MsgBox, % UriEncode("http://foo bar/") ; Modified from http://goo.gl/0a0iJq UriEncode(Uri, Reserved:="!#$&'()*+,/:;=?@[]") { Unreserved := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.~" VarSetCapacity(Var, StrPut(Uri, "UTF-8"), 0) StrPut(Uri, &Var, "UTF-8") While (Code := NumGet(Var, A_Index - 1, "UChar")) { If InStr(Unreserved . Reserved, Chr(Code)) { Encoded .= Chr(Code) } Else { Encoded .= Format("%{:02X}", Code) } } Return Encoded }