How to use
- Drop an audio file (MP3, WAV, M4A, and more) onto the box or click to choose one.
- Pick a target loudness in LUFS — -14 suits most streaming, -16 is a little quieter, and -23 matches broadcast.
- Click Normalize and wait while the loudness is adjusted and re-encoded as MP3.
- Download your normalized MP3 file.
Frequently asked questions
What does normalizing the volume do?
It evens out the loudness of your audio to a consistent target level so tracks are not too quiet or too loud. This is handy when combining clips from different sources or preparing audio for a platform with a specific loudness target.
What audio formats can I normalize?
You can drop in MP3, WAV, M4A and other common audio files — the tool accepts any standard audio format your browser recognizes. Whatever you feed in, the normalized result is always saved as a high-quality MP3.
What do the LUFS targets mean?
LUFS is a measure of perceived loudness. -14 LUFS is a common target for streaming services, -16 LUFS is slightly quieter, and -23 LUFS is the standard for broadcast. The tool uses the loudnorm filter with a true-peak limit of -1.5 dB.
How accurate is the result?
The tool uses a single-pass loudnorm, which is fast but approximate — the final loudness may land slightly off the exact target. For most listening it is more than close enough.
Are my files uploaded anywhere?
No. Everything runs locally in your browser. On the first run the tool downloads a one-time ~30MB processing engine (ffmpeg.wasm), then it works entirely offline and your audio never leaves your device.
Can it make quiet audio louder?
Yes. If your track is too quiet, normalizing to a higher target such as -14 LUFS raises it toward that level; if it is too loud, it is brought down instead. Either way the true-peak limit of -1.5 dB helps prevent harsh clipping.
About this tool
Free audio volume normalizer that runs 100% in your browser. Drop in an MP3, WAV or M4A, pick a target loudness (LUFS), and download an even, high-quality MP3 — no uploads.