I think that colloquially “the file contains a UTF-8 string” is best, but perhaps not in more formal communications.
On Wed, May 15, 2019, 7:24 AM Costello, Roger L. via Unicode < unicode@unicode.org> wrote: > Hello Unicode experts! > > Which is correct: > > (a) The input file contains a string. The string is encoded using UTF-8. > > (b) The input file contains a string. The string is encoded with UTF-8. > > (c) The input file contains a string. The string is encoded in UTF-8. > > (d) Something else (what?) > > /Roger > >