Normalize audio and boost volume
Make a quiet recording, song or ringtone louder — safely. Normalize finds the loudest peak and raises everything until that peak sits just below 0 dBFS.
Drop an audio or video file here
MP3, M4A, WAV, OGG, FLAC, MP4, MOV… — processed on your device, never uploaded
How it works
Peak normalization measures the single loudest sample in your selection and applies one gain change to the whole clip so that peak lands at −1 dBFS. It never clips, and because the same gain applies everywhere, the balance between quiet and loud parts is unchanged.
If you need it louder still, untick Normalize and use the Volume slider (up to +12 dB). When the result would clip, the tool warns you before you export. Clipping flattens the tops of the waveform and sounds harsh, so it is usually better to accept a slightly quieter file.
The −1 dB headroom is deliberate: MP3 and AAC encoders can create peaks slightly above the original when they reconstruct the waveform, and a little headroom keeps the encoded file from distorting on phones.
Recommended settings
- Normalize = loudest peak to −1 dBFS
- Volume +6 dB doubles the amplitude
- Watch for the clipping warning
- Normalize after trimming, so silence and spikes outside the selection don’t count
Step by step
- Open your audio. Click Open file or drop an MP3, M4A, WAV, OGG, FLAC or video file onto the page. It is decoded in your browser and never uploaded.
- Select the part to keep. Drag across the waveform, drag the handles, or type exact start and end times. Use Find loudest part or a length preset such as 30 s for ringtones.
- Add fades and set the volume. Set fade in and fade out lengths, then tick Normalize or adjust Volume. Press Play to preview exactly what will be exported.
- Download. Choose MP3, WAV, M4A or M4R, type a name and click Download.
FAQ
What does normalizing audio do?
It raises (or lowers) the whole clip by the same amount so its loudest peak reaches a target level, here −1 dBFS. Quiet audio gets louder without distortion.
Why isn’t my audio louder after normalizing?
One loud spike — a cough, a clap, a plosive — sets the peak. Trim it out of the selection, or use the Volume slider and accept a little clipping on that spike.
Is normalizing the same as compression?
No. Normalizing applies one fixed gain. A compressor reduces the difference between loud and quiet parts, which makes audio sound louder overall.
Are my files uploaded?
No. Audio is decoded, edited and encoded in your browser with the Web Audio API, WebCodecs and a JavaScript MP3 encoder. Nothing is sent to a server, so it also works on slow connections once the page has loaded.
Which formats can I open?
Anything your browser can decode: MP3, WAV, M4A/AAC, OGG Vorbis, Opus and FLAC, plus the audio track of MP4, MOV and WebM videos. Chrome and Edge support the widest range.