MP3Gain analyzes and adjusts MP3 files so that they have the same volume.

We were hunting for a program to ensure all our MP3s were the same volume. We have amassed a collection since the 90s; some have really high volume, and some have really low volume. We did not need a complicated suite; we just wanted to do this one thing. Luckily, we asked on our MajorGeeks Facebook page and was pointed to MP3Gain. It does exactly what we need in an Open Source package. Simply drag and drop or add a folder, analyze it to see what the gains are, and set a default gain. You can use the default 89.0 volume, and you are good to go in minutes. Having never seen the program before, I think it would be easy for anyone to use. It’s not a tool you need every day, but when the time comes for you to normalize the volume on all your MP3s, this is the answer. Perfect!

It does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.

Also, the changes MP3Gain makes are completely lossless. There is no quality lost in the change because the program adjusts the MP3 file directly, without decoding and re-encoding.