Independent tempo & pitch: practice mode, nightcore-style or voice effects.

How to use

1. Load audio → set Tempo % and Pitch semitones.
2. Presets: Practice, Nightcore, Chipmunk, Deep.
3. Process → MP3 download.

About this tool

Two sliders, two different jobs: tempo changes duration without changing key (practice at 75%), pitch changes key without changing duration (remix vocal fits). Set both and you get the classic meme effects. The engine is FFmpeg's asetrate→aresample→atempo chain, executed on your machine — no uploads, no watermark. Your file never leaves this page — processing runs in your browser via WebAssembly; nothing is uploaded and the file is dropped from memory when you close the tab.

FAQ

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