Reverse audio
Play an audio file backwards, start to end. Free, instant, and nothing is uploaded.
Drop an audio file here, or click to browse
MP3, WAV, M4A, OGG, or FLAC — up to 2GB
Up to 60 minutes long
An audio reverser that tells you what it's doing
One button, no settings
Drop a file, press Reverse audio, get it back playing end-to-start. There is nothing to configure and nothing to get wrong.
Same format in and out
MP3 stays MP3, WAV stays WAV — the format and codec you uploaded is the format and codec you download, just played backwards.
Honest about what it can handle
Your file's length is checked before the engine even loads, so an over-budget file is refused in a second rather than after a long run that ends in a crash.
Sample timing kept intact
Duration and pitch come out identical to the source — the order of the samples is the only thing that changes.
Plays right on the page
Listen to the reversed result in a built-in player before you download it, so you can check it sounds right first.
Your audio stays on your device
Everything runs locally through ffmpeg.wasm. No upload, no account, no watermark, no copy of your file left behind.
Backwards in three steps
- 1
Add an audio file
Drag an MP3, WAV, M4A, OGG, or FLAC file onto the page or click to browse. Keep it under 60 minutes — reversing holds the whole decoded file in memory at once.
- 2
Press Reverse audio
There is nothing to set. The file is flipped end-to-end with ffmpeg's areverse filter, in the same format and codec it arrived in.
- 3
Listen back, then download
The reversed file plays right on the page so you can check it before saving it. The whole thing ran in your browser — the file was never uploaded.
What people reverse audio for
Backwards audio is a production trick, a transition tool, and a novelty format all at once. Whichever one you're after, the file is flipped in your browser in seconds.
Reversed-vocal and backwards-instrument effects
A classic production trick — reverse a vocal take, guitar swell, or cymbal hit for an effect that's impossible to get any other way.
Whoosh and riser transition stingers
Reverse a forward sound effect to build a rising "whoosh-in" transition for a video edit, stream overlay, or podcast intro.
Backwards audio memes and clips
Turn a voice memo, song clip, or sound bite into the backwards-audio format that's been a recurring meme and novelty-content staple for years.
Listening for what forward playback hides
Audio engineers and QA listeners sometimes catch clicks, mouth noise, or artifacts more easily once familiar forward phrasing no longer masks them.
Frequently asked questions
Does this change my audio's format, or just its direction?
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Just its direction. The file is decoded, played back sample-by-sample in reverse, and re-encoded into the same format it started in — an MP3 comes back as MP3, a WAV comes back as WAV, and so on. Reversing is always a real re-encode (every sample comes out in a new order, so there is nothing to copy through untouched), but nothing about the container or codec changes on top of that.
Why is there a 60-minute limit on this audio reverser?
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Reversing can't be streamed: the last sample of your file is the first sample that has to be written, so ffmpeg decodes and buffers the whole thing before it can emit anything. Decoded audio is far cheaper to hold in memory than decoded video — even at a generous 48kHz/24-bit stereo rate it's under 0.3 MB per second — but the browser's WebAssembly heap still has a practical ceiling, so an hour-plus of decoded audio is where this tool draws the line rather than risk an out-of-memory crash mid-run on an unusually long file.
Why does the progress bar show elapsed seconds instead of a percentage?
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Because for most of the run there is no honest percentage to show. Nothing is written until the decode-and-buffer phase finishes, so ffmpeg's own counter reports zero the whole time. Rather than freeze a fake 0%, the bar pulses and counts seconds, then switches to a real percentage the moment reversed samples start being written.
Will reversing make my audio sound worse?
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For a lossless source (WAV, FLAC) there's no meaningful loss — reversing itself doesn't discard information. For a lossy source (MP3, M4A, OGG) the file goes through one extra generation of lossy re-encoding, the same as any other tool that has to touch every sample, which is a small, usually inaudible cost rather than a visible one.
Does reversing change the length or speed of my audio?
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No. Sample timing is preserved exactly, so the reversed file has the same duration and the same pitch as the original — this only changes which end plays first, not how fast anything plays.
What's reversed audio actually good for, besides novelty backwards sound?
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Musicians use it for reversed-vocal or reversed-cymbal effects and backwards-guitar parts; editors use it for whoosh/riser transition stingers built from a forward sound played in reverse; and it's a genuinely useful QA step for spotting mouth noise, clicks, or a hidden message that's easier to hear once the familiar forward phrasing is gone.
Does my audio get uploaded to a server?
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No. ffmpeg.wasm runs the whole reverse inside your browser tab. The work happens on your machine, not on a rented server, so there is no upload wait, no queue, and no copy of your file anywhere else.
Is there a video version of this?
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Yes — Reverse Video flips a video's picture and sound together in one pass. Use this page when you only have (or only care about) the audio track.
Play your audio backwards now
Free, instant, no account needed.