Audio Speed Changer
Runs in your browser — your files are never uploaded.
Speed a recording up or slow it down without changing its pitch. Playing audio faster the naive way — by resampling — raises the pitch and produces the chipmunk effect; time-stretching instead keeps voices sounding like themselves. Useful for getting through a lecture or an interview faster, or slowing something down enough to transcribe it accurately.
OptionsBitrate: Default — best quality for size
How to use Audio Speed Changer
- 1
Drop your audio onto the box, or click to choose a file.
- 2
Pick a speed — 1.5× is the usual sweet spot for speech.
- 3
Click “Convert” to save the result as MP3.
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Frequently asked questions
Will voices sound squeaky?+
No. The audio is time-stretched rather than resampled, so the pitch is unchanged at every speed offered here. Resampling is what makes sped-up audio sound like a chipmunk, and it is not what this does.
What speed works for speech?+
1.25× and 1.5× are comfortable for most people with a little practice; 2× is workable for a clear single speaker and hard going for a conversation. Below 0.75× the artefacts of stretching start to become audible.
How is 4× possible when the filter stops at 2×?+
By chaining it. ffmpeg’s tempo filter accepts 0.5–2.0 in one pass, so 4× is applied as two passes of 2×, which multiply out exactly. Tools that pass 4 straight through either fail or silently drop the audio.
Does the quality suffer?+
Slightly, and more at the extremes. Time-stretching has to invent the transitions between what it keeps, which is audible as a faint warble on music at large factors. Speech holds up much better than music does.