How to use it
- Drop the MP3.
- Choose WAV 16-bit (CD), 24-bit, or 32-bit float.
- For audio CDs, set the sample rate to 44.1 kHz and channels to stereo.
- Export; the WAV is re-read to confirm its length.
- Download.
What the WAV contains
The MP3 is decoded by your browser at its native sample rate, so no extra resampling happens on import. The resulting PCM samples are written to a standard RIFF WAV. Expect the WAV to be about ten times the MP3 size, and to include the few milliseconds of encoder padding the MP3 had at its start and end.
32-bit float WAV preserves decoded values exactly, including any overshoot above 0 dBFS that MP3 decoding can produce; 16-bit and 24-bit round and clip to the integer range.
Questions
Will the WAV sound better than the MP3?
It sounds identical. Converting avoids further loss when editing but cannot recover detail removed by MP3.
Which bit depth do I need?
16-bit for CDs and general use; 24-bit or 32-bit float if you will process the audio further.
Can I trim before converting?
Yes, select the range and press Trim, or choose Export → Selection only.