No. MP3 is already compressed, so converting it to WAV does not restore audio that was removed during compression.
Why convert MP3 to WAV at all?
A WAV copy can still be useful for compatibility with certain DAWs, hardware, or workflows that expect an uncompressed file format — even though the underlying audio data is still MP3-quality.
What Masterd supports
Upload an MP3 file, convert on Side B, and download WAV. Masterd handles uploaded audio files only — WAV, MP3, and M4A. No URL imports or unsupported formats.