Increase, decrease, or normalize audio volume — with a visual level meter, no upload
Drop audio file here or click to browse
MP3, WAV, FLAC, OGG, M4A — processed locally, never uploaded
Volume Booster lets you increase the volume of quiet audio files or normalize audio to a consistent level. Drop a quiet recording, boost the volume or normalize it, and download the result — all in your browser without any server.
Volume boost increases the entire signal by a fixed amount (for example +6 dB or 200%). Normalization analyzes the peak level and scales the volume so the loudest part reaches a target level (−1 dBFS here). Normalization is smarter — it prevents clipping while maximizing perceived loudness. When you boost manually past the ceiling, a soft limiter rounds off the peaks so the result stays clean instead of crackling.
Drop or select your file, pick Normalize or Manual Boost, and click "Apply & Process". The audio is decoded with the Web Audio API, gain is applied sample-by-sample directly in your browser, and the result is offered as a downloadable WAV. Nothing is uploaded.
Boosting quiet voice recordings from phone or laptop microphones. Normalizing podcast episodes to a consistent volume. Matching volume levels across multiple tracks. Making quiet audiobook chapters louder.
Need other edits? Try our Audio Trimmer, Speed Changer, Audio Converter, or Text to Speech.