What to choose for imposing a "watermark" on the picture?

Question

Watermark

Greetings! The plans are to create a site, the meaning of which will be that one user uploads a picture, a watermark is superimposed on it, the second user pays for the picture and receives it without a watermark.
The question is: now there are many technologies for combining images (JS, HTML canvas, PHP, etc.), so which one is better to choose and learn how to work with images in order to implement a similar site, the essence of which I described above?

Answer 1

ImageMagick watermark