BYTETOOLS

Audio Normalizer

Normalize audio loudness online for free to broadcast and streaming standards (EBU R128 / LUFS). Runs fully in your browser — files are never uploaded.

Drop an audio file here or click to browseLoudness is measured and corrected locally — nothing is uploaded.

What is the Audio Normalizer?

The Audio Normalizer brings your recording to a consistent, industry-standard loudness. Pick a target — −14 LUFS for streaming platforms, −16 LUFS for podcasts, or −23 LUFS for EBU R128 broadcast — and the tool measures and adjusts your audio with ffmpeg's loudnorm filter, keeping true peaks below −1.

  • EBU R128 loudness normalization (ffmpeg loudnorm)
  • Presets for −14 LUFS streaming, −16 LUFS podcast, −23 LUFS broadcast
  • True-peak limited to −1.5 dBTP to prevent clipping
  • Dynamic mode evens out levels within the recording
  • 100% local — audio is never uploaded
  • Built-in preview player before download

How to use the Audio Normalizer

  1. 1

    Drop an audio file onto the box or click to browse.

  2. 2

    Choose a loudness target (streaming, podcast or broadcast) or the dynamic mode.

  3. 3

    Click Normalize Audio and wait for processing to finish.

  4. 4

    Preview the result and download the normalized MP3.

About the Audio Normalizer

The Audio Normalizer brings your recording to a consistent, industry-standard loudness. Pick a target — −14 LUFS for streaming platforms, −16 LUFS for podcasts, or −23 LUFS for EBU R128 broadcast — and the tool measures and adjusts your audio with ffmpeg's loudnorm filter, keeping true peaks below −1.5 dBTP to avoid clipping.

It is built for podcasters whose episodes vary in level, musicians preparing uploads, and anyone whose recordings come out too quiet or inconsistently loud. A dynamic mode is also included, which continuously evens out quiet and loud passages within the same file rather than applying one overall correction.

Everything runs 100% locally in your browser using WebAssembly ffmpeg — no uploads, no server, no account. Even long podcast episodes are processed on your own device.

Frequently asked questions

What does LUFS mean?

LUFS (Loudness Units relative to Full Scale) measures perceived loudness rather than raw signal peaks. Streaming services and broadcasters use it to keep playback consistent — for example Spotify normalizes to about −14 LUFS and EBU broadcast standards target −23 LUFS.

Which target should I choose?

Use −14 LUFS for music going to streaming platforms, −16 LUFS for podcasts and spoken word (the common recommendation for stereo podcasts), and −23 LUFS if you are delivering to European broadcast specifications. When unsure, −16 LUFS is a safe, comfortable level for voice.

What is the difference between normalization and compression?

Loudness normalization applies one measured gain adjustment so the whole file hits a target level, preserving the original dynamics. Compression continuously changes the gain, making quiet parts louder and loud parts quieter. The dynamic mode here behaves more like gentle automatic compression.

Will normalizing cause clipping or distortion?

No. The loudnorm filter limits true peaks to −1.5 dBTP as part of the process, which is the headroom streaming services recommend so that lossy encoding does not push peaks into distortion.

Is my audio uploaded to a server?

No. Measurement and normalization run entirely in your browser using WebAssembly. Your recordings never leave your device.

Related tools