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Adjust the playback speed of your audio files. Perfect for podcasts, lectures, and music practice.
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Supported: MP3, WAV, AAC, OGG, FLAC, WMA, M4R • Max recommended: 200MB
Time-stretching audio while preserving pitch fidelity is a genuinely hard DSP problem. The Audio Speed Changer handles tempo adjustments from 0.25× to 4× using a phase vocoder algorithm — so voices, instruments, and speech stay natural regardless of playback rate.
Not with pitch preservation enabled. The tool uses a phase vocoder algorithm that keeps pitch independent of tempo, so a voice at 1.5× speed still sounds like the same person — just faster.
For speech, 0.6× to 2× is typically transparent. For music, roughly ±25% from the original is artifact-free. Beyond those ranges, subtle metallic coloring becomes audible on most sources.
Yes. Divide the target duration by the current duration to get your speed multiplier, then apply it. This is standard technique for audio-to-picture sync in video post-production.
Check out our technical guides to learn more about how browser-side processing works.
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