To understand a true "full" sound normalizer, you must know the difference between the two main types of normalization:

Using a portable normalizer is straightforward. Follow these steps to optimize your audio library:

Which do you need the portable software to run on? Share public link

Standard normalization might cause "inter-sample peaks" that distort when converted to MP3. A Full portable normalizer includes a True Peak limiter (usually set to -1dBTP) to ensure your audio never clips after conversion.