How to compose the URL for a reverse Google image search?

Question

I\'m managing a photo sharing website and as an admin I\'d like to have a button that checks the origin of the uploaded photo (for the sake of copyright infringements).

Answer 1

I think that the images are converted into base64 and then the base64 code is compared with other entries in the database. Is any other way to compare the data if it is not in some sort of digital / numerical form.