Play an audio file backwards - for sound design, creative effects or the classic backmasking puzzle. Locally, no upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A reversed cymbal swell, an inverted vocal cue, or the legendary "play it backwards" over a suspicious lyric line - audio reversal is a staple of sound design, music production and, not least, urban legends about hidden messages in songs. This tool reverses the playback direction of a whole audio file.
Technically this differs from every other edit in this catalog: instead of processing the decoded audio samples piece by piece as they arrive, the ENTIRE track must sit fully in memory before the sample order can be reversed - reversal cannot be streamed "on the fly". That is why the same honest length cap as the other audio tools applies here, only the memory budget is actually used in full for it.
With multi-channel material, channel assignment is preserved - only the time axis reverses, not left and right. Processing runs entirely locally in the browser.
| Input formats | MP3, WAV, M4A, AAC, OGG, OPUS, FLAC |
|---|---|
| Auto-conversion | MP4 |
| Output formats | WAV, M4A |
| Batch processing | No |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: The whole file must sit fully decoded in memory (no streaming processing possible) - so the honest per-device length cap (desktop about 20 minutes, tablet 15, phone 10) applies especially strictly here. Compressed inputs need the browser WebCodecs decoder. Only the playback direction changes - pitch and tempo stay untouched.
No, everything runs locally in the browser.
No, only the sample order reverses - pitch and tempo stay the same.
Because the whole file must sit in memory before reversing - unlike streamable effects.
Yes, mathematically exact - reversing is a pure ordering operation with no information loss.
Mono to stereo · Split audio · Audio speed · Create a spectrogram · Find the BPM · Find the key