Audio Normalizer Normalize audio volume to a consistent level automatically.

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Audio Normalizer

Normalize audio volume to a consistent level automatically.

Upload Audio

Drop your audio file or click to browse.

Normalize

Click Normalize to adjust the volume to your target peak level.

Download

Download your normalized audio file.

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What Is Audio Normalizer?

The Audio Normalizer automatically adjusts audio volume to a consistent, optimal level. It analyzes the peak or RMS level of your audio and applies the right amount of gain to reach a target loudness without clipping. This is essential for making quiet recordings louder, ensuring consistent volume across multiple files, or preparing audio for broadcast standards. The tool supports peak normalization (maximizing the loudest sample to 0 dB) and can analyze the full audio to determine the optimal gain. All processing uses the Web Audio API locally in your browser.

Why Use Audio Normalizer?

Automatic volume optimization — no manual adjustment needed
Peak normalization maximizes volume without clipping
Analyze before/after levels with visual meters
Completely browser-based and private

Common Use Cases

Podcast Production

Normalize episodes to consistent loudness across your catalog.

Music Mastering

Maximize track volume to competitive loudness levels.

Voice Recording

Boost quiet voice recordings to clear, audible levels.

Batch Consistency

Ensure multiple audio files have matching volume levels.

Technical Guide

Peak normalization works by scanning all samples in the AudioBuffer to find the absolute maximum amplitude. The required gain is calculated as targetPeak / currentPeak (where targetPeak is typically 1.0 for 0 dBFS). This gain is then applied uniformly to all samples via a GainNode in an OfflineAudioContext. The tool also computes RMS (Root Mean Square) levels by taking the square root of the mean of squared samples across a windowed analysis. For loudness normalization, the tool calculates an approximation of perceived loudness and adjusts gain to reach the target level. Visual meters display peak and RMS levels before and after processing. The output is encoded as a 16-bit PCM WAV file with the processed audio.

Tips & Best Practices

1
Peak normalization is safest — it guarantees no clipping will occur
2
If audio has brief loud spikes, consider using the compressor first, then normalizing
3
For podcasts, normalize to -1 dB peak to leave headroom for encoding
4
Normalization cannot fix heavily distorted or clipped audio

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Frequently Asked Questions

Q What is audio normalization?

Normalization adjusts the overall volume of an audio file so that the loudest point reaches a target level (typically 0 dB or -1 dB).

Q Will normalization distort the audio?

No. Peak normalization applies uniform gain that is calculated to prevent clipping, so no distortion occurs.

Q Is normalization the same as compression?

No. Normalization applies uniform gain to the entire file. Compression dynamically reduces loud parts, changing the dynamic range.

Q Can I normalize multiple files to the same level?

Process each file individually — they will all be normalized to the same target peak level.

Q Is processing done locally?

Yes. All normalization happens in your browser. No files are uploaded.

About This Tool

Audio Normalizer is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.