GreekTranscoder is a program which converts polytonic Greek characters written using one text encoding into another one. Its primary goal is to allow the conversion of documents using older fonts and encodings into Unicode fonts. However, it also allows converting text between older encodings as well as from Unicode into those obsolete formats.
Currently GreekTranscoder supports the following legacy encodings:
And, of course, GreekTranscoder supports Unicode, using either composed or composing characters. The program lets you choose which option you wish to apply to your Unicode text. It also lets you conform to the TLG usage regarding Unicode codepoints which, according to the TLG, should be "deprecated". A Unicode text can be converted into Unicode itself with different conversion settings.