Reverse Audio
Reverse any audio clip — right in your browser, nothing uploaded.
Drag & drop your audio files here, or click to choose. Everything runs in your browser — nothing is uploaded.
Reversing audio plays a clip backwards, a trick used for backmasking effects, sound design, music production, checking songs for “hidden” reversed messages, or simply undoing an already-reversed file. This free Reverse Audio tool does it entirely inside your browser using a WebAssembly build of FFmpeg, so your audio is never uploaded to any server. Drop in one file or several — MP3, WAV, OGG, M4A, FLAC and more — and each is reversed automatically and handed back in the same format where possible. Preview each result in place, then download it. Free, no signup, no watermark, nothing to install.
Frequently Asked Questions
How do I reverse an audio file?
To reverse audio, drag your files onto the drop area or click to choose them, and each clip is played backwards and re-encoded automatically the moment it is added — there is nothing to configure. When a file finishes it appears as a row with a "-reversed" filename, its size, an inline player so you can hear it backwards, and a Download button. You can reverse several files at once, all inside your browser.
Is the Reverse Audio tool free and private?
Yes, it is completely free with no signup, no watermark and nothing to install, and it is private because reversing runs on a WebAssembly build of FFmpeg inside your own browser, so your audio never leaves your device. That keeps private or unreleased recordings safe. The only download is the converter itself, a one-time roughly 32 MB file that your browser caches afterwards.
What format is the reversed file?
The reversed file keeps the same format as the one you upload where possible, so a reversed MP3 comes back as an MP3 and a reversed WAV as a WAV; unusual inputs fall back to MP3. Because reversing requires re-encoding, a lossy input such as MP3 loses a tiny bit of quality, while a lossless input such as WAV or FLAC stays lossless.
What is reversing audio used for?
Reversing audio is used for creative and practical effects: backmasking and reversed-vocal effects in music, sound design and video editing, checking a song for so-called hidden reversed messages, making prank or novelty clips, and restoring a clip that was already reversed by reversing it again. It is a common step in music production and audio experimentation.
Is there a file size limit?
There is no fixed size limit because nothing is uploaded; the only real limit is your device’s memory, and you can reverse several files at once with each listed separately. Reversing has to hold the whole clip in memory to flip it, so very long recordings of several hundred megabytes work more comfortably on a desktop browser than on a phone.
Does it work on iPhone, Mac and Android?
Yes, it runs in any modern browser on Windows, Mac, Linux, iPhone and Android, with nothing to install and no account needed, so you can reverse audio on a laptop or straight from your phone. The first use downloads a one-time converter of about 32 MB, which your browser then caches so later reversals start instantly.