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Private browser utility / Social & Creator

Free Audio Normalizer

Runs entirely in your browser - no upload, no sign-up.

Live workspaceLocal processing
Choose audio to set its peak level automatically

Your source and normalized audio stay in this browser tab. The audio is never uploaded.

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audio normalizer / browser utility
01 / Overview

What is an audio normalizer?

An audio normalizer measures the loudest sample in a recording, then applies one constant gain so that peak reaches a chosen target. Use this free audio normalizer to select -1, -3, or -6 dBFS, preview the result, and download a WAV without uploading your source.

02

How to use

  1. 01
    Choose your audio

    Drop an MP3, WAV, M4A, FLAC, OGG, AAC, or another common audio file into the tool.

  2. 02
    Set the target peak

    Use -1 dBFS for modest headroom, or select -3 or -6 dBFS when a later editing step needs more space.

  3. 03
    Normalize locally

    Start normalization. The browser measures the complete track, calculates the required gain, and creates a WAV.

  4. 04
    Preview and download

    Compare the original with the normalized result, then download the new WAV to your device.

03

Who it's for

  • Podcasters and interviewers can raise a quiet recording to a predictable peak before editing or transcription.
  • Musicians and sound designers can prepare demos, samples, and effects with consistent digital headroom.
  • Video editors can set a voice or music clip to a safe peak before adding it to a larger mix.
  • Students and teachers can improve the level of lectures, pronunciation clips, and presentation audio without installing an editor.

This tool performs two local passes with WebAssembly FFmpeg. The first measures sample peak across the complete audio stream. The second applies the exact gain difference between that measurement and your target, then exports an uncompressed 16-bit WAV.

Peak normalization preserves the balance between quiet and loud moments because every sample receives the same gain. It is different from LUFS loudness normalization, compression, and limiting. One short click or transient can determine the gain for the entire file.

FAQ

Is my audio uploaded?

No. File selection, peak analysis, gain processing, preview, and the output stay in your browser tab. The first run downloads the FFmpeg engine code, but your recording is not sent with that request. Closing or refreshing the tab releases its temporary local file URLs.

Is this audio normalizer free?

Yes. You can normalize and download audio without an account, subscription, credit limit, or watermark. The practical limits are your browser's available memory and processing speed. Compressed recordings expand during processing, and the uncompressed WAV result may be larger than the source.

What file size limits apply?

The conservative cap adapts to the device: 100 MB on mobile or lower-memory hardware, 250 MB on typical desktops, and 500 MB on high-memory desktops. Long compressed files can require several times their stored size while decoded, so smaller files are more reliable in a browser.

What target peak should I choose?

A -1 dBFS target is a useful general starting point because it leaves a small margin below digital full scale. Choose -3 or -6 dBFS when the file will be mixed, encoded, or processed again and you want more headroom. Delivery requirements can differ.

Is peak normalization the same as LUFS loudness normalization?

No. Peak normalization follows the highest sample and applies one constant gain. LUFS estimates perceived loudness over time with frequency weighting and gating. Two tracks with the same sample peak can still sound very different, so use a LUFS workflow when perceived level matching is the goal.

Can normalization fix clipped or uneven audio?

No. Normalization cannot reconstruct peaks already flattened by clipping, and it does not reduce the difference between quiet and loud passages. Repairing clipping needs restoration tools; controlling changing levels needs automation, compression, or limiting before a final normalization pass.

Which audio formats can I use?

The tool accepts common files including MP3, WAV, M4A, AAC, FLAC, OGG, Opus, AIFF, WebM audio, AC3, and WMA. Browser preview support varies by codec, but the local FFmpeg engine may still read a source that the built-in audio player cannot preview.

Does normalization change speed, pitch, or dynamics?

No. The tool applies the same gain to every sample, so timing, pitch, and the relative level differences within the track remain unchanged. It exports an uncompressed 16-bit WAV to avoid another lossy compression pass, though the source decoder and bit-depth conversion still determine the final precision.