Does changing the speed degrade audio quality?

No. The audio buffer is linearly interpolated and exported as uncompressed 16-bit PCM WAV to preserve studio-grade fidelity.

Are my audio files uploaded anywhere?

Never. Decoding and resampling run exclusively in your browser using the HTML5 Web Audio API.

You can upload MP3, WAV, AAC, M4A, OGG, and FLAC audio files.

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High Fidelity

Speed up or slow down audio tracks, podcasts, and recordings with crystal-clear 16-bit WAV export

Supports MP3, WAV, AAC, M4A, OGG, and FLAC. Fast Web Audio DSP processing directly on your device.

100% In-Browser Privacy0.25x to 3.0x RangeHigh-Fidelity 16-Bit WAV