Normalize Audio Online
Adjust audio loudness to a consistent -14 LUFS (Spotify/YouTube standard). Makes quiet audio louder and loud audio quieter for uniform volume across all your tracks. Free, private, and entirely browser-based. Your files never leave your device.
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Supports MP3, WAV, OGG, AAC, M4A, FLAC - up to 500 MB
Tips for audio normalization
Industry-standard loudness
-14 LUFS is the standard used by Spotify, YouTube, and most podcast platforms for consistent playback volume.
Two-pass accuracy
FFmpeg's loudnorm filter measures your audio first, then applies precise normalization for accurate results.
All formats supported
Works with MP3, WAV, OGG, AAC, M4A, and FLAC. Output preserves the original audio format.
Adjustable target
Set your target between -24 and -9 LUFS. Podcasters often prefer -16 LUFS, while broadcast may use -23 LUFS.
Privacy first
All normalization happens in your browser using WebAssembly. Your audio files are never uploaded anywhere.
How to normalize audio loudness online
Audio normalization adjusts the overall loudness of a recording so that it plays at a consistent volume. This is especially useful when mixing tracks from different sources — some recordings may be naturally quiet while others are already loud. Normalization brings everything to your target level.
The tool uses FFmpeg WebAssembly with the loudnorm filter, which is the industry standard for loudness measurement. It performs a two-pass analysis: first measuring the current loudness (Integrated LUFS), true peak level, and loudness range, then applying gain adjustments to reach your target LUFS with precision.
The default target of -14 LUFS matches the standards used by Spotify, YouTube, and most podcast platforms. You can adjust the target from -24 LUFS (quieter, broadcast standard) to -9 LUFS (very loud). All processing happens locally in your browser — your audio files are never uploaded to any server.
Frequently asked questions
What is LUFS and why does it matter?
LUFS (Loudness Units Full Scale) measures perceived loudness. Unlike dB which measures absolute volume, LUFS accounts for how human ears perceive sound. Streaming platforms normalize to -14 LUFS so all tracks play at consistent volumes.
How does audio normalization work?
It analyzes your audio's current loudness, then applies gain adjustment to reach your target LUFS. Quiet parts get louder, loud parts get quieter, resulting in consistent perceived loudness throughout.
Is my audio uploaded to a server?
No. All normalization happens locally in your browser using WebAssembly (FFmpeg.wasm). Your files never leave your device.
What audio formats are supported?
The normalizer supports MP3, WAV, OGG, AAC, M4A, and FLAC input and output. The output format matches the input format.
What's the difference between -14 LUFS and -16 LUFS?
-14 LUFS is the Spotify/YouTube standard. -16 LUFS is slightly quieter and preferred by some podcast platforms. -23 LUFS is the EBU R128 broadcast standard. Choose based on your target platform.