YouTube Shorts requirements
Anyone can create YouTube Shorts, you don’t have to wait for the special ‘Create a Short’ option to appear on your YouTube app. And your channel doesn’t need to have any specific number of views or subscribers. You can just upload your first video as YouTube Shorts.
Shorts video has to be to be less than 60 seconds
Although in most articles it is stated as the Shorts should be filmed in vertical format, YouTube accepts videos filmed in square format as Shorts as well. So make sure you film your Short videos in vertical or square format.
You can create and upload Shorts from any device you like. Your mobile, tablet, desktop or laptop…
Use #Shorts on your video title or description. YouTube officially recommends: “For a better chance of being shown on the Shorts shelf, include #Shorts in your video’s title if you’re using the Shorts camera. If you’re uploading a short video created somewhere else, include #Shorts in the title or description.”
But even if you don’t include #Shorts, YouTube will automatically recognise your video as a Short if it meets the requirements. And even if you have an old video on your channel that meets these requirements, YouTube will count it as Short and may feature it in the Shorts shelf.