Lossless Audio Checker

WebApp PRO Version

Lossless Audio Checker is a utility to check whether a FLAC or WAVE file is truly lossless or not, by detecting cutoff frequencies. It can show you the full frequency range for each file.

Nowadays, the process of audio mastering sometimes upconverts, upsamples and upscales songs, resulting in CDs and so-called "lossless" tracks that are in fact, incomplete. Lossless Audio Checker helps you identify these tracks.

Our goal is to raise awareness on these bad practices from the music industry and pressure them to deliver true lossless music. Help us by testing your music and reporting your results — it's free!

HTML5 & JavaScript

Lossless Audio Checker WebApp
Chrome/Firefox

Download Lossless Audio Checker
Windows XP SP3 (with .NET Framework 2.0)/Vista/7/8 · Version 1.9.1

Download LAC CLI: Windows · Mac · Linux
Version 1.9.1

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