How to Download a YouTube Thumbnail in HD
Get the full-size thumbnail of any public YouTube video or Short, understand the available sizes and use them properly.
Choose a download tool
Steps
Copy the video link, open the thumbnail downloader and paste it. The tool shows each available size. Use Open to view it in a new tab, or Download to save the image.
It also works for Shorts links.
Which size to use
MaxRes is 1280 by 720 and the best choice when it exists. Older or smaller uploads may not have it, in which case the standard (640 by 480) or high (480 by 360) version is used.
Small sizes such as medium and default are useful for previews.
Using thumbnails responsibly
A thumbnail is part of the creator's work. Use it for reference, commentary or with permission, and avoid presenting it as your own design. For your own channel, save your old thumbnails to review what performed well.
Conclusion
Paste a link, pick MaxRes, save the image and respect the creator's rights.
FAQ
What is the best thumbnail size?
MaxRes at 1280 by 720, when the video has one.
Does it work for Shorts?
Yes.
Can I use any thumbnail commercially?
Not without permission from the owner.