How to use
- Drop an audio file (MP3, WAV, M4A, OGG and more) onto the box or click to choose one from your device.
- Click Reverse and wait while the waveform is flipped end to end and re-encoded as an MP3.
- Watch the progress percentage while the reverse audio is processed entirely in your browser.
- Download your reversed MP3 file, ready to play backwards or share.
Frequently asked questions
What audio formats can I reverse?
You can reverse common audio formats including MP3, WAV, M4A, OGG and others. Drop in any audio file and the tool flips it and saves the result as an MP3.
What does reversing the audio actually do?
It plays the audio backwards: the last moment becomes the first and the first becomes the last. The entire waveform is flipped end to end using ffmpeg's areverse filter.
Are my files uploaded anywhere?
No. Everything happens locally in your browser. Your audio is never sent to a server, and the reversed MP3 is saved straight to your device.
Does the engine really run in my browser?
Yes. On the first run the tool downloads a one-time ~30MB processing engine (ffmpeg.wasm). After that it works entirely offline and your audio never leaves your device.
What quality is the reversed MP3?
The reversed audio is re-encoded to a high-quality MP3 using the libmp3lame encoder at quality level 2, which keeps the sound clear and detailed.
Is there a file size or length limit?
There is no fixed limit, but because everything runs in your browser, very large or very long files use more memory and take longer. For big files, a desktop browser works best.
About this tool
Free online audio reverser that plays any MP3, WAV, M4A or OGG backwards and saves it as MP3. Runs 100% in your browser with ffmpeg.wasm — nothing is uploaded.