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Change audio speed

Choose a playback-speed preset or use the slider. The time-stretch process keeps the original pitch.

No file bytes are sent to Lutrakit.

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Change audio speed while retaining its pitch

Speed up speech or slow down a passage for listening practice. The tool changes tempo while retaining pitch rather than shifting voices higher or lower with the speed.

How to use it

  1. Select an audio file and choose a speed preset or adjust the multiplier between 0.25× and 4×. The initial setting is 1.5×.
  2. Process the file; a value above 1 shortens it and a value below 1 lengthens it.
  3. Download and listen to the result, particularly consonants, music and pauses, before deciding whether the setting is useful.

Example

Starting point
A 120-second recording at 1.5× speed.
What to expect
About 80 seconds of audio: 120 ÷ 1.5. At 0.5×, the same passage would take about 240 seconds. Encoding can introduce small duration differences.

Before you start

  • Changing tempo re-encodes the audio and can introduce audible artifacts, especially at extreme settings. Retaining pitch does not mean identical sound quality.
  • The tool does not offer a separate output-format selector. Format support and processing limits depend on the decoder, encoder and browser memory; a small compressed file can still require substantial memory.