After importing audio, adjust the speed slider for real-time preview. Click 'Apply Speed' to regenerate the waveform and audio data. Finally, you can download the result or save it to your library.

'Apply Speed' updates the current editor state, allowing you to continue working on the new waveform. 'Download' directly exports the current preview result as a file.

Yes. As long as you don't refresh the page, you can click the 'Reset to Original' button at any time to restore the audio to its initial state.

All speed rendering happens locally in your browser to protect your privacy. For longer audio, the system needs to recalculate every sample point to ensure lossless quality, which requires some computing power.

Smart Speed uses FFmpeg's atempo algorithm to change playback speed while preserving the original pitch. It is ideal for audiobooks, lectures, or DJ mixing. Preview still changes pitch; the final applied or exported result keeps the original pitch.