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Audio Loudness Normalize (LUFS)

· Last updated：2025-12-05

Normalize audio to a target loudness (LUFS) using FFmpeg loudnorm

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Written by the Elysia Tools team
Audio312
FFmpeg47

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file, number, select
Output type
file
Sample coverage
4
API ready
Yes

Overview

This tool normalizes audio files to a target loudness level measured in LUFS (Loudness Units Full Scale) using FFmpeg's loudnorm filter. It ensures consistent volume across tracks, making it ideal for podcasts, videos, and music that require standardized audio levels.

When to use

  • When audio files have inconsistent loudness and need standardization for a uniform listening experience.
  • For preparing content to meet broadcasting or streaming loudness standards like EBU R128.
  • When mixing audio from multiple sources, such as interviews or background music, to achieve balanced playback.

How it works

  1. 1Upload an audio file in a supported format, such as MP3, WAV, or AAC.
  2. 2Set the target integrated loudness (LUFS), true peak (dBTP), and loudness range (LRA) using the provided options.
  3. 3Select the desired output format from choices like MP3, AAC, or FLAC.
  4. 4Download the normalized audio file, which will have the specified loudness characteristics.

Use cases

  • Podcast production to ensure all episodes have similar loudness levels for better listener engagement.
  • Video editing to normalize dialogue and background music, meeting broadcast standards for platforms like YouTube or TV.
  • Music mastering to achieve consistent playback volume across different devices and streaming services.

Examples

1. Normalize Podcast Episodes

Podcast Producer

Background

A podcast producer has recorded multiple episodes with varying microphone setups, resulting in inconsistent audio levels.

Problem

Listeners report that some episodes are too quiet while others are too loud, affecting the overall experience.

How to use

Upload the podcast audio file, set the target integrated loudness to -16 LUFS for standard podcast levels, and choose MP3 as the output format.

targetI: -16, targetTP: -1.5, targetLRA: 11, outputFormat: mp3

Outcome

All episodes are normalized to -16 LUFS, providing a consistent volume for seamless listening.

2. Standardize Video Audio for Broadcast

Background

A video editor is compiling clips from interviews, music, and sound effects, each with different loudness levels.

Problem

The final video has uneven audio, making it unsuitable for broadcast where loudness standards must be met.

How to use

Upload the mixed audio track, adjust the target loudness to -23 LUFS to comply with EBU R128, and export as WAV for high quality.

FAQ

What is LUFS and why is it used?

LUFS stands for Loudness Units Full Scale, a standard for measuring audio loudness. It is used to ensure consistent volume levels across different audio tracks and platforms.

Can I normalize audio without losing quality?

Yes, the tool uses FFmpeg's loudnorm filter to adjust loudness while preserving audio quality, especially when outputting to lossless formats like FLAC or WAV.

What audio formats are supported for input and output?

The tool accepts various audio formats for input and outputs in MP3, AAC, M4A, OGG, Opus, FLAC, or WAV, depending on your selection.

How do I set the target loudness values?

You can specify the target integrated loudness (default -16 LUFS), true peak (default -1.5 dBTP), and loudness range (default 11) using the numeric inputs provided.

Is there a limit on file size or duration?

Yes, the audio file must be under 200 MB. There is no specific duration limit, but larger files may take longer to process.

Hub

Audio Loudness, Dynamics, and Mastering Delivery

Measure LUFS, true peak, and dynamics, apply suitable control, and verify podcast, broadcast, or music audio before delivery.

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