You write your screenplay in plain text annotated to indicate structure. Nellie formats your screenplay and converts it into a PDF file for US Letter size paper. Nellie recognizes a restricted subset of the Fountain markup language. Note that Nellie does not support languages other than English. Nellie does not embed fonts in its PDF output. Only the characters available in the standard Courier font will render. This is sufficient for English but not for other languages. Note that Nellie does support paper sizes other than US Letter.