Change audio speed for listening or export
Use the player to review a lecture, podcast, voice memo, song, or language recording at a comfortable rate. A slower speed can make dense speech easier to follow, while a faster rate can shorten review time.
Playback pitch versus exported pitch
During live playback, modern browsers can preserve the speaker's original pitch. The downloadable WAV is made with browser-native resampling: faster exports sound higher and slower exports sound lower. This transparent distinction avoids promising studio-quality time stretching that the browser is not performing.
Private browser processing
The file is decoded with the Web Audio API and the WAV is assembled locally. Large or long recordings require more memory, so keeping this tab open until processing finishes is recommended.
Frequently asked questions
Can I change audio speed without uploading the file?
Yes. SuperUtils reads, plays, and processes the audio inside your browser. The source file is not sent to a server.
Does changing playback speed change pitch?
The live player asks the browser to preserve pitch. The downloadable WAV uses browser resampling, so its pitch changes with the selected speed.
Which audio files work?
Support depends on your browser. MP3, WAV, M4A, OGG, and WebM audio commonly work, but codec support varies.