If controls = 1 and modestbranding = 0 (our change here), then the YouTube logo is smaller, is not on the video still image as a grayscale watermark in the lower right, and shows only when the controls are exposed as a white icon in the lower right. If controls = 1 and modestbranding = 1, then the YouTube logo is bigger, is on the video still image as a grayscale watermark in the lower right, and shows when the play controls are exposed as a big gray scale watermark in the lower right. All you get to do is choose how and when you want the logo to appear. There is no way to remove YouTube's logo from an embedded YouTube video, at least while the video controls are exposed. It turns out this is either a poorly documented, intentionally misleading, or undocumented interaction between the 'controls' param and the 'modestbranding' param. Showinfo is deprecated and will be ignored after September 25, 2018: There is still a small logo on the bottom left.

You can find all options on the Google Developers website. If you set the parameter value to 0, then the player will not display information like the video title and uploader before the video starts playing. Showinfo (supported players: AS3, AS2, HTML5) Note that a small YouTube text label will still display in the upper-right corner of a paused video when the user's mouse pointer hovers over the player. Set the parameter value to 1 to prevent the YouTube logo from displaying in the control bar. This parameter lets you use a YouTube player that does not show a YouTube logo. Modestbranding (supported players: AS3, HTML5)

You can add ?modestbranding=1 to your url.

How to make youtube watermark