SoundGeek
Free offline audio cleanup for Windows - noise, hum and levels
...On a typical run it lifts the voice tens of decibels further above the background, removes 50 Hz mains hum and levels the file to a loudness target you set.
Three strengths. Two of them are ordinary filtering and need nothing downloaded at all. Only the strongest uses a trained model, and that model is half a megabyte.
The cleaned copy is written beside the file it came from. Your original is only ever read.
No account, no adverts, no per minute charge. Free and open source under GPL-3.0. Windows 10 or 11, 64 bit.