Privacy Policy

Last updated: October 16, 2026

Key Changer is a Chrome extension that changes the musical key of the audio playing in a browser tab. It does not collect any data. This page explains exactly what it does and why it asks for each permission.

What Key Changer collects

Nothing. Key Changer does not collect, sell or share personal data, browsing history, audio or usage statistics, and it sends nothing to a server. It has no accounts, no tracking and no analytics.

How it works

When you change the key, Key Changer processes the sound of the current tab on your computer, using the Web Audio API built into Chrome. It works with the video and audio players on web pages, including YouTube, embedded YouTube and Vimeo players, and the Spotify web player. The sound is never recorded, saved or uploaded.

The extension makes no network requests. All of its code, including the audio engine, comes packaged with it.

What stays in your browser

• For each open tab (chrome.storage.session): the key shift and the song key you set, the site's domain (such as www.youtube.com, never the full page address) and a few technical details the popup needs, such as whether the sound is being changed. They are deleted when you close the tab or quit Chrome.
• Until you remove the extension (chrome.storage.local): whether you've seen the first-run tips, which embedded players you chose not to allow, and the state of the rating prompt. That state is up to five dates on which you changed the key, and whether you rated Key Changer or chose “Not now”.

None of this leaves your browser. Everything is deleted when you remove Key Changer.

Permissions, explained

activeTab

Lets Key Changer work with the current tab only after you click its icon or press one of its keyboard shortcuts. It's used to change the sound in that tab and to show the site's name in the popup.

scripting

Runs Key Changer's own audio script in that tab when you ask to change the key. On some sites the player is hidden inside the page's own code, so the script also runs there to reach it.

storage

Keeps the small amount of data listed above in your browser.

Optional access to video players

Key Changer doesn't ask for this at install. Chrome asks you only when you click “Allow access to …” in the popup on a page with an embedded YouTube or Vimeo player. The access lets Key Changer change the sound of that player and is used for nothing else. You can turn it off at any time in Chrome's extension settings.

*://*.youtube.com/*

YouTube videos embedded on other websites.

*://*.youtube-nocookie.com/*

YouTube videos embedded in privacy-enhanced mode.

*://player.vimeo.com/*

Vimeo videos embedded on other websites.

Pages Key Changer opens

• A welcome page, once, right after you install it.
• A removal page, which Chrome opens after you remove the extension. It asks why you removed it.
• If you rate Key Changer in the popup, 4 or 5 stars open its reviews page in the Chrome Web Store, and 1 to 3 stars open our feedback page. Your rating isn't added to the address and isn't sent anywhere.

The welcome, removal and feedback pages are hosted on GitHub Pages. Answers you choose to send from the removal or feedback page (a reason, a comment and, if you add it, your email) go to the developer through Google Forms. Only what you type is sent, and sending is optional.

Changes

If this policy changes, the new version will be posted at this address with a new date at the top.

Contact

Questions? Open an issue on GitHub.

YouTube and Chrome are trademarks of Google LLC. Vimeo is a trademark of Vimeo.com, Inc. Spotify is a trademark of Spotify AB. Key Changer is an independent project and is not affiliated with or endorsed by Google, Vimeo or Spotify.