Change Audio Speed

Keep pitch or change it

• Keep natural pitch: the tempo changes but voices sound normal — best for speech and learning.
• Change pitch with speed: faster sounds higher, slower sounds deeper, like playing a tape faster.

Typical speeds

• 1.25× – 1.5×: listen to lectures and podcasts faster.
• 0.75×: practise songs or understand fast speech.
• 2× and more: skim long recordings.

Formats

The output keeps the original format when possible, or you can choose MP3, WAV or M4A. Several files are processed one after another.