How to Tune a Guitar With Your Microphone

When you pluck a string it vibrates at a steady frequency, and that frequency is the note's pitch. The tuner listens through your microphone, measures how many times per second the sound repeats, and converts that frequency in hertz into the nearest musical note.

It then shows how far you are from that note, usually as a needle or meter that sits left when you are flat, right when you are sharp, and centered when you are in tune. All of this analysis happens locally on your device, so the tool never records or uploads any audio; it only measures pitch in real time.

A six-string guitar in standard tuning goes, from the thickest lowest string to the thinnest highest, E, A, D, G, B, and E. The two E strings are two octaves apart, so the low E is the deepest note and the high E is the brightest.

A common way to remember the order is a phrase like Eddie Ate Dynamite Good Bye Eddie. Bass guitar uses the lowest four of these, E A D G, and standard ukulele uses G C E A, so the same microphone tuner works for all of them once you know which note each string should sound.

Play one string at a time. If two strings ring together the tuner sees a blend of frequencies and cannot lock onto a single note, so mute the others with your palm. Pluck with a firm, even attack rather than a hard strike, which can momentarily bend the pitch sharp.

Tune up to the note rather than down to it. Turning the peg to loosen and then tightening into the target takes up slack in the string and holds tuning better. Fresh strings and big pitch changes drift, so play the string a few times and retune until it settles.

Microphone access can feel intrusive, but this tuner only analyzes the incoming sound to find its pitch. Nothing is written to a file, saved, or sent anywhere, and closing the tab ends the access. The microphone stream exists purely to measure frequency in the moment.

Because the work is done on your device, the tuner keeps responding instantly even without a connection once the page has loaded, and no recording of your playing ever leaves the browser.