Audio Reverser Guide
Record, reverse, compare, and save audio in your browser.
Quick audio reversal
Open Reverse Audio. Choose an audio file, drop it into the input area, or press Record your voice. If you have no file ready, tap a sample: it loads and plays backwards, and you can compare the original.
Choose a mono or stereo file up to 25 MB and 5 minutes. Common WAV and MP3 files are good starting points. Other formats depend on your browser decoder. A recording stops at 60 seconds; press Stop sooner when your phrase is finished.
Select a short section
After loading, Start and End default to the full clip. Enter seconds to isolate a phrase or sound effect. The end must follow the start and stay within the recording. The selected section is used for both playback directions and download. Use full clip restores the range.
The waveform shows the loaded audio's amplitude. Reversal changes time order in each channel; it does not swap stereo left and right. Switch between Play original and Play reversed to compare. Only one preview plays at once.
Download
Download reversed WAV saves the current selection as 16-bit PCM WAV at original speed. It does not export MP3. A WAV can be larger than a compressed input and does not restore details already lost to compression. The source file is not changed.
The reverse singing challenge
On Reverse Singing, record or import an original phrase in the left panel. A clear 5–10 seconds works well. Press Listen backwards and try the practice speeds or loop option. Slow playback lowers pitch as well as speed.
Wear headphones and stop the playback before recording an imitation in the right panel. You can also import an imitation. Both takes have a 60-second limit. Press Reveal my attempt to reverse the second take, then compare with Original. Save reveal WAV keeps the result at normal speed. Try again, keep original clears only the imitation; Start over clears both.
The example uses synthetic sounds to demonstrate the flow. It is not a live recording or a score. The challenge compares by ear.
Microphone or playback not working?
- Use a recent browser on HTTPS. Local development also works on localhost.
- Allow microphone access for the site and check the selected device in browser settings. If access is denied, import a local recording instead.
- A missing or busy microphone can prevent recording. Close another application using the input and retry.
- Press a playback button yourself, check volume, and make sure audio is not routed to a disconnected device.
- If a file is empty, damaged, too long, too large, or uses an unsupported codec, the tool explains the problem. Try a short mono or stereo WAV.
Audio stays in browser memory. There is no recovery after a take is cleared. Read the Privacy Policy for the difference between audio processing and website requests.