Tool guide

Audio Normalization documentation

Audio Normalization adjusts the gain of an audio file so its highest peak reaches a selected target level. The tool analyzes the file, shows the current peak level, previews the waveform, and exports a normalized WAV file directly from the browser.

Open Audio Normalization Read quick start

Workflow overview

Normalize audio in four steps

The normalizer follows a simple analysis-and-export workflow: load a file, review the detected input peak, choose a target peak level, then export the adjusted audio as WAV.

1Upload audio

2Analyze peak

3Choose target

4Export WAV

Quick start

How to normalize a file

Open the Audio Normalization tool.
Click Choose an audio file and select a supported audio file.
Wait for the waveform and input level analysis to finish.
Review the Input Level, Target, and Duration boxes.
Select the target peak level: -1 dB, -3 dB, or -6 dB.
Click Normalize Audio.
Download the generated normalized WAV file.

Snapshot: upload widget

Choose an audio file MP3, WAV, OGG, M4A, FLAC, and other browser-supported audio formats. Browse Files

Analysis cards

Read the current level before exporting

After decoding the file, the tool scans every audio sample to find the loudest absolute peak. That value is shown as the Input Level in dBFS. The Target box shows the selected destination peak, and Duration confirms the decoded file length.

dBFS means decibels relative to full scale. In digital audio, 0 dBFS is the maximum possible sample level. Normalization targets are usually below 0 dB to leave headroom.

Snapshot: level summary cards

Input Level -8.4 dB

Target -1 dB

Duration 2:18

Waveform level preview

Use the waveform to understand level changes

The waveform preview shows the shape and relative amplitude of the decoded audio. It helps identify very quiet files, loud transients, silence, and uneven sections before applying gain.

Snapshot: waveform level preview

Peak amplitude

Target peak level

Choose how loud the normalized file should peak

Peak normalization multiplies the whole file by one gain value. If the loudest sample is currently -8.4 dBFS and the target is -1 dBFS, the tool raises the file by about +7.4 dB. If the input is already louder than the target, the gain is reduced instead.

Snapshot: normalization settings

Target Peak Level

-1 dB — loud peak-normalized audio

Peak normalization adjusts volume so the loudest sample reaches this level. Output Format

WAV

Exports the normalized result as a standard WAV file.

Target level guide

Pick the target based on how much headroom you want after normalization. Lower targets are safer when the file will be processed again later.

-1 dB Loud peak-normalized export. Useful when you want the file close to full scale while leaving a little safety margin.

-3 dB Safe headroom. Useful for files that may later be encoded, edited, or combined with other audio.

-6 dB Quieter export. Useful when you want extra headroom or a less aggressive level.

Supported input formats

The tool accepts audio files, but decoding depends on the browser. WAV and MP3 are usually the safest choices.

MP3 Commonly supported in modern browsers.

WAV Best-supported format for analysis and export.

OGG Supported by many modern browsers.

M4A Usually supported in Chrome, Edge, and Safari.

FLAC Browser support varies; Chrome and Edge are generally stronger here.

Normalize and download

Export the normalized WAV

When you click Normalize Audio, the tool calculates the required gain, applies that gain to every sample, and creates a WAV file. The download button appears below the main action button after processing completes.

Snapshot: normalize button and result

Normalized to -1.0 dB peak. Applied +7.4 dB gain. Output peak: -1.0 dB.

Download normalized WAV

Technical notes

How peak normalization works

Peak normalization finds the maximum absolute sample value across all channels, converts the selected target dB value to a linear amplitude, then applies one gain multiplier to the whole audio buffer. This preserves the file’s internal dynamics while changing its overall peak level.

Decode: the browser decodes the selected file with the Web Audio API.
Analyze: every channel is scanned for the highest absolute sample value.
Target: dB is converted to amplitude with 10 ** (dB / 20).
Gain: target amplitude is divided by current peak amplitude.
Apply: every sample is multiplied by the calculated gain and clamped to the safe range.
Export: the processed buffer is written as a PCM WAV file.

Peak normalization vs loudness normalization

This tool performs peak normalization, not LUFS loudness normalization. Peak normalization controls the highest sample value. Loudness normalization estimates perceived loudness over time. Two files normalized to the same peak can still sound different if their dynamics, compression, or average energy differ.

Troubleshooting

The Normalize Audio button is disabled Load a browser-supported audio file first. The button enables after decoding and peak analysis finish.

The file does not load The browser could not decode that file. Try WAV or MP3, or test in another modern browser.

The result sounds clipped Use a lower target such as -3 dB or -6 dB. Peak normalization avoids exceeding the target, but later playback chains or encoders can still add small changes.

The result is still not equally loud compared with another song Peak normalization matches the loudest sample, not perceived loudness. Two files with the same peak can still sound different.

The exported WAV is large WAV is uncompressed PCM audio, so it is larger than MP3, OGG, M4A, or FLAC.