Audacity is free noise reduction software for Windows, Mac, and Linux operating systems. The software lets you upload or record audio and then edit it: add fade-in and fade-out, change speed and tempo, normalize the sound, reduce echo, and make the sound cleaner. The app’s interface may look a bit confusing for a beginner, but there are many tutorials online that will explain every aspect of the software in detail.
The main advantages of Audacity are that it’s free and has plenty of audio-editing features. However, there are a few difficulties you can face. First of all, you may need to install additional software to make the app open your files. The most common requirements are FFmpeg and Lame. While opening a file in Audacity, watch out for error messages – they should point out the software you need to install. Another disadvantage is that even though you can import videos into the program, you cannot export them back as videos. So, you’ll have to get a video editor to combine the new audio with the video file and erase the old audio track. Which means, again, installing additional software.
Two options in Audacity remove background noise. The first one is via the Noise Reduction tool. It’s the easier one because it requires less settings tweaking. It’s best for reducing continuous noise like street sounds and a fan turned on. In the video below, you’ll see how to get rid of background noise in Audacity using this tool.