. The png to base64 converter is identical to image to base64 with the only difference that it forces the mime type to be image png even if the uploaded file has a different content type or it cannot be detected. Please note that the png to base64 encoder accepts any images types with a size of up to 50 mb.

How To Store Huge Converted String Form Base64 To String In Android Stack Overflow
How To Store Huge Converted String Form Base64 To String In Android Stack Overflow from stackoverflow.com

So a base64 encoded 1x1 png pixel wastes 28 bytes.