offlinewebtools.com browser-local workbench
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.
Files are processed locally in your browser using WebAssembly. This input is required.
Saved FFmpeg presets (stored locally)
Preview and export
Inspect the source before running FFmpeg, then preview the generated output before downloading.
Expected output
The generated file preview, size, type, and download action appear here after processing.
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
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.
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.