Audio Loudness Report (LUFS)

Audio Loudness Report (LUFS) | Online Free Tool | Elysia Tools

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
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

1Upload an audio file in a supported format such as MP3, WAV, or FLAC.
2The tool runs FFmpeg's loudnorm filter to analyze the audio.
3It extracts integrated loudness, true peak, and LRA values from the analysis.
4Outputs 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.

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.

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Inputs

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Podcast Loudness Check for Streaming

2. Music Mastering Dynamic Range Analysis

FAQ

Copyright-Free FLAC Audio Samples

Copyright-Free MP3 Audio Samples

Copyright-Free WAV Audio Samples

Copyright-Free Raw PCM Audio Samples

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