The tool Batch Convert Audio Files allow you to quickly convert one kind of audio format into another. You can add multiple audio files at once and convert them simultaneously.
Supported input audio formats: .3ga, .8svx, .aac, .ac3, .aif, .aiff, .alac, .amb, .amr, .ape, .au, .aud, .avr, .caf, .dts, .eac3, .fap, .flac, .hcom, .ircam, .m4a, .m4b, .m4r, .maud, .mka, .mlp, .mp2, .mp3, .mpa, .mpc, .mpga, .nist, .oga, .ogg, .oma, .opus, .paf, .pvf, .qcp, .ra, .ram, .rm, .s3m, .shn, .sln, .snd, .sph, .spx, .tta, .voc, .w64, .wav, .wma, .wv, .wve, .xm
Supported output audio formats: .aac, .ac3, .aiff, .caf, .flac, .m4a, .mka, .mp3, .ogg, .opus, .wav, .wma