You can convert the WEBM back to AIFF on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
Ko si. Oluyipada n ṣiṣẹ ni kikun ni oju opo wẹẹbu rẹ ati pe afẹfẹ wa - ko si plugin, ko si fifi sori ẹrọ, ko si awọn ẹtọ admin. O ṣiṣẹ lori Windows, macOS, Linux, ChromeOS, iOS, ati Android.
Yes. Every conversion this site offers is also exposed via a JSON API — see /api/ for endpoints, authentication, and rate limits. AIFF to WEBM is one of the supported pairs.