Audio Reverser

About Audio Reverser

This free online audio reverser tool lets you reverse any audio file to play it backwards. Also known as backmasking, this technique has been used in music production for creative effects, hidden messages, and experimental soundscapes. The tool works entirely in your browser using the Web Audio API, so your files stay private and secure.

What audio formats are supported?

All common audio formats are supported including MP3, WAV, OGG, AAC, M4A, FLAC, OPUS, and more. The tool can decode any format your browser supports.

What is audio reversal / backmasking?

Audio reversal (also called backmasking) is the process of reversing an audio signal so it plays backwards. This creates unique sound effects and has been used in music since the 1960s by artists like The Beatles, Led Zeppelin, and many others for creative and artistic purposes.

What can I use reversed audio for?

Reversed audio is used for: 1) Creating unique sound effects for music production, 2) Film and video sound design, 3) Checking for hidden messages in songs, 4) Creating ambient and experimental music, 5) Audio puzzles and games, 6) Reverse reverb effects (reverse the audio, add reverb, then reverse again), 7) Creating transitions and builds in electronic music.

How does the audio reverser work?

The tool uses the Web Audio API to decode your audio file into raw audio data (samples). It then reverses the order of all samples in each channel and re-encodes them into a new audio file. For stereo files, both left and right channels are reversed independently to maintain stereo imaging.

Will the audio quality be affected?

The reversal process itself doesn't degrade audio quality - it just reorders the samples. However, if you choose MP3 as the output format, some quality loss may occur due to MP3's lossy compression. For best quality, use WAV output which is lossless, or choose the highest MP3 quality setting (320 kbps).

What's the difference between WAV and MP3 output?

WAV is an uncompressed, lossless format that preserves perfect audio quality but creates larger files. MP3 is a compressed, lossy format that creates smaller files but with some quality loss. Use WAV for professional work or if you plan to edit further. Use MP3 for sharing, streaming, or when file size matters.

Can I reverse very long audio files?

Yes, the tool can handle audio files up to 100MB. However, very long files may take more time to process and require more memory. For extremely long files (hours of audio), consider splitting them into smaller segments first.

Does reversing audio reveal hidden messages?

While some artists have deliberately included reversed messages or sounds in their music (backmasking), most "hidden messages" people claim to hear in reversed audio are examples of pareidolia - the human tendency to perceive patterns (especially speech) in random noise. The tool will accurately reverse any audio, but what you hear is up to interpretation.

How do I create a reverse reverb effect?

Reverse reverb is a popular production technique: 1) Reverse your audio using this tool, 2) Add reverb to the reversed audio using an audio editor, 3) Reverse it again. The result is a reverb that builds up to the sound instead of trailing off, creating an ethereal, "sucking" effect often used in intros and transitions.

Can I reverse only part of an audio file?

This tool reverses the entire audio file. To reverse only a portion, first use an audio trimmer or editor to extract the section you want, reverse it with this tool, then rejoin it with the rest of your audio using an audio joiner.

Is my audio file safe and private?

Absolutely! All processing happens directly in your browser using the Web Audio API. Your audio file is never uploaded to any server. Everything stays completely private on your device. Once you close or refresh the page, all data is cleared from memory.

What famous songs use backmasking?

Many famous songs feature backmasking: The Beatles' "Rain" and "Revolution 9", Led Zeppelin's "Stairway to Heaven", Pink Floyd's "Empty Spaces", Electric Light Orchestra's "Fire on High", and many more. Some artists use it for artistic effect, while others include it as hidden Easter eggs for dedicated fans.