How it works
Complete the job in three clear steps
- Choose an audio file.
- Adjust the available settings and create a speed-adjusted WAV.
- Review and download the generated file.
Private Lucaden video & audio tool
Change Audio Speed
Slow down or speed up audio from 0.5× to 2× while retaining its pitch as closely as FFmpeg allows.
Free to use Your source and generated file stay in temporary browser memory and are not uploaded to Lucaden.
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Important
Check the result before relying on it
Keep an untouched copy of important source files. Browser processing depends on available device memory, and you should inspect every downloaded result before deleting the original.
Practical details
What this Lucaden tool does
Slow down or speed up audio from 0.5× to 2× while retaining its pitch as closely as FFmpeg allows.
Extreme speed changes can produce audible artifacts. This route changes duration without intentionally pitch-shifting the source.
Included capabilities
- 0.5× to 2× speed
- Pitch-preserving atempo filter
- WAV output
- Local FFmpeg processing
Useful for
- Slow speech for review
- Speed up a lecture
- Adjust a practice track
- Create a timing variation
Questions
About this tool
Does Lucaden upload the source?
No. The conversion runs locally with browser JavaScript and WebAssembly.
What should I check after conversion?
Extreme speed changes can produce audible artifacts. This route changes duration without intentionally pitch-shifting the source.
Open-source foundations
Built transparently
Lucaden documents its standards sources, architectural references, and permissive runtime dependencies while keeping this workspace consistent with the Lucaden interface.