Make quiet audio louder in your browser — increase the volume or one-click maximize to the loudest level without clipping. Free, no upload.
The volume booster makes quiet audio louder. Drop in a recording that plays too softly — a distant phone memo, a quiet interview, an under-recorded track — and either dial in a boost by ear or hit Maximize, which lifts the loudest peak right up to −1 dBTP, i.e. as loud as the file can go before it starts to clip and distort. A clip-safe cap keeps you from ever pushing the waveform past that ceiling.
Boosting is pure gain: it lifts everything equally, so any background hiss comes up with the voice — it can't separate the two. That makes it the right tool for "this is just too quiet," and the wrong one for matching a streaming loudness spec. If you need a track evened to Spotify, YouTube, or Apple targets (measured in LUFS, not just peak), the volume normalizer is built for exactly that. Everything here runs in your browser — your audio is never uploaded.
The booster just makes audio louder — you add gain, or hit Maximize to push the loudest peak up to −1 dBTP, as loud as possible without clipping. The normalizer instead evens a track to a specific loudness standard (Spotify, YouTube, and Apple targets measured in LUFS), which can mean turning a file up or down. Reach for the booster when something is simply too quiet; reach for the normalizer when you need to hit a streaming spec.
As loud as the Maximize button sets: it raises the true peak to −1 dBTP, just under the 0 dB point where the waveform would clip and distort. With the clip-safe cap on, the booster won't let you push past that ceiling no matter how high you drag the slider — it applies the largest boost that still stays clean. If a track is already near full scale, there's little headroom to boost, and Maximize will tell you so by adding almost nothing.
Boosting is pure gain, so it lifts everything equally — including any background hiss, hum, or room noise already in the recording. It makes a quiet recording louder; it can't separate the wanted sound from the noise floor. If a boosted file sounds hissy, that noise was always there, just quiet. For cleaning that up, the noise reducer is the right tool. Everything here runs in your browser, with nothing uploaded.