The following is a list of free audio and music editors available online. It is by no means exhaustive! I will add to it as I come across new things (or at least things that are new to me). And I’ll try to delete anything that gets out of date.
Downloadable Free Audio Players and Editors
Audacity
Audacity is a free audio and music editor which is open-source and easy to use. It can also be used to record live audio too. Audacity can convert tapes and records (remember them??) to computer or CD. It can also edit sound files; for example, you can cut, copy, splice or mix sounds together, or split recordings into separate tracks. It also allows you to add effects – for example changing the speed or pitch of a recording. It and has been used to record and mix entire albums. You can even use it to create ringtones!! It is available for Windows, Mac and Linux.
Ocenaudio
Ocenaudio is designed “for people who need to edit and analyse audio files without complications”. As such, it is a lovely, free, fast, easy-to-use audio editor for Windows, although it lacks some advanced features. With Ocenaudio you can even select multiple parts of a track and apply the same effect to them all. Effects include silence (!), fades, removing background noise and changing pitch.
Wavepad
Wavepad is a free audio and music editor for Windows and Mac that is extremely simple to use. You can record and edit music, voice and other audio recordings. When editing, you can cut, copy and paste parts of recordings, then add effects (e.g. echo, amplification or noise reduction.) WavePad supports WAV and MP3 files, plus other formats (including VOX, GSM, WMA, real audio, AU, AIF, FLAC, OGG and more.)
Ashampoo Music Studio
Ashampoo Music Studio is a free audio editor for Windows. It has an easy-to-use interface, so it’s good for beginners working with simple (single track) audio clips. It can be used to convert files to different audio formats, as well as rip and burn CDs.
Dolby On
A free audio recorder and sound editor for voice, music and video available for both Android and iOS. You can even record in other apps and import the file into Dolby On to edit and enhance your recording. Can easily share your creations on social channels, send to collaborators, export lossless audio, or even livestream to Facebook.
AIMP
AIMP is an audio player that supports most audio formats. You can customise the interface, and includes features such as bookmarking.
Free Online Audio and Music Editors
AudioTrimmer
If you just want to trim an audio clip, head to AudioTrimmer. It’s easy to use, supports a variety of audio formats and is mobile friendly.
AudioMass
AudioMass is useful for more advanced audio edits. It is free and open-source. You can edit clips and apply effects (such as reverb, noise reduction, changing speed, removing silences etc).
Audiotool
Audiotool can be used in Chrome or Firefox running on Windows, Mac or Linux. You can use the music you create with Audiotool commercially, as long as you have the permission of any contributors and you know the origin of any samples used.
Vocal Remove
Upload an MP3 file and use Vocal Remove to erase the singer’s voice, leaving just the music. You can use the volume slider to edit the music file, as occasionally some of the music is accidentally erased along with the vocals. You can then download only the vocals, only the music or both.
Online Audio Equaliser
With Online Audio Equaliser you can boost or reduce specific frequencies of any audio file. It is free to use – you don’t even have to register or subscribe to use it. Supports a wide variety of file types. And when you’re done adjusting, you can save your results in popular formats as mp3, m4a, m4r, flac, or wav.
Sodaphonic
Sodaphonic is a simple, intuitive tool that is clean and easy to use on any device. You can easily record, edit and share audio online. It doesn’t require a sign-in or account creation for basic use. And it’s FREE! Yay!
Free Audio Converter
fre:ac
fre:ac is a free audio converter and CD ripper with support for most popular formats and encoders. It converts easily between MP3, M4A/AAC, FLAC, WMA, Opus, Ogg Vorbis, Speex, Monkey’s Audio (APE), WavPack, WAV and other formats. To convert a file, simply drag your files into the fre:ac window, select your required output format, then click on the Play button. Fre:ac is also available as a Windows app at the Microsoft Store (but only works on Windows 10).
https://www.freac.org/downloads-mainmenu-33
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Note: please read the disclaimer before downloading / using any software.