So if you tried to paste an invalid value but it's not, this will give you an error to not pasting invalid hexadecimal values and paste special option may not work like that. If you got this online for now, we have a tool called "Hex Paster"! Hex paster detects the letters and numbers expecting 0123456789abcdefABCDEF. But also, it removes anything with expecting Hex Symbols in single period! Or eventually you can download this file without any software to be pasted. HxD is a good software ever.