Free Audio Reverser & Backmasking Tool
Reverse audio files to play backwards with sample-accurate PCM reflection.
- 100% free
- Files stay on your device
- No sign-up, no watermark
Choose files or drag & drop
Upload MP3, WAV, OGG, M4A, WEBM, FLAC, AAC files to convert locally inside your browser.
What is Audio Reverser & Backmasking Tool?
Create eerie reverse reverbs, backwards cymbal swells, and flipped speech effects. The audio buffer reverses sample array indexes chronologically, generating a pristine backwards sound file in milliseconds.
How to use Audio Reverser & Backmasking Tool
- 1
Add your file or input
Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
- 2
Adjust the options
Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
- 3
Process and download
Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.
Frequently asked questions
How does audio reversal work technically?
The sound file is decoded into floating-point PCM samples in memory. The array order is reversed from the final sample to the first sample and re-encoded into the output audio file.
Does reversing sound alter its audio quality or sample rate?
No. The sample rate, bit depth, and acoustic frequency spectrum remain identical; only chronological playback direction is inverted.
Can I reverse only a portion of an audio file?
Yes. You can trim a specific clip using the start and end markers first, then reverse just that segment.
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