The greektonoi mapping extends the betababel package or the babel polutonikogreek option to provide a simple way to insert ancient Greek texts with diacritical characters into your document using a similar method to the commonly used Beta Code transliteration, but with much more freedom. It is designed especially for the XeTeX engine and it could also be used for fast and easy modification of monotonic greek texts to polytonic. The output text is natively encoded in Unicode, so it can be reused in any possible way. The greektonoi package provides, in addition to inserting greek accents and breathings, many other symbols used in greek numbers and arithmetic or in the greek archaic period. It could be used with greektonoi mapping or indepedently.