Understanding MP3 & WAV Formats
MP3 is a compressed, lossy format made for small files; WAV stores audio uncompressed, which editing programs and many hardware devices expect.
When to Convert MP3 to WAV
Convert to WAV when a program or device asks for it: some video editors, DJ equipment, samplers, phone systems and CD burning tools work only with WAV. It is also a good idea before repeated editing, because a WAV can be saved again and again without further loss, whereas every new MP3 export removes a little more.
Will the Audio Sound Better as WAV?
No. The detail that was removed when the MP3 was made cannot be brought back. The WAV will sound exactly like the MP3 and be several times larger. What you gain is compatibility and a format that does not degrade further when you edit it.
16-Bit or 24-Bit?
16-bit is the CD standard and is accepted by every program and device; choose it unless you have a reason not to. 24-bit leaves more room for later processing in an editing program, at one and a half times the file size. Neither adds detail that the source file did not have.
Convert Several Files at Once
You can add up to 20 files in one go. They are converted one after another on your device, and each one gets its own download button; Download All saves them all. The sample rate and the channels of each file are kept: nothing is resampled, and mono stays mono.