Audio Speed Changer - Free Online | FunToolX
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Audio Speed Changer
Load audio, drag the slider to set speed (0.5x–2x), re-render and export WAV.
About this tool
Audio Speed Changer is a free online tool. Change playback speed without altering pitch.
Upload an audio file and select a variable speed mode: variable speed without pitch adjustment (time stretching), variable speed without pitch adjustment (pitch shifting), or variable speed adjustment at the same time. Drag the slider to adjust the parameters (0.5x-2x speed,-12 to +12 semitone pitch), preview the effect in real time and export it.
Variable speed and unchanging tone uses a Phase Vocoder or WSOLA (Waveform Similarity Overlap-Add) algorithm to change the duration by interpolating or deleting sample points while keeping the frequency component unchanged. Changing the tone without changing the speed changes the sampling rate by resampling, and then resampling back to the original sampling rate.
It is suitable for making slow practice tracks (musicians practicing the piano), accelerating audiobook playback, adjusting the rhythm of songs to match videos, or creating special sound effects (chipmunk sound effects, demon sound effects). Processing is done locally in the browser and supports MP3, WAV, OGG and other formats.
Audio shifting tool, which adjusts the audio playback speed without changing the tone, or changes the tone without changing the speed, supports a 0.5x-2x shifting range.