sense.
Keep a clean original with editable text. Export the final copy once. Repeatedly downloading and editing a compressed thumbnail makes it harder to keep edges clean.
Why a correctly sized thumbnail can still look wrong
| Problem | What to check |
|---|---|
| Subject gets cut off | Crop composition before using the fixed-ratio preset. |
| Image is soft | Start from a larger original; avoid enlarging a small screenshot. |
| Upload is rejected | Check format, actual bytes, account eligibility and the upload device. |
| Colors or text look rough | Compare JPG and PNG exports at actual viewing size. |
Frequently Asked Questions
Is 1280 × 720 still a useful thumbnail size?
It has the same 16:9 shape and exceeds the published minimum width. The current recommendation is larger; use a sufficiently detailed source rather than stretching a small image just to reach that number.
Does this tool add text or design my thumbnail?
The resizer changes dimensions and output settings. Create the design first, then resize and check its readability.