People use this YouTube thumbnail downloader website for getting thumbnail from any youtube videos. That can be used in presentation, animation work, or many other activities.
I have shared some screenshots in which I have guided you on how you can use this YouTube downloader website. It's quite easy; the first step is you just copy any YouTube link whose thumbnail you want. You can easily download YouTube cover images.
Now paste that URL in the input box, the moment you paste that link it's automatically going to generate different sizes of thumbnails for you. Now click on the thumbnail download button, and it's going to be automatically downloaded to your system. If you are using an Android phone, then you have to save those images, and if you are using an iPhone, then I don't know how you can do it?
Of course, it's 100% legal to download any YouTube video's thumbnails. But as you know, thumbnails and videos are copyrighted products, so you should take author permissions first in order to reuse them.
This YouTube thumbnail downloader website is going to work well on all devices except for iPhone because iPhone doesn't allow images to be saved on the device. But if you are using a jailbroken iPhone, then there is no problem. On the other hand, it's going to work fine on almost all kinds of Android devices and laptop or desktop systems.
Whatever YouTube screenshot you are downloading is a copyright of the respective owner of that video. If you want to use it in your work, then you should ask for permission. Especially if you are reusing it on YouTube, then it can create problems. But if your plan is outside of YouTube, like using it on a website for creating logos or any Photoshop types of stuff, then there is no problem. You hardly receive any DMCA complaint related to that particular YouTube thumbnail.
No, it's not SEO friendly. Almost all thumbnails on YouTube are indexed by Google, so Google knows which ones are unique and which ones are duplicate. So it's not SEO friendly, as you know. But you can do some stuff on that thumbnail, like getting some unique effects using Photoshop or any other software that can make your thumbnail unique again so it can be reused and made SEO friendly again.
YouTube short videos may have a different format for thumbnails, and they may not be as easily accessible as thumbnails for regular videos. Due to this difference, generating thumbnails for YouTube short videos can be more challenging. The availability of different thumbnail sizes for shorts may also vary. Keep in mind that YouTube's policies may restrict access to certain types of thumbnails.