Reverse Audio

Reversing audio flips the entire waveform in time: the last sample becomes the first and the first becomes the last, so the sound plays from end to beginning. A word spoken forward becomes an unfamiliar backward sound; a drum hit's sharp attack and fading tail swap places, turning a percussive hit into a swelling crescendo that ends abruptly.

This tool uses FFmpeg's areverse filter, which loads the decoded audio and rewrites it sample-by-sample in reverse order. Because it operates on the raw audio after decoding, it works identically regardless of the input format, and the output is a clean MP3 with no added artifacts beyond ordinary MP3 encoding.

Reversing is exactly reversible: reverse a file twice and you get back the original audio, which is the whole basis of the reverse-singing challenge.

One of the most useful production techniques built on reversed audio is reverse reverb. The recipe: take a sound (often a vocal phrase, snare, or cymbal), add a long reverb tail, reverse the whole thing, and place it so the swelling reversed tail leads into the original, un-reversed sound. The result is a smooth build that 'sucks' into the downbeat — heard on countless pop, electronic, and cinematic tracks.

You can also reverse a cymbal crash on its own to make a riser, or reverse a sustained pad to create an ethereal intro. Reverse the element here, then import it into your DAW to line it up with the beat. Because this tool outputs standard MP3, it drops straight into any editor or DAW timeline.

Reversed speech has a long cultural history — from claimed 'hidden messages' in reversed rock records (backmasking) to the modern reverse-singing challenge, where players sing a reversed melody and reverse their attempt to see how closely it matches the original.

To play: record a short clip, reverse it here, practice imitating the strange reversed sounds, record your imitation, then reverse that recording. The closer your reversed imitation is to the original clip, the better you did. Since reversing twice returns the original, this tool is all you need for both steps — reverse the target, and later reverse your attempt.

Many online audio reversers upload your file to a server, process it there, and send it back — meaning your recording passes through someone else's computer. This tool does not. FFmpeg compiled to WebAssembly runs the reverse operation entirely in your browser's memory, on your own device.

Nothing is uploaded, no account is required, and after the page finishes loading you can even disconnect from the internet and the reverser still works — proof there is no server in the loop. That makes it safe for private voice recordings, unreleased music, and client work.