Noise Destroyer is a simple app that allows you to pick an audio or video file and get rid of background noise with just a few taps. Its simple, and powered by a state of the art noise removal engine so your audio is crisp and clean without any background sounds. (It works on pretty much everything but removing background conversation. Other than that it should take care of most background noises!).
Terms and Conditions: https://www.noisedestroyer.com/webapp/#/terms