Audio Volume Booster

Audio Volume Booster applies one fixed gain in decibels to a recording, anywhere from -30 dB to +30 dB, with a limiter to catch what would otherwise clip.

The gain is a flat multiplier applied by the volume filter, so every part of the track moves by the same amount. That makes this louder, not more even — a recording with whispered speech between loud bangs keeps that gap intact, because no compression is involved. When the gain is positive and the limiter is left on, a true-peak limiter follows it and holds peaks at about -0.26 dBFS; that prevents clipping but will flatten the loudest moments if you ask for more than the file has headroom for. Hiss and room noise rise by the same number of decibels as the voice, since the filter cannot tell them apart, and the limiter is skipped when the gain is negative because cutting volume cannot clip.

Five files can go through in one run, every one of them on your own hardware. There is no server in the path, so a faint recording of something private stays private while it is being made audible.

Rescuing a phone recording made from the back of a room, lifting a quiet voice memo so it carries on a speaker, pulling down a track that is louder than everything around it in a playlist, and raising an interview before it goes to someone to type up.

Also known as: boost audio volume · make mp3 louder · amplify sound