Tested out Franscriptor.com with some sample text from our content, to see what it's doing and to try to deduce how (it's a black box). It offers to "dissimiler" and "détilder" the text, but it's not clear exactly what that means. This is what I've learned:

• It does nothing with long s, so that has to be normalized before submission.
• It expands ligatures such as œ.
• It does quite a good job with u/v normalization, although it failed with "oeuures".
• Many anacronistic spellings survive unchanged ("luy", "bastir", "tousjours"), so it's clearly not trying to do modernization.