Reverse Audio Online – Play Any Song Backwards

Play audio backwards or reverse only a selected region, smooth the edges, preview the result, and export locally in five audio formats.

This tool plays a file's samples backward — either the entire clip in one pass, or just a region you set by start and end time while leaving everything outside it untouched. A short crossfade is blended in at the edges of whatever you reverse, so the moment where forward audio meets backward audio doesn't produce an audible click or pop.

How to reverse audio

  1. Drop a WAV, MP3, FLAC, M4A/AAC or Ogg file onto the page, or click 'Choose audio file'.
  2. Keep 'Whole file' to flip the entire track, or pick 'Selected region' and type the start and end seconds of the part to play backwards.
  3. Set Edge smoothing (0–50 ms) — raise it if the join between forward and backward audio clicks.
  4. Choose an output format, click 'Reverse entire audio' (or 'Reverse … region'), compare the Original and Reversed players, then download.

Two reverse modes

'Whole file' is the default: every sample from start to end is mirrored, turning the entire clip into its own reverse playback. Switching to 'Selected region' instead lets you type a start and end time in seconds, to the hundredth of a second, and the waveform highlights the span you've chosen — only the samples inside that window are reversed in place, and the audio before and after it plays exactly as it did in the source file. This is genuinely useful for effects work: reversing just a cymbal swell or a vocal phrase mid-track, rather than the whole song, needs the region mode specifically.

Why the edges get smoothed

Reversing a chunk of audio in isolation creates a discontinuity at each boundary — the sample values on either side of the cut don't connect smoothly the way they did in the original recording, which is audible as a click. The Edge smoothing slider, from 0 to 50 milliseconds with 8 ms as the starting value, cross-fades the reversed audio into the surrounding unreversed audio (or into silence, at either end of the whole file) to mask that discontinuity. A smoothing window can never exceed half the length of the reversed region itself, so a very short selection still gets a proportionally smaller, safe fade rather than an oversized one that would eat into audio outside the selection.

What reversed audio is used for

What reversing does and doesn't change

The reverse operation only reorders samples — it doesn't touch pitch, tempo, sample rate or loudness, so a reversed clip is the same length and same overall volume as the source. This also means reversed speech is genuinely unintelligible as speech (there's no hidden processing trying to make it sound like anything), which is worth knowing if you were hoping for a specific 'backmasking' effect rather than pure sample reversal.

Reversed exports are capped at 15 a day on the free tier and uncapped on Pro.

Exporting the result

Reversed audio never leaves your device

Decoding, the sample flip, the edge fades and the final encode all run inside this browser tab, so the track you reverse is never sent to a server and there's no upload queue to wait through. Closing the tab discards the decoded samples; the only copy of the result is the file you choose to download.

Questions people ask about Reverse Audio

Can I reverse just the last few seconds of a song and keep the rest normal?
Yes — switch off 'whole file' mode, then mark a region starting a few seconds before the end and ending at the very end of the track. Everything before your marked region plays forward exactly as in the source, and only the marked span plays in reverse.
Why do I hear a click at the start or end of my reversed clip?
This usually means the smoothing window is set too low for the material — try moving the Edge smoothing slider toward its 50-millisecond maximum. The window is automatically capped at half the reversed region's length, so if your selection itself is very short, some residual click may be unavoidable without widening the selection.
Does reversing audio change its pitch?
No. Reversal only changes the order the samples play in, not their values, timing, or spacing, so pitch, tempo, and volume are all identical to the source — just played backward. If you're looking for a pitch or speed change alongside reversal, that's a separate operation this tool doesn't perform.
Will reversed speech become a hidden message if I play it forward again?
Reversing twice just returns you to the original forward audio — there's no processing here that decodes or reveals anything in the reversed signal beyond the literal sample reversal. Any perceived 'hidden message' in reversed audio is a listening phenomenon, not something this tool adds or detects.
Does reversing audio lose quality?
The reversal itself is exact: samples are only reordered. The result is then re-encoded, so a WAV or FLAC export is lossless, while MP3 (128–320 kbps), M4A/AAC and Ogg Opus exports are lossy — reversing an MP3 and saving it as MP3 again adds a second round of compression.
Which formats can I reverse?
The picker takes WAV, MP3, FLAC, M4A/AAC, Ogg and Opus files. FLAC and Opus-in-Ogg are decoded by bundled code; the rest rely on your browser's own decoder, so an Ogg Vorbis file works only where the browser supports it. Output can be MP3, WAV, FLAC, M4A/AAC or Ogg Opus.
Can I reverse audio on my phone?
It runs in a mobile browser as long as that browser can decode the file with the Web Audio API. MP3, WAV and FLAC exports are encoded by the page itself, while M4A/AAC and Ogg Opus exports need the browser's WebCodecs AudioEncoder, so pick MP3 if those two fail.
Is there a file size limit?
There is no size cap in the tool. The whole track is decoded into uncompressed samples in memory — about 210 MB for ten minutes of 44.1 kHz stereo, plus a second copy for the reversed result — so your device's free RAM is the practical ceiling. Free accounts can export 15 files a day.

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Content reviewed 2026-09-27.