A method, a computer program product, and a computer system for determination of encoding based on received code point classes are provided. The computer implemented method includes transferring data in a text form. The computer implemented method includes, in response to determining that decoding the data in text form passes, transferring some or all of the data in a binary form. The computer implemented method includes calculating code point class proportions for the data in the text form and the data in the binary form and determining a best form for transferring the data, based on comparison of the code point class proportions.