Free tool
Reverse Audio Online
Pick an audio file, hear it backwards, and download the reversed version. It runs in your browser, so the file never leaves your computer or phone.
MP3, WAV, M4A, AAC and other formats your browser can play, up to 10 minutes. The file is reversed on this device and never uploaded.
How it works
Your browser decodes the file into raw sound samples, then flips their order, so the last moment plays first. Words come out as a new language: the last sound of each word comes first, vowels stretch, and an s at the end turns into a hiss at the start.
The download is a WAV file at the original sample rate, so it opens in any audio app, GarageBand included.
Want to record and reverse on iPhone?
Revoo records your voice, a song or a laugh and plays it backwards the moment you stop, with no file to export. It also runs the Reverse Singing Challenge: copy a backwards line, flip your copy and hear how close you got. Recording and reversing are free and unlimited, with no ads.
