LUFScale: Free Open-Source Loudness Normalization Tool by Perez Philippe
LUFScale is a free, open-source batch loudness analysis and normalization utility for Windows and macOS, released by developer Perez Philippe. It analyzes each audio file over its full duration, then physically adjusts perceived loudness toward a chosen LUFS target while controlling True Peak, re-measuring the output afterward to confirm the result rather than relying on metadata tags or a compatible player. You can download it directly from the developer site at lufscale.net/en with no sign-up required.
Key Features
- Batch processing of multiple audio files
- Full-duration loudness analysis per file
- Physical gain adjustment toward target LUFS
- True Peak limiting during normalization
- Post-process re-measurement for verification
- Open-source codebase (MIT license)
Supported Formats and Platforms
- Windows 10/11 (standalone executable)
- macOS 11+ (universal binary, Apple Silicon and Intel)
- Input: WAV, AIFF, FLAC, OGG, MP3
- Output: WAV (24-bit or 32-bit float)
- No DAW or plugin host required — runs as a standalone app
Licensing and Availability
LUFScale is released under the MIT license, making it free for both personal and commercial use. The source code is available on the project repository. There is no time limit, no registration, and no hidden paid tier — the current version is fully functional at no cost.
Bottom line: LUFScale delivers a transparent, verification-focused loudness normalization workflow as a free standalone application for Windows and macOS, ideal for mastering engineers, podcasters, and content creators who need batch LUFS compliance without a DAW.
FAQ
Is LUFScale really free for commercial use? Yes, it is released under the MIT license, which permits free commercial use, modification, and distribution.
What audio formats does LUFScale support? It accepts WAV, AIFF, FLAC, OGG, and MP3 as input and writes normalized output as 24-bit or 32-bit float WAV files.
Does LUFScale require a DAW or plugin host? No, it runs as a standalone application on Windows and macOS with no host software needed.