Flip a recording so it plays backwards, then listen and download it as a WAV.
Original
Result
Digital audio is a long list of numbers (samples), tens of thousands per second for each channel. Reversing is exact: the last sample becomes the first and the first becomes the last, separately for the left and right channels, so stereo placement stays where it was. Nothing is re-encoded except the final step of writing a 16-bit WAV, so the reversed file has the same length, sample rate and quality as the decoded original.
Reversed sound has a distinctive character because natural sounds usually start sharply and fade away. Played backwards, a piano note swells up from silence and then stops abruptly, and reverb tails become "pre-echoes" that rise into each word. That is why reversed cymbals are a common transition effect in music, and why people reverse spoken phrases to check for hidden messages or just for fun.
Example: a 4.2-second clip at 48,000 Hz has 201,600 samples per channel. After reversing, sample 0 holds what used to be sample 201,599. With the palindrome option the result is 8.4 seconds long and sounds the same whether you play it forwards or backwards.
Does reversing lower the quality?
No. The samples are only put in the opposite order and saved as lossless 16-bit WAV, which is as good as or better than common source files such as MP3.
Can I reverse a song or a voice message?
Yes, any audio your browser can open: MP3, WAV, M4A/AAC, OGG and FLAC (whatever your browser can play). Only use recordings you have the right to edit.
Is there a size limit?
There is no hard limit, but the whole clip is held in memory. Up to about 30 minutes works well on a computer and up to about 10 minutes on a phone.
Can I reverse a video's sound?
Extract the audio first with our Extract Audio from Video tool, then open the WAV here.
Is my file uploaded?
No. The reversing happens in your browser and the new file is created on your device.