Reverse Audio
Play any song, voice note or sound effect backwards. Open an audio or video file, or record your voice, then listen to the original and the reversed version side by side and download a WAV.
- 1Open or record
- 2Listen and trim
- 3Download
1Open or record audio
or drop a file here · MP3, WAV, M4A, OGG, Opus, FLAC, or a video’s sound
Record voice asks your browser for permission to use the microphone. The recording stays on this device.
Reversed
Original
Your audio never leaves your device. It’s reversed in your browser. We count visits and finished downloads (tool name only) with analytics that sets no cookies.
2Trim (optional)
Keep only part of the reversed audio. Times are in seconds, counted from the start of the reversed version.
How to reverse audio
- Open a file or record. Press Choose audio, or drop a file on the box. Video files work too: the tool takes their sound. To reverse your own voice, press Record voice, allow the microphone, speak, then press Stop and reverse.
- Listen. The reversed version and the original each get a player and a waveform. Click a waveform to jump to that point.
- Trim if you like. Set a start and end time to keep just one part of the reversed audio. The shaded parts of the waveform are cut.
- Download. Press Download WAV. You get the reversed audio as a WAV file with the same number of channels as the original.
What you get
- Every sample in reverse order. The last sample of the sound becomes the first. Nothing else is changed: no speed change, no pitch shift, no effects.
- The same channels. Mono stays mono and stereo stays stereo, and the left and right channels are not swapped.
- The original sample rate, in most cases. The tool reads the sample rate from the file and decodes at that rate. The download panel shows the rate it used. When it can’t read the rate from the file, it uses 48,000 Hz and says so.
- WAV only, at a bit depth that keeps your sound. For 8-bit and 16-bit WAV files the download starts at 16-bit, which keeps every sample exactly. For everything else it starts at 32-bit float: 24-bit WAV and 32-bit float WAV are kept exactly, and MP3, M4A, OGG, FLAC and video soundtracks keep exactly what your browser decoded (decoders hand over 32-bit float samples). 32-bit integer and 64-bit float WAV are rounded to 32-bit float. You can switch to 16-bit for a smaller file that plays everywhere; for those deeper sources each sample is then rounded to 16 bits. A 16-bit stereo WAV at 44,100 Hz is about 10 MB per minute, and 32-bit float is twice that.
Long files
To reverse a sound, your browser has to hold all of it in memory, uncompressed, as 32-bit numbers. One minute of stereo audio at 48,000 Hz takes about 23 MB that way, so a one-hour file needs well over 1 GB. For files longer than 15 minutes the tool shows a warning first, with an estimate of the memory needed. Phones and older computers may run out of memory, close the tab, or fail to decode. If that happens, cut the file into shorter parts first.
FAQ
How can I reverse an audio file?
Open it on this page with Choose audio, or drop it on the box. It’s reversed right away. Listen to it in the Reversed player, then press Download WAV to save it.
How do I reverse my voice?
Press Record voice. Your browser asks for permission to use the microphone; allow it, say something, then press Stop and reverse. You hear your voice backwards in the Reversed player and can download it. Recording stops on its own after 10 minutes.
How do I do the reverse singing challenge?
Record a short line, a few words is plenty, and play the reversed version until you can copy it. Then press Reverse another, record yourself singing the backwards version, and listen to the new reversed result. If you copied it well, you hear something close to the original line.
Which formats work?
Anything your browser can decode. In our tests on a Mac, Chrome and Firefox opened MP3, WAV (16-bit, 24-bit and 6-channel), M4A (AAC), OGG Vorbis, Opus, FLAC, and the sound of MP4, MOV and WebM videos. Safari’s engine opened all of those except OGG Vorbis and .opus files. If a file won’t open, your browser can’t decode that format: try another browser, or convert the file to MP3 or WAV first.
Can I download an MP3?
No, the download is WAV only, and nearly every player, editor and phone can open it. The 32-bit float WAV keeps every sample exactly as reversed; the 16-bit WAV does too when the source is a 16-bit (or 8-bit) WAV. If you need an MP3, convert the WAV with an audio converter afterwards.
Is reversing audio the same as inverting it?
No. Reversing plays the sound backwards in time, which is what this tool does. Inverting usually means flipping the polarity (the waveform upside down), which sounds the same on its own and is used to cancel sound out. This tool doesn’t invert polarity.
Can you reverse audio on an iPhone?
Yes, in a browser. Open this page in Safari, tap Choose audio and pick a file from Files, or tap Record voice. We tested Safari’s engine on a Mac, not on a physical iPhone, so if a long file stalls on your phone, try a shorter clip.
Does this tool upload my audio?
No. Your file or recording is read, reversed and saved by your browser on your own device. It’s never sent to a server. You can check: open your browser’s developer tools, go to the Network tab, and reverse a file. No request carries it. The page counts visits and finished downloads (tool name only) with analytics that sets no cookies, and no file data is ever sent (see privacy).
Is it free? Is there a length limit?
It’s free, with no sign-up and no watermark or added sound. There’s no fixed length limit; the limit is your device’s memory. Files over 15 minutes get a warning first (see Long files).