Tempo Changer — Faster or Slower, Same Pitch
Speed up or slow down music, pitch stays true.
Runs 100% in your browser — nothing is ever uploaded.
What is Tempo Changer?
Change the tempo of any track from 50% to 200% without altering the pitch. Free, private and 100% in your browser — WAV export. Upload an audio file, tune the settings, preview the result and download it as a WAV file. No installation, no account and no upload: the whole process happens client-side in your browser, which keeps your data 100% private.
How to use Tempo Changer
- Open Tempo Changer — it supports MP3, WAV, OGG, M4A and FLAC.
- Upload your audio file; it is decoded locally in your browser.
- Tune the settings, then click Process to render the result.
- Preview the output and download it as a WAV file.
Frequently asked questions
Is Tempo Changer really free?
Yes — Tempo Changer is 100% free with no limits, no watermarks and no registration. You can use it as often as you like, on as many files or inputs as you need.
Is my data safe when I use Tempo Changer?
Absolutely. Tempo Changer runs entirely in your browser using JavaScript — your input is processed on your own device and is never uploaded to any server.
Does Tempo Changer work on mobile devices?
Yes. Tempo Changer works in any modern browser on desktop, tablet and mobile (Chrome, Firefox, Safari, Edge) — there is no app to install.
Are my audio files uploaded?
Never. Your file is decoded and processed with the Web Audio API directly in your browser. It never touches a server — processing even works offline.
What formats can I upload and download?
Upload anything your browser can play: MP3, WAV, OGG, M4A/AAC and FLAC in most browsers. The processed result downloads as a high-quality WAV file.
Is it really free? Any length limit?
Completely free with no watermark. There is no hard length limit — a typical 3-5 minute song processes in seconds; very long files just need more memory.