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Reversed audio has a long history, from psychedelic guitar solos and backmasked messages to the reverse-cymbal swell that leads into a chorus. Flip a whole recording end to end, or select one word or bar and reverse only that, then compare it with the original.
Processing locally on your device
Overview
Reversing is one of the simplest audio operations. Once a file is decoded with the Web Audio API, each channel is an array of sample values, and reversing it means reading that array from the last value to the first. The tool does exactly that on a copy of the audio, keeping its sample rate and channel layout. Nothing is filtered or resampled, so the reversed audio is as clean as the source, and reversing twice gives back the original exactly.
What changes is the shape of every sound over time. Most natural sounds have a fast attack and a slower decay: a piano note starts sharply and rings out. Reversed, the note swells from silence and cuts off abruptly, and reverb tails turn into rising pre-echoes. That is why reversed audio sounds otherworldly, and why producers reverse a cymbal crash or a reverb tail to build tension into the next section of a song.
Choose Whole file, or Selection only to drag across the waveform (or type From and To times) and flip just that part while everything around it keeps playing forward. The waveform always shows the result, so you can see the reversed section. Play reversed and Play original let you switch between the two. Save as WAV instantly, or as MP3, M4A, FLAC, OGG or Opus through FFmpeg running in your browser (a one-time download of about 31 MB).
Open an audio file or a video.
Choose Whole file, or Selection only and drag across the part to flip.
Click Play reversed, and Play original to compare.
Pick an output format and click Save reversed audio.
Use cases
Reverse a crash cymbal or a sustained reverb tail to create a swell that leads into a drop or chorus, then line its abrupt end up with the downbeat.
Record a phrase, reverse it and challenge friends to sing it backwards, then reverse their attempt to hear how close it sounds.
Reversed footsteps, voices or ambient textures make eerie atmospheres for games, films and horror podcasts.
Select a short passage of a song and flip just that part to check for a hidden backwards message, without reversing the whole track.
Pro tips
Answers to common questions about the audio reverser.
No. The samples are simply put in the opposite order; nothing is filtered or resampled. Quality loss only happens if you then save to a lossy format such as MP3, and at 192 kbps it is very hard to hear.
Yes. Choose Selection only, then drag across the waveform or type the From and To times. Only that range is flipped; the rest of the file plays forward as before.
Most sounds start loud and fade out. Reversed, the fade comes first and the sharp start comes last, so you hear a gradual swell that ends suddenly.
Backmasking is the technique of recording a sound or message backwards onto a track so it is only intelligible when played in reverse. It was popularized by rock records in the 1960s and 1970s.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The audio reverser is free to use with no sign-up, no watermarks and no daily limits.