• STEP 1
Goto YouTube.com, Search for the video and then copy the video URL.
• STEP 2
Paste the URL here, which you have earlier copied, and click Submit.
• STEP 3
Choose the Thumbnail Quality to Download. (You can download thumbnail in Low, Medium, and High-Quality)
• STEP 4
Confirm the Download if prompted by the browser. That's it!
Of course it's 100% legal you can download any YouTube videos thumbnails but as you know thumbnail and video are copyrighted product you should take author permissions 1st in order to reuse that.
This YouTube thumbnail downloader website is going to work well in all devices except iPhone, because iPhone doesn't allow images to be saved in iPhone. But if you using jailbroken iphone then there is no any problem. on the other hand is going to work fine in almost all kinds Android devices and laptop or desktop system.
Whatever youtube screenshot you are downloading a copyright of respective on owner of that videos. If you want to use it in your work then you should ask for permission. Especially if you are reusing on YouTube then it's can create problem but if your plan is outside of YouTube. like use on website for creating logos or any Photoshop types of stuff then there is no any problem. You hardly receive any dmca complaint about related to that particular Youtube thumnail.g
Nope it's not, in short answer it's not seo friendly because almost all thumbnails which are on YouTube are indexed by Google. So which one is unique and which one is duplicate google know it. So it's not SEO friendly as you know. But you can do some stuff on that thumbnail I mean getting some unique effects using photoshop or any other software that can make your thumbnail unique again so that can be reused and make that seo friendly again.
You can hire a developer or visit cyberdemon.co for script