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Audio Normalizer

Automatically normalize audio volume to target levels

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オーディオ正規化

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About Audio Normalizer

The 'Audio Normalizer' is a completely free, browser-based online audio normalization tool that automatically adjusts audio files with excessively quiet or loud volumes to your specified target level. It supports all common audio formats including MP3, WAV, M4A, and OGG. The tool features three normalization modes—'Peak Normalization,' 'RMS Normalization,' and 'LUFS Normalization'—enabling optimal volume adjustment tailored to your specific use case. Peak normalization adjusts the volume based on the peak amplitude of the audio waveform, making it ideal for preventing clipping (audio distortion) while maximizing dynamic range.

RMS normalization adjusts based on the overall average loudness (perceived volume) of the audio, commonly used for podcast distribution and YouTube video production. LUFS (Loudness Units Relative to Full Scale) normalization represents the latest industry standard using K-weighting frequency filtering to match human hearing perception. It's adopted by major streaming platforms: Spotify, YouTube, and Amazon Music use -14dB LUFS, while Apple Music uses -16dB LUFS, delivering consistent listening experiences across all services. For example, it instantly solves problems like 'multiple interview recordings have inconsistent volumes forcing listeners to constantly adjust their volume knob,' 'a recorded lecture is too quiet to understand clearly,' 'home-recorded narration needs to be elevated to professional broadcast quality,' or 'I need streaming-ready audio with unified loudness levels.' Built-in preset buttons for Spotify, YouTube, Podcasts, and Amazon Music let you apply the recommended platform-specific settings with a single click. All processing is completed entirely within your browser using the WebAudio API and JavaScript engine, meaning your audio files are never transmitted to any external server.

You can confidently normalize the volume of confidential meeting recordings or personal voice memos with absolutely zero risk of data leakage.

How to use Audio Normalizer

  1. Drag and drop the audio file (MP3, WAV, M4A, OGG, etc.) you want to adjust into the drop area in the center of the screen, or click to browse and select from your device.
  2. Select from 'Normalize Mode' and 'Presets.' For Spotify, YouTube, Podcasts, or Amazon Music, simply click the corresponding preset button to automatically apply the platform's recommended settings. For manual adjustment, choose 'Peak Normalize,' 'RMS Normalize,' or 'LUFS Normalize.'
  3. Use the 'Target Level' slider to set your desired output volume level in decibels (dB). When using presets, the target is set automatically. 0dB represents the maximum level, and lower values produce quieter output. The before/after level meters provide real-time visual preview of the normalization effect.
  4. Once your settings are configured, click the 'Normalize & Save' button. The volume-adjusted MP3 file will be automatically generated and downloaded to your device upon completion.

Benefits of Audio Normalizer

  • [Three Normalization Modes with Five Streaming Platform Presets] Equipped with Peak normalization (prevents clipping, preserves dynamics), RMS normalization (based on average loudness), and LUFS normalization (industry-standard streaming). Plus five one-click preset buttons for Spotify (-14 LUFS), YouTube (-14 LUFS), Apple Music (-16 LUFS), Amazon Music (-14 LUFS), and Podcasts (-14 LUFS) that automatically apply each platform's recommended settings without complex configuration. Perfect for multi-platform content distribution with unified loudness across all services.
  • [Real-Time Level Meters for Instant Visual Feedback] Compare the audio's peak and RMS levels before and after normalization with intuitive visual meters. Simply move the target level slider and watch the predicted post-normalization values update in real time. Preset applications are also previewed in real time for instant confirmation.
  • [100% Browser Processing for Maximum Security and Convenience] All audio data is processed exclusively within your device's browser—nothing is ever uploaded to external servers. No installation or registration required, so you can confidently normalize even confidential audio files while consuming zero network bandwidth.

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