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Video & Audio Tools

Audio Speed Changer

Listen faster, practise slower, or fit audio to a time limit. Set any speed between half and double, hear it immediately in the player, and save the result with the original pitch preserved.

  • Files stay on your device
  • No sign-up
  • Free to use

How to use Audio Speed Changer

  1. Drop an audio file onto the upload area.
  2. Set the speed with the slider or a quick button; the player previews it and the new length is shown.
  3. Keep the original pitch for natural voices, or untick it for a tape-style effect.
  4. Select Change speed and download the result.

Audio Speed Changer features

0.5× to 2× in fine steps

Any speed in 5% increments.

Live preview

The player plays at the chosen speed before you process anything.

Pitch preserved

Time stretching changes tempo without making voices higher or deeper.

Tape mode

Optionally change pitch together with speed.

New length shown

See how long the result will be.

On-device

Your audio is not uploaded.

When to use Audio Speed Changer

  • Speeding up lectures, podcasts and audiobooks to save time.
  • Slowing down music to learn a difficult passage on an instrument.
  • Slowing speech for language learning and transcription.
  • Fitting a voice-over to a video of a fixed length.
  • Creating slowed or sped-up versions of songs for effect.

Audio Speed Changer FAQ

How is this different from Change Video Speed?

This tool works on audio files and gives fine control between 0.5× and 2× with a live preview. Change Video Speed changes the speed of both the picture and the sound of a video.

Will slowed speech sound robotic?

Moderate changes such as 0.75× sound natural. Very slow speeds can produce slight echo or warble, a normal side effect of time stretching.

What does keeping the pitch mean?

Without it, faster audio sounds higher, like a fast-forwarded tape. Pitch preservation stretches time while keeping frequencies the same.

Can I change the pitch without changing the speed?

Use the Audio Pitch Changer, which shifts pitch in semitones while keeping the original tempo.

What speed is good for podcasts?

Many listeners find 1.25× to 1.5× comfortable for speech.

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Changing tempo without changing pitch

Playing audio faster by simply reading samples more quickly raises every frequency, which is why fast-forwarded tapes sound like chipmunks. To change speed while keeping pitch, software uses time stretching: it splits the sound into short overlapping segments and spaces them closer together or further apart, choosing the overlap points carefully so the waveform stays smooth.

FFmpeg’s atempo filter implements this for speeds between half and double; larger changes are made by applying several stages. Browsers do something similar when you change playback speed in the player, which is why the preview here sounds natural.

Musicians use slowed audio to learn passages note by note without the key changing, and language learners slow speech to catch each word. In the other direction, listening to lectures or podcasts at 1.25× to 1.5× is a common way to save time without losing comprehension.

Turning off pitch preservation recreates the classic tape effect, where speed and pitch change together. It is popular for “slowed” and “sped up” versions of songs, which shift the mood of a track dramatically.

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