Googled “Elvish Translator” and found the site by the people who made the ring for the movie.

https://www.jenshansen.com/pages/online-english-to-elvish-engraving-translator

Problem:

The inscription on the ring isn’t Elvish. :)

"‘I cannot read the fiery letters,’ said Frodo in a quavering voice.

‘No,’ said Gandalf, ‘but I can. The letters are Elvish, of an ancient mode, but the language is that of Mordor, which I will not utter here."

You can write French in English letters, but that doesn’t make it English. 😉