Reverse an audio file
Turn a sound file around so it plays from the end to the start. Done on this device; your files are not uploaded.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Plays an audio file backwards, from MP3, WAV, M4A, FLAC or OGG, and saves it in the same or another format. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after your first run to save itself for offline use, and then it works offline.
Done
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Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
How it works
- Drop one or more sound files (MP3, WAV, M4A, FLAC, OGG), or tap to pick them.
- Keep the original format, or choose WAV or FLAC to keep every sample, or MP3, M4A or OGG for a smaller file.
- Press Reverse. Each file downloads when it is ready, with -reversed added to its name; several come as a zip.
In your browser, not on a server
Your browser decodes the sound with its own audio decoders into plain samples in your tab. Each channel is then copied from its last sample to its first, so left and right stay in step. The file is written again in your tab: MP3 by LAME in WebAssembly, WAV and FLAC by code in this site (at the original sample rate), M4A and OGG by the browser’s own encoders.
Compared with upload-based tools: Online audio reversers upload the recording, cap the length, and keep the file for a while. Here the reversing happens on your device and nothing leaves it.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Are my files uploaded?
No. Your browser decodes the sound with its own decoders, the samples are put in the opposite order in the page, and the new file is written in your tab. Your files are not uploaded, so the limit is your device’s memory (phones hold less), and the page works offline after your first run.
Is the reversed WAV exact?
Yes. WAV and FLAC output keep the sample rate of the original and every sample, only in the opposite order. MP3, M4A and OGG have to be encoded again, which discards a little detail, so choose WAV or FLAC if you plan to edit the result further.
Does it work on stereo files?
Yes. Left and right are reversed together, so the stereo picture stays in step. Files with more than two channels are mixed down to stereo first.
Can I reverse the sound of a video?
Drop the video on Reverse video, which flips the picture and, if you want, the sound together.
More video and audio tools
Remove background noise
Keep the voice, lose the hiss, hum and fan noise. Cleaned on this device, never uploaded.
Merge audio
Combine songs, voice notes or podcast segments into one file. Done on this device, never uploaded.
Mic test
Check that your microphone works before a Zoom, Teams or Discord call: speak and watch the level, then play back five seconds to hear how you sound. Nothing is uploaded.
Webcam test
Check that your webcam works before a Zoom, Teams or interview call: see the live picture, the real resolution and the measured frame rate. Nothing is uploaded.