Free tools usually support only MP3 or WAV. A full version handles everything:
Low-quality normalizers simply push the gain until the waveform flattens (clips), creating harsh digital distortion. A professional includes a true-peak limiter and dynamic compression options. It intelligently boosts quiet parts while taming peaks, ensuring a clean, non-fatiguing listening experience.
Choose between Peak Normalization (for individual track safety) or Loudness/RMS Normalization (for uniform volume across multiple tracks).