Tempo Changer
Change the speed of a song from 25% to 300% while keeping its pitch. Perfect for practice, transcription and DJ edits.
How to use
Drop an audio or video file.
Adjust the sliders and press Preview to hear it.
Apply the effect and download your track.
About this tool
Time-stretching is done with the Signalsmith Stretch algorithm, which keeps vocals and instruments natural even at large changes.
All processing happens locally in your browser, ensuring complete privacy for your recordings and music.
Frequently asked questions
Are my files uploaded?
No. AudioCharger processes everything inside your browser. Your files never leave your device and nothing is stored on a server.
Is it free?
Yes. Every AudioCharger tool is free, with no sign-up, no watermark and no file limits beyond your device's memory.
Which formats can I save as?
MP3, WAV, FLAC, M4A (AAC) and OGG (Opus). MP3 is selected by default.