How this MP3 volume booster works
The tool decodes your audio file using the Web Audio API (built into every modern browser), applies the gain you chose, and re-encodes the result back to MP3 or WAV. The processing happens entirely on your device — your file never leaves your computer or phone.
When you push gain above 0 dB, audio can clip — that nasty distortion you hear when something is too loud. We use a soft-knee limiter (DynamicsCompressor) that squashes loud peaks before the gain is applied, so the boost makes everything louder without ever clipping. It's the same technique mastering engineers use in pro tools.
How much should you boost?
- +3 dB — barely noticeable lift, safe for already-loud content.
- +6 dB — clearly louder, doubles perceived volume.
- +12 dB — significantly louder, common for quiet recordings.
- +18 to +24 dB — extreme boost. Only useful for very quiet recordings; expect some compression artifacts.
If you can't hear the boost clearly, your original file might already be near maximum loudness. Try our LUFS standards page to check what loudness target your platform uses.
Supported file types
MP3, WAV, M4A, AAC, OGG, and FLAC work on every modern browser. Video files (MP4, MOV) won't work here directly — for video, use the Loudify app or our video volume booster guides.