Audio Speed Changer
Speed up or slow down audio (0.25× to 3×) with optional pitch preservation. Browser-side.
Quick answer: Speed up or slow down audio (0.25× to 3×) with optional pitch preservation. Browser-side.
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Frequently asked questions
- Will the pitch change with the speed?
- By default yes — speed 2× gives a higher 'chipmunk' pitch. Toggle 'preserve pitch' to apply detune compensation: the speed changes but the pitch stays close to the original.
- How accurate is the pitch preservation?
- Detune is a quick approximation — good enough for podcasts and lectures, but real time-stretching algorithms (like SoundTouch) sound better for music. We can ship that later if there's demand.
- Is the output WAV?
- Yes — browsers can only encode WAV natively. Run the result through our Audio Converter for MP3.
- Are my files uploaded?
- No — both decoding and rendering happen in your browser.
- What's the use-case for slowing audio?
- Transcribing interviews, learning a fast piece of music, breaking down speech for language learning, or making accessibility-friendly versions of fast-paced podcasts.