Slowed & Reverb

Slowed + Reverb for YouTube and Spotify

Slow down the song you're playing on YouTube, YouTube Music or Spotify and add reverb with one click. It changes the song while it plays, so there's nothing to download or convert.

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Press play to hear a short clip, then drag the slider. The song is “Start Again” by Alex Beroza featuring Snowflake & Subliminal (CC BY 3.0), shortened to 24 seconds and made quieter.

Add to Chrome Add to Firefox

Using Edge or Brave? Use the Chrome button.

Try it here

This is the same panel that opens when you click the extension's icon in your browser. It works on this page too, so press play above and try the presets and sliders on the song.

Slowed + Reverb and Nightcore are built in. When you find a sound you like, you can save it under My Presets and use it again later. The palette icon changes the colors of the panel and of this page.

See what every button and slider does

Getting started

  1. Add it to Chrome or Firefox with one of the buttons above.
  2. Pin it so it's easy to find. Click the puzzle-piece icon next to the address bar. In Chrome, click the pin next to Slowed & Reverb. In Firefox, click the gear next to it and choose Pin to Toolbar.
  3. Play a song on YouTube, YouTube Music or Spotify in your browser, then click the Slowed & Reverb icon. Slowed + Reverb turns on right away.
  4. Change anything you like. The switch at the top turns it off again.

On Spotify, the first time you use it, the panel shows an Allow on Spotify button. Click it and accept your browser's question, and Spotify reloads once. Firefox asks the same way for YouTube.

Free to use

There's no paid version and no account to make. The extension doesn't collect anything about you or what you listen to, and it doesn't show ads. It only changes the sound inside your browser. The code is public on GitHub if you'd like to check.

Privacy policy Source code on GitHub

Why I made it

I made this because the slowed + reverb extensions I tried were closed source and kept their best features behind a subscription. I wanted one I could trust and just use. So the code is public, it asks for as little access to your browser as it can, and every feature is free.