Audio Speed Changer
Speed audio up to 4× or slow down to 0.25× — useful for podcasts and language practice.
Your audio stays on your device. Processing happens locally in your browser.
Drag & drop an audio file
or click to browse — MP3, WAV, M4A, AAC, OGG, FLAC
1.00×
0.25×1×4×
Result
What is Audio Speed Changer?
Speeding up podcasts to fit them in a commute, slowing down a song to learn a riff on guitar, or making a lecture digestible — speed changing is one of the most useful audio tools for everyday use. This tool uses linear interpolation to resample your audio. As is standard for "speed change without preserving pitch", faster playback raises the pitch and slower playback lowers it, which is what most users actually want.
How to use Audio Speed Changer
- Upload audio — Drop any browser-supported audio file.
- Pick a speed — Use the slider or one of the presets. 1.5× and 2× are great for podcasts; 0.5× for music transcription.
- Apply and preview — Hear the result before saving.
- Download — Save the time-stretched WAV file.
Frequently Asked Questions
Resampling without time-stretching changes pitch with speed. Pitch-preserving time-stretch (PSOLA, phase vocoder) needs a much heavier algorithm and is on our roadmap.
Linear interpolation introduces a tiny amount of high-frequency softening. For voice content it's inaudible; for high-quality music, use a DAW.
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