Audio Speed Changer - Free Online | ToolXHub
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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 the audio file and select a shifting mode: shifting without tone adjustment (time stretching), shifting without tone adjustment (tone shifting), or shifting at the same time. Drag the slider to adjust parameters (0.5x-2x speed,-12 to +12 semitone tones), preview the effect in real time and output it.
Variable speeds and constant tones use a cross-talk coder or WSOLA (Waveform Similarity Overlap Addition) algorithm to change the duration by interpolating or deleting sample points while keeping the frequency components 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 practice the piano), speeding up audiobook playback, adjusting the rhythm of songs to match video, or creating special sound effects (chipmunk, demon sound effects). Processing is done locally in the browser and supports MP3, AAC, OGG and other formats.
Audio switching tool, which can adjust the audio playback speed without changing the tone, or change the tone without changing the speed, supports a switching range of 0.5x-2x.