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Audio Time Stretch
Change audio playback speed without affecting pitch. Perfect for learning music, creating slow-motion effects, or speeding up audiobooks while maintaining natural sound.
What this tool does
Audio Time Stretch helps you change audio playback speed without affecting pitch. Perfect for learning music, creating slow-motion effects, or speeding up audiobooks while maintaining natural sound.
What you get
Audio Time Stretch produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.
Files are processed locally in your browser using WebAssembly. This input is required.
Saved FFmpeg presets (stored locally)
Playback speed multiplier (0.25x = 4× slower, 2.0x = 2× faster, 1.0x = original speed)
Use Cases
- • 0.5x-0.75x: Learning music, transcription, practice
- • 1.1x-1.25x: Faster audiobook listening
- • 1.5x-2.0x: Quick content review, efficient consumption
- • 2.0x+: Creative effects, time-lapse audio
Report a bug
If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.