Change Audio Speed — Speed Up or Slow Down Without Changing Pitch

Speed up or slow down audio from 0.5× to 3×, keeping the original pitch or shifting it like a tape. Free, no sign-up, and your files never leave your device.

Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.

Speed up a lecture to save time, or slow down a song to learn it. Choose any speed from 0.5× to 3×. With Keep pitch the audio is time-stretched so voices don't sound like chipmunks; with Change pitch too it behaves like a tape or record played faster or slower.

Time-stretching uses a WSOLA algorithm that runs on your device. It sounds natural for speech and most music between 0.75× and 1.5×; extreme settings can sound slightly phasey.

Step by step

  1. Upload audio: Drop any audio file or video.
  2. Set the speed: Drag the Speed slider or click a preset like 1.25× or 0.75×. The new length is shown.
  3. Choose pitch behaviour: Select Keep pitch (time-stretch) or Change pitch too (like a tape).
  4. Preview: Click Preview first 15 seconds to hear the result.
  5. Download: Choose a format and click Download.

Handy for

Lectures & podcasts

Listen at 1.25–1.5× and save the faster version.

Learning music

Slow a solo to 0.75× without changing its key.

Transcription

Slow speech down for easier typing.

Creative effects

Use tape mode for “nightcore” or slowed-down edits of your own tracks.

Good to know

  • For speech, 1.25×–1.5× usually stays perfectly intelligible.

  • Tape mode at 2× raises pitch by exactly one octave.

Questions

Will the pitch change?

Not with Keep pitch — only the tempo changes. Choose Change pitch too if you want the pitch to rise and fall with the speed.

Can I change pitch without changing speed?

Not with this tool. Combining tape mode with an opposite time-stretch would do it, but that isn't offered as a single control yet.

Is there a length limit?

There's no fixed limit, but editing tools hold the decoded audio in memory — about 21 MB per minute of stereo sound (32-bit samples). An hour-long recording is fine on most computers; multi-hour files may be slow on phones.

Are my audio files uploaded anywhere?

No. Decoding, editing and encoding all happen inside your browser tab. Nothing is sent to a server, and closing the tab discards everything you haven't downloaded.

More Audio Tools tools

  • Volume Booster & Normaliser — Boost or reduce loudness, or normalise to a target peak, with a soft limiter that prevents distortion.
  • Reverse Audio — Flip any recording so it plays backwards, and save the result as MP3 or WAV.
  • Fade In & Fade Out Audio — Add a smooth fade-in and fade-out to any track, choosing the length and curve.
  • Text to Speech — Have text read aloud with your device's voices, or generate a downloadable spoken MP3 or WAV.
  • Speech to Text — Transcribe recordings or your microphone into text and subtitles with an on-device Whisper model.
  • Online Tone Generator — Generate sine, square, sawtooth or triangle tones, sweeps and white or pink noise, and download them.

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