https://www.nch.com.au/switch/normalize.html
Download software to normalize audio levels of mp3, wav etc. Normalize volume of a single audio file or batch normalize an entire music library at once. PC/Mac.
normalize audiobatchfileswav
https://www.video2edit.com/normalize-audio
Use this online tool to normalize audio tracks in a video. Create normalized audio with this video editor.
normalize audiotracknormalization