Audio Normalizer
FFmpeg PoweredAuto-adjust loudness to standard level
Drag & drop files here, or click to select
Supports MP3, WAV, OGG, M4A, FLAC and other common formatsHow to Use
- Click the area above to select a file, or drag and drop a file onto the page
- Adjust parameters in the settings area
- Click the process button and download the result when ready
Frequently Asked Questions
How It Works
The Audio Normalizer uses FFmpeg WebAssembly with the loudnorm filter to automatically adjust audio loudness to the EBU R128 broadcast standard. This ensures consistent perceived volume across different audio files.
The normalization process uses two-pass measurement: Pass 1 analyzes the entire audio to measure integrated loudness (LUFS), loudness range (LRA), and true peak levels. Pass 2 applies gain adjustments to match the target loudness (-24 LUFS for EBU R128, or -14 LUFS for streaming platforms).
The loudnorm filter uses a psychoacoustic model that accounts for human perception of loudness, not just peak levels. It applies dynamic range compression to quiet sections and limiting to loud peaks, resulting in a consistent listening experience. The true peak limiter prevents inter-sample clipping that could cause distortion on playback.
Tips & Best Practices
- Use for batch consistency: Normalization is essential when processing multiple files that need consistent volume — podcasts, music albums, lecture series.
- EBU R128 vs streaming: EBU R128 (-24 LUFS) is for broadcast. Use -14 LUFS for Spotify/YouTube and -16 LUFS for podcasts.
- Normalize last: Apply normalization as the final step after all other audio processing (EQ, volume adjustment, effects).
- Two-pass is better: The tool uses two-pass processing for accurate measurement — don't skip this for critical applications.
- Check true peak: Ensure true peak stays below -1dBTP to prevent clipping on consumer playback devices.
- Don't over-normalize: Normalizing too aggressively reduces dynamic range, making audio sound flat and fatiguing.
Use Cases
Podcast networks normalizing episodes across different hosts and recording setups to ensure consistent listening experience for subscribers.
Music streaming services requiring -14 LUFS normalization for consistent playback volume between different artists and albums. Broadcast departments ensuring all content meets -24 LUFS EBU R128 compliance before air. Audiobook producers maintaining consistent volume across chapters recorded in different sessions. Conference organizers normalizing recordings from different speakers with varying microphone setups. Film post-production ensuring dialogue tracks meet broadcast loudness standards before final mix.