Audio Volume Booster

How to use

1. 1Drop your audio file into the upload zone. MP3, WAV, OGG, M4A, AAC, FLAC, and WebM/Opus are all accepted, up to 200 MB.
2. 2Read the Source loudness panel. Peak and average (RMS) are reported in dBFS so you can see exactly how quiet the source is and how much headroom there is before 0 dBFS.
3. 3Pick a boost mode: Manual gain to set the dB amount yourself, Peak normalize to lift the loudest sample to a chosen ceiling, or RMS normalize to match a target average loudness.
4. 4Watch the preview waveform. Original is gray, boosted is blue, and the dashed red lines mark the ceiling. If the boost would clip, enable the soft limiter to round off the peaks smoothly.
5. 5Click Render WAV and then Download. The output is a 16-bit PCM WAV at the original sample rate and channel count, with a filename like clipname_boost_6.0dB.wav.

About this tool

Audio Volume Booster makes a quiet audio file louder using browser-native Web Audio API. Drop in an MP3, WAV, OGG, M4A, AAC, FLAC, or WebM/Opus clip and the tool decodes it, measures its peak amplitude and RMS energy, and lets you raise the level using one of three strategies. Manual gain takes a decibel value you pick yourself, from a -20 dB cut to a +30 dB boost, ideal when you already know how much louder the clip needs to be. Peak normalize automatically computes the exact gain that lifts the highest sample to a chosen ceiling (-0.1, -0.3, -1, -3, or -6 dBFS), which is the safe, distortion-free way to maximize loudness because no sample ever exceeds the ceiling. RMS normalize lifts the average energy of the clip to a target loudness (broadcast -23 dBFS, mastering -18 dBFS, podcast -16 dBFS, streaming -14 dBFS, and a few louder options), useful when the peaks are already in range but the perceived volume feels too quiet. An opt-in soft limiter shaped with a hyperbolic-tangent curve smoothly rolls samples back toward the ceiling instead of hard clipping them, so even an aggressive +24 dB boost stays musical. A side-by-side waveform shows the original signal in gray overlaid by the boosted signal in blue, with the target ceiling drawn as dashed red lines, so you can see at a glance how much headroom you are using and whether the limiter will engage. The output is a 16-bit PCM WAV file at the original sample rate and channel count, ready to drop into any editor, podcast host, video timeline, voice memo replacement, or audio device. Every step (decode, analyze, render) runs locally in your browser. The file is never uploaded, there is no rate limit, and no account is required.

Free to use. Works in your browser. No signup, no login.