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Looks like custom thumbnails are back!
To upload a custom thumbnail for an existing video:
- Go to your channel Video Manager.
- Locate a video and click the Edit button.
- Click the Custom thumbnail button and upload a thumbnail.
- Once the thumbnail is uploaded, don't forget to click the "Save Changes" button.
Custom thumbnail best practices
Size
Your custom thumbnail image should be as large as possible, as the image will also be used as the preview image in the embedded player. We recommend your custom thumbnails:
- Have a resolution of 1280x720 (with minimum width of 640 pixels).
- Be uploaded in image formats such as .JPG, .GIF, .BMP, or .PNG.
- Remain under the 2MB limit.
- Try to use a 16:9 aspect ratio as it's the most used in YouTube players and previews.
Read the full support article here »
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