How do I do that?

Can someone tell me, why it often happens, that when I copy the image URL, and link it to, the result is about a hundred lines of letters and other characters. It is very cumbersome to wipe them off.

Such as this: (Here is just a small part of the whole mess.)

data:image/jpeg;base64,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