Yes — I-AIFF yi-big-endian PCM apho i-WAV incinci-endian; isandi silingana, kwaye ukhetho luyimfuneko malunga nenkqubo ye-ecosystem evula ngaphandle kokukhathazeka. It is worth knowing before you overwrite an original you might need again.
No. Cima AIFF is free without an account, and nothing is added to the audio. The upload and the result are deleted automatically about 24 hours after the job, which leaves time to download the result.