A B/C Compare Compare audio files

How it works

A free tool for musicians, producers and audio engineers. Play up to three versions of a WAV file in sync, switch between them without gaps and listen at matched loudness, for example master, mix and a loud bounce of the mix.

• 3 versionsreference and two more
• sample-accuratealigned automatically
• LUFSloudness matched
• localnothing is uploaded

• All versions play at the same time, in sample-accurate sync. Switching uses a 5 ms crossfade, so there's no gap and no click.
• The first row is the reference, and its timeline applies to all. Every other version is aligned to the reference waveform by cross-correlation, even if a master has a trimmed start or more pre-roll.
• Inverted polarity, which can happen with analog mastering, is detected and corrected per channel.
• Loudness: integrated loudness according to ITU-R BS.1770, measured over the range all versions have in common. Louder versions are turned down to match the quietest one. Nothing is ever turned up.
• Your files never leave your computer. The tool runs entirely in your browser.

Keyboard shortcuts

• Play and stopSpace
• Listen to the first, second or third row123
• Toggle between the last twoA
• Back to startL
• Move the active version 1 sample left or right,.
• Loudness matching on or offN
• 5 seconds back or forward←→