Local privacy
Files are decoded in memory and never sent to Tervix.
Audio Tempo Changer
Adjust tempo while approximately preserving pitch.
Your files are processed locally and are never sent to our servers.
Drop an audio file here or choose one
This browser cannot perform this operation or decode this format.
How to use this tool
- 1
Choose a tempo factor while approximately preserving pitch.
- 2
Review the waveform, parameters and browser limitations.
- 3
Preview and download the result without leaving the browser.
Transparent local audio
Real compatibility
Codecs the browser cannot process are never promised.
Verifiable export
Edits export as PCM WAV and batches as ZIP.
Frequently asked questions
How does tempo differ from speed?
Tempo targets duration while approximately retaining pitch; speed changes both.
Is my file uploaded?
No. Loading, processing and export happen on your device.
Why might a format fail?
Each browser exposes different codecs. Tervix reports the error and preserves the source.