Normalise Audio Volume
Bring an audio file to a standard loudness, so it doesn't need the volume riding up and down.
What it does
Normalise Audio Volume works on MP3, WAV, M4A, OGG, FLAC, AAC and OPUS with ffmpeg and audio engines compiled for the browser, so the recording or video is processed by your own computer or phone — the same programs a desktop editor uses, without installing one.
When you need it
Usually right before sending or publishing: a video too heavy for WhatsApp, a voice note full of hum, a clip that needs captions because the feed plays it muted, an interview to turn into text.
Limits and caveats
Long or high-resolution files take as long as your device needs, and a phone is slower than a laptop. The engines download once, the first time, and come from KIVO itself. The original file is never changed: you always download a new one. Everything happens in your browser, so the file never leaves your device.
How to normalise audio volume
- Drop or choose your MP3 file.
- KIVO processes it instantly — no waiting for uploads.
- Download the result. That's it.
Everything happens on this device: no file is uploaded and nothing leaves the browser.
Frequently asked questions
- Is this the same as turning the volume up?
- No, and the difference is the whole point. Turning the volume up scales everything, so a quiet recording with one loud cough stays quiet with a louder cough. This measures perceived loudness across the whole file and brings that to a target, which is what makes a podcast sit at a steady level.
- Which target should I use?
- −16 LUFS for a podcast, −14 for Spotify and YouTube, −23 for European broadcast. If you are unsure, −16 is the safe answer: platforms turn down what is too loud, and never turn up what is too quiet.
- Do my files get uploaded?
- No. This tool runs entirely in your browser, so the file never leaves your device.