/ Free online tool — Volume booster
Drop a file.
Boost the volume.
Raise the level by up to +18 dB while a soft limiter holds the peaks at −0.3 dBFS. Preview both versions, download a WAV. Runs in your browser. No upload. No sign-up.
Click or drop audio.
WAV, MP3, FLAC, OGG, M4A, or AAC.
/ Method
How the volume booster
works.
Method: linear gain + soft-knee peak limiting at −0.3 dBFS · Built by Sample Vault · v1
Gain staging, a limiter, and honest level metering. The whole chain runs in your browser.
/ 01 — Gain staging
The slider applies plain linear gain: every sample gets multiplied by the same factor, so +6 dB roughly doubles the perceived level and +18 dB is a serious push. The peak and RMS readouts show exactly how much headroom your file had and where it ends up, so you can boost by the numbers instead of guessing.
/ 02 — The limiter
A soft-knee limiter sits after the gain with its ceiling at −0.3 dBFS. Anything below the knee passes through untouched. Peaks that would overshoot get rounded progressively toward the ceiling instead of being chopped flat, so the output never hard-clips no matter how far you push the slider.
/ 03 — Why clipping sounds bad
Hard clipping flattens the top of the waveform into square edges, which adds harsh high harmonics your ear reads as crackle. The soft limiter trades that for gentler saturation, but there is no free lunch: heavy boosts still trade loudness for distortion. Watch the "peaks rounded" figure. Near zero is transparent; whole percents you will hear.
/ 04 — Fully local
Your file never leaves your machine. The page loads once and runs offline thereafter. Useful for unreleased material, label stems, and anything you can't put through a third-party service.
/ Built by Sample Vault
One of the
free tools.
Sample Vault is a desktop sample browser that analyzes your whole library locally: key, tempo, loudness, character. This page is one of its free in-browser tools, built from the same audio plumbing.
/ 09 — FAQ
Volume booster — frequently asked questions
Loudness, distortion, and format questions, answered straight.