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Upload an audio file and reverse it instantly in your browser — no upload to a server, no software to install.
Drag and drop an audio file here, or click to browse
MP3, WAV, M4A, OGG, FLAC, AAC, Opus, or WebM — up to 100MB
This free online tool reverses any audio file so it plays backwards, entirely inside your browser. Decoding, reversing, and encoding all happen on your device — your audio is never uploaded to a server.
Is this audio reverser really free?
Yes, completely free with no sign-up, watermarks, or usage limits.
What audio formats are supported?
You can upload MP3, WAV, M4A, OGG, FLAC, AAC, Opus, or WebM files up to 100MB.
Does the audio get uploaded anywhere?
No. Everything happens locally in your browser using the Web Audio API — your file never leaves your device.
Can I reverse it back to the original?
Yes — reversing a reversed WAV file restores the original sample order exactly, since the process is lossless. Reversing an MP3 twice will also restore the order, though MP3 compression itself is lossy.
How large a file can I upload?
Files up to 100MB are supported, which covers most songs, podcasts, and voice recordings.
Why do reversed recordings sound so strange?
Reversing audio flips each sound's natural attack and decay, so words become unintelligible and instruments take on an eerie, swelling quality — it's the same effect used in famous "backmasked" recordings.
All audio processing happens directly in your browser. Your files are never uploaded to any server.