gizmobench

Audio Reverser

Choose an audio file, reverse it locally, and preview the result before downloading. Your recording stays on this device while the browser processes it.

Open an audio file

· or drop one anywhere on the stage

Never uploadedNo accountUp to 120 MBUp to 30 minutes
Mode
Length
0:00.000
Export
WAV

Ready. Choose an audio file, or drop one on the stage.

  • 1.25x, pitch kept3:20.000 example source
    2:40.000, same pitch, plays only
  • 0.5x, pitch moves3:20.000 example source
    6:40.000, pitch -12 semitones
  • Reverse3:20.000 example source
    3:20.000 backwards, same pitch

Speed takes any value between 0.25x and 4x: type it in the field as 1.25x or 125%, press the up and down arrows to move it 0.05 at a time, or press one of the chips on the stage. In Speed + pitch the semitone field sets the speed to match, so +12 semitones is 2x. Space plays and stops. The ceilings are 120 MB and 30 minutes, because the whole file is decoded to 32-bit samples in the memory of this tab. Gain runs from -24 dB to +24 dB and plays back at 50% of the level it writes, so a boost does not arrive at full volume in your headphones, and the readout counts the samples that clip before you download anything. The file is never uploaded and never sent anywhere.

What is exact, and what the browser decides. Playback speed is exact and the new length is the old one divided by the rate. Pitch preservation uses the browser's own time stretch, is not available in every browser, and cannot be written to a file: only a rate-coupled speed change, a reverse or a gain change exports as WAV. Gain multiplies every sample and clips at full scale, and the page counts the clipped samples before you export.

Common questions

Does this run in my browser?
Yes. The page performs the core transformation in your browser and explains the result before you copy or download it.

Playback speed is exact and the new length is the old one divided by the rate. Pitch preservation uses the browser's own time stretch, is not available in every browser, and cannot be written to a file: only a rate-coupled speed change, a reverse or a gain change exports as WAV. Gain multiplies every sample and clips at full scale, and the page counts the clipped samples before you export.