Question about Encoding Different Languages with base64

I was having an issue with Base64 Encoding inside of the unreal engine using blue prints. I am encoding Korean characters and it is not an encoding that my php script understands. When i encode it on a few websites, the encoding is much longer (about 3 times longer) and it can be understood by my php script. I was wondering if there was any type of work around to this issue or something that I am not understanding correctly. Any help is greatly appreciated.