Slowed + Reverb & Pitch by Guilio

Slow down, speed up, and pitch-shift audio on any site, plus reverb, bass, and a lo-fi muffle for background listening. Runs entirely in your browser - nothing uploaded.

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About this extension

Turn any music into the vibe you want - slowed and dreamy, sped-up nightcore, or softened into lo-fi background for studying and working.

Click the toolbar icon on YouTube, YouTube Music, or almost any site with audio, and a compact panel appears:

Speed and Pitch - linked for clean, hi-fi tape-style slowdown, or unlinked for independent pitch shifting
Reverb - from a subtle room to a dreamy wash
Bass - warm it up
Muffle - a low-pass filter that pushes music into the background, great for focus
One-click presets: Slowed + Reverb, Nightcore, Lo-Fi
Master on/off switch; your settings are remembered

Everything runs locally with the Web Audio API. No servers, no uploads, no account, no tracking - your audio never leaves your device.

Full effects work on YouTube and YouTube Music; playback speed works on most other sites too, including embedded players.

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