The minimum required output format for releasing a track with LANDR Release is 44.1kHz/16bit WAV format.
Keep in mind that mastering an MP3 file into a WAV won’t actually improve the original audio quality. You’re just getting an MP3 in disguise. MP3s can be useful for easy sharing, but they lack the audio fidelity needed for official releases.
We can accept files with higher sample rates and bit depths, however, the DSPs do not support files above 24 bits. When you distribute files with bit rates higher than 24, we will downsample them to 24 in order to meet the stores’ requirements.
Read more about formats here.