There is no line break in a Pronto Hex string. It is one long line.

Your Browser displays one or more line breaks because the string is too long to fit without line breaks. But your browser knows the line breaks are not really there.

If you highlight and copy as Bruno suggested you get the string onto the Windows clipboard without adding any line breaks.

But if you move it through a program such as word, it will probably turn the displayed line breaks into real line breaks. Then the Pronto Hex is no longer valid.