How to boost audio volume online
Load your audio
Drop in an MP3, WAV, M4A, OGG or FLAC file. It's decoded on your device — nothing is sent to a server.
Boost the level
Drag the slider up, or hit "Auto" for the maximum safe boost. Keep clipping protection on to avoid distortion.
Download the result
Export the louder audio as MP3 or lossless WAV, processed right on your device.
What does "dB" mean here?
Decibels (dB) are how audio level is measured. +6 dB is roughly twice as loud in perceived terms; +3 dB doubles the power. Small numbers make a real difference — a boost of +3 to +6 dB is often plenty for a quiet recording.
What is clipping, and why the limiter?
If you push the level past the maximum a digital file can hold, the tops of the loudest peaks get chopped off ("clipped"), which sounds like harsh crackle or distortion. The built-in limiter gently tames those peaks so you can get louder without that distortion. Leave it on unless you have a specific reason not to.
What does the "Auto" button do?
It finds the loudest peak already in your file and sets the boost to the maximum amount that won't clip — a clean, safe "normalize to full scale". It's the fastest way to make a quiet file as loud as it can go without distortion.
Can I make an already-loud file even louder?
Yes, but there's a ceiling before it distorts. With the limiter on you can push past that ceiling for extra loudness while keeping peaks under control; without it, large boosts on an already-loud file will clip.
Are my files uploaded anywhere?
No. Decoding, boosting, and encoding all happen locally in your browser using the Web Audio API. Your audio never leaves your device.