Audio Normalizer
Normalize audio loudness to any target LUFS level — Spotify (−14 LUFS), YouTube (−16 LUFS), EBU R128 broadcast (−23 LUFS), podcast (−18 LUFS), and more. Upload your audio file, choose a preset, and download the normalized WAV instantly. All processing happens locally in your browser with no signup required.
Upload an audio file, choose a target loudness level, and download the normalized result as a WAV file — all processed locally in your browser with no uploads.
Drop your audio file here
or click to browse · MP3, WAV, M4A, OGG, FLAC supported
Normalization Settings
Platform loudness standard
Prevents over-amplification
Prevents clipping after gain
Why Use Our Audio Normalizer?
Instant Audio Normalization
Our audio normalizer processes your file entirely in your browser using the Web Audio API — no upload, no wait. Normalize audio loudness to any target LUFS level in seconds, regardless of the original file's volume.
Secure & Private — No Upload
Your audio files never leave your device. The audio normalizer processes everything locally using client-side JavaScript and the Web Audio API, guaranteeing complete privacy for your music, podcasts, and voice recordings.
Platform-Specific LUFS Presets
Choose from built-in loudness presets for Spotify (−14 LUFS), YouTube (−16 LUFS), EBU R128 broadcast (−23 LUFS), podcasts (−18 LUFS), and more. The audio normalizer also supports custom LUFS targets for any workflow.
100% Free — No Limits
Normalize unlimited audio files with no signup, no subscription, and no usage caps. The audio normalizer is completely free forever — no ads, no premium tier, no file size restrictions. Just upload and normalize.
Common Use Cases for Audio Normalizer
Music Distribution & Streaming
Normalize your tracks to −14 LUFS before uploading to Spotify, Apple Music, or Tidal. Streaming platforms automatically turn down louder tracks, so normalizing with our audio normalizer ensures your music sounds its best at the platform's target level.
Podcast Production
Normalize podcast episodes to −18 LUFS for consistent loudness across all episodes. Use the audio normalizer to fix quiet recordings, balance interview guests with different microphone levels, and meet podcast platform standards.
YouTube & Video Content
Normalize audio to −16 LUFS before uploading to YouTube to prevent the platform from applying its own loudness normalization. The audio normalizer ensures your video's audio sounds exactly as intended to viewers.
Broadcast & Post-Production
Normalize dialogue, music beds, and sound effects to EBU R128 (−23 LUFS) or ATSC A/85 (−24 LUFS) broadcast standards. The audio normalizer's peak limiter prevents clipping during the gain adjustment process.
Batch Audio Consistency
Normalize multiple audio files to the same loudness level for consistent playback in playlists, audiobooks, e-learning courses, and game audio assets. The audio normalizer processes each file to your exact target LUFS.
Voice Recording Cleanup
Fix quiet voice recordings from phone calls, interviews, or home studios by normalizing them to a comfortable listening level. The audio normalizer boosts the gain while the peak limiter prevents distortion on loud passages.
Understanding Audio Normalization
What is Audio Normalization?
Audio normalization is the process of adjusting the overall loudness of an audio file to a target level, measured in LUFS (Loudness Units relative to Full Scale). Unlike simple peak normalization — which only raises the loudest moment to 0 dBFS — integrated loudness normalization measures the perceived loudness of the entire file and applies a consistent gain adjustment. Our free audio normalizer online uses the Web Audio API to measure RMS-based loudness and apply precise gain to reach your target LUFS level. This is the same approach used by streaming platforms like Spotify, YouTube, and Apple Music to ensure consistent playback volume across all tracks.
How Our Audio Normalizer Works
- Upload Your Audio File: Drop or select any audio file — MP3, WAV, M4A, OGG, FLAC, or any format your browser supports. The file is decoded locally using the Web Audio API; no data is sent to any server.
- Configure & Normalize: Choose a target LUFS preset (Spotify, YouTube, broadcast, podcast) or enter a custom value. Set the maximum gain limit and enable peak limiting to prevent clipping. Click Normalize Audio to process.
- Review & Download: The audio normalizer displays before/after loudness meters, applied gain, and peak levels. Download the normalized file as a lossless WAV — ready for upload to any platform.
What the Audio Normalizer Measures
- Integrated Loudness (LUFS): The average perceived loudness of the entire file, measured across all channels. This is the primary metric used by streaming platforms for loudness normalization.
- Applied Gain (dB): The exact gain in decibels applied to reach the target LUFS. Positive values boost quiet audio; negative values would reduce loud audio (though the tool focuses on boosting).
- True Peak (dBFS): The maximum sample amplitude before and after normalization. The peak limiter ensures the output never exceeds −1 dBTP to prevent inter-sample clipping during encoding.
- WAV Output: The normalized file is exported as 16-bit PCM WAV — a lossless format that preserves all audio quality and is accepted by every DAW, streaming platform, and video editor.
Privacy and Data Security
The audio normalizer processes all audio entirely in your web browser using the Web Audio API and JavaScript. No audio data, file contents, or metadata are transmitted to any external server at any point. Your audio files never leave your device, making this tool completely safe for unreleased music, confidential recordings, and proprietary audio content.
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Frequently Asked Questions — Audio Normalizer
An audio normalizer is a tool that adjusts the overall loudness of an audio file to a target level measured in LUFS (Loudness Units relative to Full Scale). Our browser-based audio normalizer measures the integrated loudness of your file and applies a precise gain adjustment to reach your target — no server upload required.
LUFS (Loudness Units relative to Full Scale) is the standard unit for measuring perceived audio loudness. Streaming platforms like Spotify (−14 LUFS), YouTube (−16 LUFS), and broadcast standards like EBU R128 (−23 LUFS) use LUFS targets to ensure consistent playback volume. Normalizing your audio to the correct LUFS prevents platforms from automatically turning your audio down or up.
The audio normalizer supports any audio format your browser can decode natively — this includes MP3, WAV, M4A (AAC), OGG, FLAC, and WebM audio. The output is always a 16-bit PCM WAV file, which is lossless and universally compatible.
Peak limiting prevents the normalized audio from exceeding −1 dBTP (decibels True Peak), which avoids inter-sample clipping when the file is encoded to MP3 or AAC. You should always enable peak limiting when normalizing audio for streaming or broadcast. Disable it only if you need the maximum possible gain without any ceiling.
The maximum gain setting caps how much the audio normalizer will boost a quiet file. The default is 30 dB, which is sufficient for most recordings. If your file is extremely quiet (e.g., a very distant recording), you can increase this. Setting it too high on very quiet files may amplify background noise significantly.
Yes. The audio normalizer processes all audio entirely in your browser using the Web Audio API. No audio data, file contents, or metadata are ever transmitted to any server. Your files never leave your device, making this tool completely safe for unreleased music, confidential recordings, and proprietary audio.
WAV (PCM) is a lossless format that preserves all audio quality after normalization. Re-encoding to MP3 or AAC in the browser would require additional libraries and could introduce quality loss. You can convert the normalized WAV to MP3 or any other format using a DAW or audio converter after downloading.
There is no artificial file size limit. The practical limit depends on your device's available RAM, since the entire audio file is decoded into memory. Most modern browsers can handle audio files up to 200MB or more. For very large files, close other browser tabs to free up memory.
Yes. The audio normalizer is 100% free with no signup, email verification, subscription, or payment required. There are no premium features, file size limits, or usage caps — everything is available to everyone for free, forever.