Wave Shifter - key, tune, pitch, speed, tempo - all-in-one

Real-time audio pitch shifter and playback speed controller for videos and music on any website.

Wave Shifter is a lightweight open-source browser extension that lets you change the pitch and playback speed of audio and video directly in your browser. Unlike simple playback-rate controls, Wave Shifter can shift pitch independently from speed, preserve the original pitch while changing playback speed, and apply real-time audio processing using the Web Audio API and Signalsmith Stretch. Features 🎵 Pitch shifting in semitones (-12 to +12) 🎚 Fine pitch adjustment in cents (-50 to +50) ⚡ Playback speed control 🎼 Optional pitch preservation when changing speed 🧠 Smart processing mode for improved performance 🔧 Adjustable processing block size 🎥 Works with HTML5 audio and video elements 🚀 Real-time processing using AudioWorklets 🌐 Fully client-side processing 🔓 Free and open source