Slow Down Audio
Hear fast passages clearly. The pitch stays natural, so you can still tell what you are playing or hearing.
MP3, WAV, M4A, FLAC, OGG, Opus, AIFF, WMA, AMR and the sound of most videos. Files stay on your device.
How it works
- Choose an audio file.
- Pick a speed such as 0.75x or 0.5x; pitch is preserved by default.
- Preview it, and select a section to practice.
- Export and download the slowed copy.
Slow down without changing the pitch
The pitch stays the same by default, so a slowed passage still sounds like the original notes, which matters when you are learning a piece or working out what was said. Presets at 0.5x, 0.6x, 0.75x, 0.8x and 0.9x cover the usual practice speeds; Custom accepts any value from 0.25x to 4x.
If you would rather have the pitch drop with the speed, like a slowed record, switch the method to "Speed (pitch changes)".
Practice and transcription workflow
- Drag on the waveform to select the hard section.
- Turn on Loop in the player and press play to hear the section repeat.
- Choose a speed with Preview, then turn on "Process only the selected part" and export that section as its own file.
- Step the speed up over several days: 0.6x, 0.75x, 0.9x, then the original.
What to expect
At 0.5x and below, sustained notes and voices sound smooth, but sharp attacks such as plucked strings and drums can soften. For lectures and voice memos it is usually transparent from 0.75x to 0.9x. The tool does not remove noise or make unclear speech clearer; it only slows it.
Questions
What speed should I use to transcribe an interview?
0.75x to 0.8x is a common choice: slow enough to type along, close enough to natural speech. Go lower only for difficult sections.
Can I slow down a song to learn it on an instrument?
Yes. Keep the pitch preserved so it stays in tune with your instrument, and use a selection and loop for the hard parts.
Why does a slowed song sound a little smeared?
Slowing without changing pitch means the engine has to invent time between the original notes. Percussion and fast plucked notes show it most. A smaller slowdown reduces it.
Does it work on voice memos recorded on a phone?
Yes. M4A, MP3, WAV and the other common formats can be opened; the output keeps the same format by default.