Need a .m4a voice memo as an .mp3, or a compressed file converted to lossless .wav for editing? Convert Audio reads almost any audio format your browser can play and re-exports it as WAV or MP3.
Anything your browser can decode, which covers MP3, WAV, M4A, OGG, AAC, and most other common formats. If a file fails to load, your browser likely doesn't support decoding that specific codec.
Not yet. Those two cover the most common need (a lossless file or a small, widely compatible one). Other formats need their own encoder, which may come later.
Converting to WAV doesn't lose any quality beyond what the source file already had. Converting to MP3 is lossy, so going from one MP3 to another MP3 compresses it a second time, which can introduce a small amount of additional quality loss.
No. Decoding and re-encoding both happen locally in your browser. Nothing about your file is sent to a server.