Tune your guitar using your microphone — free and accurate
For best results, tune in a quiet room. Background noise can interfere with pitch detection.
Pluck one string and let it ring. The tuner works best with a single clear note.
This tuner works on your phone's browser. Hold your phone near the guitar for best pickup.
If a string is sharp, loosen it below pitch then tune back up. This helps the string hold tune better.
Tune your guitar accurately using just your computer or phone's built-in microphone. Our chromatic tuner detects the pitch of any note you play and shows you in real time whether you're sharp, flat, or perfectly in tune.
Click "Start Tuning" and allow microphone access when your browser asks. Then pluck a guitar string — the tuner will automatically detect the note and show you how close you are to the correct pitch. The needle moves left if you're flat (too low) and right if you're sharp (too high). When the needle is centered and turns green, you're in tune.
Standard guitar tuning from lowest to highest string is E2, A2, D3, G3, B3, E4. This tuning has been the standard for six-string guitars for centuries and is used in virtually all genres of music. The low E string vibrates at 82.41 Hz, while the high E string vibrates at 329.63 Hz.
Our tuner supports several popular alternative tunings. Drop D (DADGBE) lowers the 6th string by one whole step, commonly used in rock and metal. Half Step Down (Eb Ab Db Gb Bb Eb) was famously used by Jimi Hendrix and Stevie Ray Vaughan. Open G (DGDGBD) is popular in blues and slide guitar. Open D (DADF#AD) is another common slide tuning. DADGAD is a Celtic/folk favorite.
This tuner uses your device's microphone and the Web Audio API to analyze incoming sound in real time. It employs an autocorrelation algorithm to determine the fundamental frequency of the note being played, then compares it to known note frequencies to determine which note you're closest to and how many cents sharp or flat you are.