Question 1

How does the audio reverser work?

Accepted Answer

Drop or pick an audio file. We decode it with the Web Audio API into raw PCM samples per channel. Then we reverse the Float32Array for each channel (end-to-start) and re-encode the result as a 16-bit PCM WAV. The reversed file plays the original audio backwards.

Question 2

What reverse modes are supported?

Accepted Answer

Four modes: (1) Full — reverse the entire buffer end-to-start. (2) Per-channel — reverse each channel independently (same result as Full for typical audio, but exposed for transparency). (3) Segment — split the buffer into N equal segments (1, 2, 4, 8, or 16) and reverse each segment individually, keeping the segment order intact. (4) Interleaved — reverse an interleaved stereo stream (rarely needed but supported).

Question 3

What about clicks at the boundaries?

Accepted Answer

Reversing audio can place a non-zero sample at the start or end of a segment, causing an audible click. The tool detects zero-crossings at segment boundaries and warns you, plus applies an optional fade in/out (default 5 ms) at the start/end of each segment to suppress clicks.

Question 4

What extra features does this tool have compared to others?

Accepted Answer

(1) Full reverse (entire buffer). (2) Per-channel reverse. (3) Segment reverse (split into N segments, reverse each). (4) Interleaved reverse (for stereo). (5) Fade in/out generator (avoid clicks). (6) Click detector (zero-crossing analysis at boundaries). (7) Time calculator (unchanged duration). (8) File-size estimator. (9) Pure-JS 44-byte RIFF WAV encoder (16-bit PCM). (10) Timestamped filename generator. (11) History (localStorage, last 20). (12) Shareable URL settings. (13) Drag-and-drop file input. (14) Summary stats (input/output size, channels, segments). (15) Segment presets (1, 2, 4, 8, 16 segments).

Question 5

Is my data sent anywhere?

Accepted Answer

No. The audio file you load, decoded samples, and output WAV never leave your browser. There is no upload. Reverse metadata in history is stored in localStorage on this device only.

Audio Reverser

How to use