Key Changer

If a song sits a little too high for your voice, or your guitar is tuned down a step and the recording isn't, Key Changer moves the track to meet you. It works on the audio already playing in a Chrome tab. You open the popup and shift by semitones, up to 12 in either direction, and there's a separate fine tune of 50 cents each way for recordings that are slightly off standard pitch. Speed doesn't change.

Keyboard shortcuts cover the common moves. Alt+Shift with the up or down arrow changes one semitone, and Alt+Shift+0 goes back to the original. Once you've set a shift for a song, the extension stores it and applies it again the next time that song is detected, which saves a step when you practise the same set every week. Returning a song to its original pitch deletes that saved entry.

The Keep vocals natural option is the distinctive part. A plain pitch shift makes a singer sound chipmunky going up and thick going down. This setting, which is on by default, uses the developer's own WebAssembly engine to keep the voice closer to the original while the music moves. The homepage has an A/B player with Pixabay demo tracks so you can compare the engine with the original at the same shift. Turning it off gives a slightly cleaner direct shift if you only care about the instruments.

Mikhail Eshchenko, who publishes Key Changer, says it started with existing Chrome pitch-changing tools that didn't sound right: upward shifts made vocals cartoonish and downward shifts felt heavy or distorted. The answer was a proprietary audio engine, and Key Changer is the first released application built on it.

The answers also draw a clear line around scope. Key Changer processes the audio playing in a desktop Chrome tab on supported sites, not your whole system, so it won't change native or mobile app audio, and there's no SDK or API for other developers yet.

Singers, instrumentalists, karaoke fans and music teachers who practise with songs that live on streaming sites. It runs on desktop Chrome only. Most web players work directly on the page. Players that use DRM or route audio in unusual ways need one extra click on Enable on this tab, which switches to Chrome's tab capture. Chrome doesn't let extensions touch its own internal pages, the Web Store or the built-in PDF viewer, so it won't work there.

The privacy notice, effective October 29, 2026, is detailed. Tab audio is processed in memory and is never recorded, saved or uploaded, either to the developer or to an outside audio service. Saved pitch settings stay in local Chrome storage and are removed when you uninstall. What does leave the device is limited to feedback you choose to send and basic setup diagnostics on the uninstall page, which are kept for 90 days. The broad access to all sites is there so it can find media players wherever you use it, and the notice explains each permission.

Key Changer is free during early access. The site doesn't say what happens to pricing after that.