Tune your guitar right in the browser using your microphone — it detects the note and tells you how many cents sharp or flat you are. Standard, Drop D, half-step down and more. No install, no sign-up. Tap a string to hear its reference pitch, or just play and watch the needle.
| 6th — low E | E2 · 82.41 Hz | thickest string |
| 5th — A | A2 · 110.00 Hz | |
| 4th — D | D3 · 146.83 Hz | |
| 3rd — G | G3 · 196.00 Hz | |
| 2nd — B | B3 · 246.94 Hz | |
| 1st — high E | E4 · 329.63 Hz | thinnest string |
Mic tuning is fastest, but the classic 5th-fret method always works: fret the low E string at the 5th fret — that's an A, matching your open A string. Tune the open A to it. Repeat 5th-fret-to-next-open-string for A→D and D→G. For the B string use the 4th fret of G (not the 5th), then back to the 5th fret of B for the high E. Tune up to a note rather than down to it so the string settles in tune. A fresh set of strings will drift for a day or two — retune often.
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Teaching or blogging? This tuner is free to embed on your own site with one line of HTML.
Yes. It uses real-time pitch detection from your microphone and shows the exact note plus cents sharp/flat, so it is as accurate as a clip-on chromatic tuner in a reasonably quiet room.
No. It runs entirely in your browser, free, with no sign-up, download or account.
Standard tuning from the thickest to the thinnest string is E, A, D, G, B, E.
Yes — pick the preset and the reference notes update automatically for Drop D, Eb/half-step down and other alternate tunings.
Yes. It works in mobile browsers on iPhone and Android as long as you allow microphone access.