Audio Loudness Normalizer
Normalize audio loudness online for free to Spotify -14, podcast -16 or EBU R128 -23 LUFS via Web Audio offline rendering, with preview and WAV download - no upload.
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What is Audio Loudness Normalizer?
The Audio Loudness Normalizer measures the loudness of your audio and applies gain to hit a target LUFS level directly in your browser: -14 for streaming platforms like Spotify, -16 for podcasts or -23 for broadcast. The gain is applied through Web Audio offline rendering and the result can be previewed and downloaded as a WAV file.
Key Benefits
- Match loudness between episodes, tracks and clips
- Hit platform targets like Spotify’s -14 LUFS
- Avoid uploading confidential or unfinished audio
- Preview the normalized result before downloading
- Private and instant - everything runs in the browser
Common Use Cases
- •Matching loudness between podcast episodes
- •Preparing music tracks for streaming platforms
- •Leveling voice recordings from different sessions
- •Normalizing clips before video editing
How to Normalize Audio Loudness
- Choose the audio: Select an MP3, WAV, OGG or M4A file from your device.
- Pick the target: Choose -14 LUFS for streaming, -16 for podcasts or -23 for broadcast.
- Normalize: Press Normalize to measure the file and apply the exact gain needed.
- Preview and download: Listen to the normalized result and download it as a WAV file.
Key Features
- Streaming, podcast and broadcast LUFS presets
- RMS-based loudness measurement per file
- Gain applied through Web Audio offline rendering
- In-page preview of the normalized audio
- WAV export playable anywhere
- No upload - audio stays on your machine
Frequently Asked Questions
What do the LUFS targets mean?
LUFS measures perceived loudness. Streaming platforms normalize to around -14 LUFS, podcasts are commonly -16, and broadcast follows EBU R128 at -23. Picking the right target keeps your audio at platform-typical loudness.
How is the loudness measured?
The tool estimates loudness from the RMS level of the whole file and converts it to a LUFS-style value. It skips the full ITU-R BS.1770 K-weighting, so treat it as a close practical approximation.
Will normalizing make quiet audio louder without distortion?
Gain is applied digitally, so moderate boosts are clean. Very large boosts can clip peaks; if that happens, normalize to a slightly lower target or compress the audio first.
Is my audio uploaded anywhere?
No. Measurement and rendering use the Web Audio API locally in your browser, and the WAV export is created on your machine.