Very much so. I-AAC yi-MP4-family lossy codec, ethetha kakuhle kune-MP3 kwi-bitrate efanayo ne-emiselweyo yezixhobo ze-Apple. That determines both the headroom available and whether the saving costs you anything in fidelity.
Yes — I-AAC ithatha ulibaziso lwe-encoder kwisiqulathi seefayili, ngoko ukutywina okunobuchule kungashiya imizuzwana emininzi yoxolo ekufuneka i-trim efanelekileyo isuse. It is worth knowing before you overwrite an original you might need again.
Ndingaqhuba i Cima AAC kwi AAC audio files ezininzi ngaxeshanye?
No. Cima AAC 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.