Audio Volume Booster
Make audio louder or quieter (0.5×–4×) with optional loudness normalization, in your browser. Free, private, no signup or upload.
About the Audio Volume Booster
This free audio volume booster raises or lowers the loudness of any audio file with a simple slider from 0.5× (half as loud) to 4× (much louder). It is perfect for quiet voice memos, interviews recorded far from the mic, or tracks that are simply too soft. An optional loudness normalization pass evens out the difference between quiet and loud sections so nothing gets buried.
Processing runs entirely in your browser using FFmpeg WebAssembly, so your audio never leaves your device. The engine (about 30 MB) is downloaded from a CDN on first use and cached, which is why the first run takes longer than later ones. The output keeps your original format where possible — WAV stays WAV, and MP3/M4A come back as MP3/AAC.
One honest caveat: boosting volume amplifies everything, including background noise, and pushing well past 2× can cause clipping (a harsh, distorted sound) on already-loud passages. Turning on loudness normalization helps keep peaks under control. Files up to 100 MB are supported.
How to Use the Audio Volume Booster
- 1Choose an audio file (MP3, WAV or M4A), up to 100 MB.
- 2Drag the slider to set the volume — above 1× is louder, below is quieter.
- 3Optionally enable loudness normalization to tame peaks and even out levels.
- 4Click Adjust Volume, compare original vs adjusted, and download the result.
Frequently Asked Questions
Is my audio uploaded to a server?
No. The volume change is applied in your browser with FFmpeg WebAssembly. Your file never leaves your device — only the engine is downloaded, once.
Why is the first run slow?
The first time you use a converter here, the FFmpeg core (~30 MB) is downloaded from a CDN and compiled. It is then cached, so subsequent runs are much quicker.
How much can I boost the volume?
Up to 4× the original. Past about 2× on already-loud audio you may hear clipping distortion — enabling loudness normalization helps, but there is a physical limit to how loud audio can go before it distorts.
What does loudness normalization do?
It analyzes the whole file and adjusts levels toward a consistent perceived loudness, pulling up quiet parts and reining in peaks. It is useful for speech that swings between soft and loud.
Will boosting also make background noise louder?
Yes — a volume boost amplifies everything, hiss and hum included. If noise becomes distracting, run the file through our Audio Noise Reducer first, then boost.