How to change audio speed:

1. Select an audio file (MP3, WAV, OGG, M4A, FLAC, etc.)
2. Adjust the "Speed multiplier" slider in the settings panel (right) – values below 1.0 = slower, above = faster
3. Click "Preview Speed" to hear the effect (no file saved)
4. Choose output format (MP3 recommended) and bitrate
5. Click "Apply Speed & Export" – the speed‑changed file will be created locally
6. Download the result with your desired tempo (pitch changes along with speed)

All processing happens in your browser – files never leave your device. Speed change uses sample rate conversion (pitch changes naturally).