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Audio Loudness Report (LUFS)

Generate a report on the loudness (LUFS) and dynamic range

Runs FFmpeg loudnorm analysis to report integrated loudness, true peak, and LRA.

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

Key Facts

Category
Media
Input Types
file
Output Type
json
Sample Coverage
4
API Ready
Yes

Overview

This tool generates a detailed loudness report for audio files using FFmpeg's loudnorm analysis. It measures integrated loudness in LUFS, true peak levels, and loudness range (LRA) to help assess compliance with audio standards.

When to Use

  • •When you need to verify audio loudness against broadcast standards like EBU R128 or streaming platform guidelines.
  • •When preparing audio for distribution to ensure consistent volume levels across episodes or tracks.
  • •When analyzing the dynamic range of recordings during mixing or mastering for quality control.

How It Works

  • •Upload an audio file in a supported format such as MP3, WAV, or FLAC.
  • •The tool runs FFmpeg's loudnorm filter to analyze the audio.
  • •It extracts integrated loudness, true peak, and LRA values from the analysis.
  • •Outputs a JSON report containing these loudness metrics for review.

Use Cases

Broadcast engineers checking audio files for TV or radio compliance with loudness regulations.
Podcast producers ensuring episodes meet platform-specific loudness recommendations like those from Spotify or Apple Podcasts.
Audio engineers analyzing dynamic range during post-production to optimize track mastering.

Examples

1. Podcast Loudness Check for Streaming

Podcast Producer
Background
A podcast producer is finalizing an episode and needs to confirm it meets Spotify's loudness guidelines to avoid listener complaints about volume jumps.
Problem
The episode audio has inconsistent loudness, and manual verification is inefficient.
How to Use
Upload the episode's MP3 file to the tool.
Outcome
The report shows integrated loudness of -16 LUFS, within Spotify's range, and true peak at -1 dBTP, indicating no clipping issues.

2. Music Mastering Dynamic Range Analysis

Audio Engineer
Background
An audio engineer is mastering a rock album and wants to assess the dynamic range of each track before distribution.
Problem
Need to measure LRA to ensure tracks have appropriate dynamics for the genre without over-compression.
How to Use
Upload the WAV file of a mastered track.
Outcome
The report indicates an LRA of 10 LU, suggesting good dynamic variation suitable for rock music.

Try with Samples

audio, file
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
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Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
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Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
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Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
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FAQ

What audio formats are supported?

The tool supports common audio formats like MP3, WAV, FLAC, and others compatible with FFmpeg.

What does LUFS stand for?

LUFS means Loudness Units Full Scale, a standard measure of perceived loudness used in broadcasting.

Can this tool normalize or adjust audio loudness?

No, this tool only reports loudness metrics; it does not modify the audio file.

How accurate is the loudness measurement?

It uses FFmpeg's loudnorm filter, which implements industry-standard algorithms for precise loudness analysis.

Is there a file size limit for uploads?

Yes, the audio file must be under 200 MB, as specified in the tool options.

API Documentation

Request Endpoint

POST /en/api/tools/audio-loudness-report

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -

File type parameters need to be uploaded first via POST /upload/audio-loudness-report to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
JSON Data: JSON Data

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-loudness-report": {
      "name": "audio-loudness-report",
      "description": "Generate a report on the loudness (LUFS) and dynamic range",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-loudness-report",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]