
Audacity is a free desktop audio editor, and reversing a clip in it takes about three clicks. Here is the exact path, plus a quicker option for when you are away from your computer.
That is the whole process. Reverse is one of Audacity's built-in effects, so there is nothing extra to install.
If you are on a phone, Reverse Audio does the same job in one tap: import or record a clip, hear it backwards, and share. It also reverses an MP3 and lets you add voice effects, which Audacity needs plugins for.
Import the file, select the audio with Command-A or Control-A, then choose Effect and Reverse. Export when you are done.
Yes. Reverse is one of Audacity's standard built-in effects, so you do not need to install anything extra.
Yes. Reverse Audio reverses a recording or imported file in one tap on iOS and Android, no desktop needed.