Reverse audio
Drop a file and get it backwards: the whole track, or only the part you select on the waveform while the rest plays as before. Save it in the same format or as MP3, WAV, M4A, Opus or FLAC. Nothing leaves your device.
Updated October 30, 2026
Options
How it works
- Drop an audio file, or a video, anywhere on this page.
- It is reversed at once; to turn only a part around, tick Reverse only a part and select it on the waveform.
- Listen to the result and download it.
What people reverse, and why
Video editors reverse a cymbal or a riser to make a sound that builds up before a cut; musicians reverse a guitar take or a reverb tail for an effect; teachers and curious listeners reverse a recording to hear what is hidden in it; and some people just want a voice memo backwards for a joke. The whole file is reversed the moment you drop it, and you can listen before downloading. Everything is decoded and encoded on your device.
Reversing only a section
Tick Reverse only a part and drag across the waveform, or type the start and end in seconds. The rest of the track plays as before and only the selection runs backwards, with a tiny fade at each edge so the joins do not click. Zoom in on the waveform with the plus button or a pinch to land on the exact beat, and use Start at cursor and End at cursor while playing to place the edges by ear.
Formats and batches
Keep the format of the file, or choose MP3 to play anywhere, WAV or FLAC to keep every sample, M4A or Opus for small files; M4A needs a browser with an AAC encoder, which Firefox lacks. Up to 20 files of up to 2 GB each can be reversed in one run with the same settings. Drop a video and you get its sound reversed as an audio file; the picture is not included.
Why people use it
Free, no account
Every tool is free, with no sign-up, no e-mail address and no limit on how often you use it.
Your files stay on your device
The browser opens the file and processes it in memory, on your device. Nothing is uploaded, so nothing can be kept, leaked or looked at.
No watermark
The result is yours as it is: no watermark, no branding, no trial version.
Any device
A phone, a tablet or a computer with a current browser is enough: no app to install, no software to update.
Works offline after the first visit
The browser keeps the pages and their engines, so a tool you have opened once keeps working without a connection.
Open-source engines
The code that does the work is open-source software, named on the Licences page, running as WebAssembly in your browser.
Why it is private
Everything you type or drop here is handled by your browser, on your device. Nothing is uploaded. To verify, open your browser's developer tools, go to the Network tab, and use the tool: you will see no request carrying your data.
While a file is being processed, the counter under the result shows the page's network traffic: 0 requests and 0 B for your data.
How to check it yourself, step by step
What you can check yourself
Open your browser's developer tools on the Network tab before you drop a file: while the tool works you will see no request carrying your data, and the counter under every result shows the page's own measurement.
The site sets no cookies, so there is no cookie banner. Anonymous usage counts and error reports without file names are the only things that leave the page, as the privacy policy describes.
Every change goes through thousands of automated tests in three browser engines, including a guard that fails a test if a single byte of a file leaves the page.
Frequently asked questions
- Does reversing lower the quality?
- Reversing itself is exact: every sample is kept, in the opposite order. Saving it as MP3, AAC or Opus is a new lossy encode (at the source's bitrate when the format stays the same); choose WAV or FLAC to keep every sample.
- Can I reverse only one part?
- Yes. Tick Reverse only a part and select it on the waveform, or type the start and end. Only that part plays backwards; a 3 ms dip at each edge hides the click where it meets the rest.
- Can I reverse the sound of a video?
- Yes: drop an MP4, MOV, WebM or MKV and you get its audio track backwards as an audio file; the picture is left out.
- How long can the file be?
- To be turned around, the audio is decoded into memory, about 21 MB per minute of stereo. A computer handles about an hour and a half, a phone around five minutes; the tool says so before it starts when a file is too long for the device.
- Is my file uploaded?
- No. It is decoded, reversed and encoded in your browser; the network meter under the result stays at 0 B.
- Can I reverse audio on my phone?
- Yes, in the browser. A phone decodes about five minutes of stereo into memory; longer files need a computer, and the tool says so before starting.
- Can I reverse a WhatsApp voice note?
- Yes. Save the note as a file (it is usually Opus in an OGG container), drop it here and choose MP3 or keep the format. Most browsers decode Opus.
- Which format should I save in?
- MP3 if it has to play anywhere, WAV or FLAC if it goes into an editor and must stay lossless. Keeping the file's own format re-encodes at the source's bitrate.
- Can I reverse the video too, not just the sound?
- No. This tool outputs audio only. To play a clip backwards with its picture, use a video tool such as Video to GIF, which has a Reverse option, or a video editor.
- Does the result have the same length?
- Yes, exactly. Every sample is kept and played in the opposite order; only the container and the encoding may change the file size slightly.
Install it as an app
Chrome, Edge and Android browsers offer to install this site from the address bar or the menu; on iPhone use Share, then Add to Home Screen. It opens like an app, keeps working offline and still processes everything on your device.