Guitar Tuner
Tune your instrument quickly and easily
Tap a pegto tune by ear
Or use your micto tune automatically
This free online guitar tuner listens through your microphone and shows how far each string is from the correct pitch, so you can tune an acoustic or electric guitar in a few seconds. You can also play a reference tone for each string and tune by ear. It is a guitar tuner online that works in your browser on a phone, tablet or computer, with no download and no sign-up.
How to tune a guitar
Get your guitar near the mic
Sit with the guitar in playing position and keep your device a short distance from the soundhole or the amp. Switch off the TV or music first.
Start the tuner
Start the tuner and allow microphone access when your browser asks.
Tune the low E string
Pluck the open 6th string, the thickest one, and let it ring. Turn its tuning peg until the tuner shows the string is in tune.
Work up through A, D, G, B, E
Tune the remaining strings in order: A, D, G, B and then the thin high E. Pluck one string at a time.
Finish from below
Turn each peg slowly. If the pitch goes past the note, drop below it and come back up so the string stays put.
Check all six strings again
Play each string once more from low E to high E, because small turns can shift the strings next to them.
Guitar tuning: standard E A D G B E
Standard guitar tuning is E, A, D, G, B, E, from the thickest string (the 6th) to the thinnest (the 1st): E2, A2, D3, G3, B3 and E4. The strings are a fourth apart, except between G and B, which is a major third. The tuner also offers Drop D (D A D G B E) and DADGAD, which you can choose from the tunings menu.
Acoustic and electric guitar
Acoustic and electric guitars use the same standard tuning. An acoustic guitar is easy to tune with the microphone. For an electric guitar, play it through an amp and place your device near the speaker so the microphone hears it clearly.
Tips for keeping your guitar in tune
Retune between songs
Bending notes and strumming hard push strings out of tune. A quick check before you play and between songs keeps chords clean.
Mute the other strings
Rest your fingers lightly on the strings you are not tuning so they do not ring and confuse the tuner.
Intonation check
If open strings are in tune but chords sound off higher on the neck, ask a technician to check your intonation.
Stretch new strings
After restringing, gently pull each string upward off the fretboard to seat windings around the tuning post, then retune.
Guitar tuner FAQ
From the thickest string to the thinnest, standard guitar tuning is E, A, D, G, B, E. In octave terms that is E2, A2, D3, G3, B3 and E4.
Press start, allow the microphone and pluck the low E string. If the tuner reads flat, tighten the peg slightly; if it reads sharp, loosen it. Work through A, D, G, B and high E the same way.
You need one reference note. Play the reference tone for the low E on this page, or use a note from a piano or tuning fork. Tune the 6th string to it. Then press the 5th fret of the 6th string and tune the 5th string until it matches. Press the 5th fret of the 5th string for the 4th string, and the 5th fret of the 4th string for the 3rd string. Press the 4th fret of the 3rd string for the 2nd string, and the 5th fret of the 2nd string for the 1st string.
An electric guitar uses the same standard tuning as an acoustic one. Play it through an amp, place your device near the speaker, and tune one open string at a time with the tuner.
This page is set to the guitar's strings, so it tells you if each string is flat or sharp. If you need to detect any note, use the chromatic tuner on the home page.
Yes. Choose Drop D (D A D G B E) or DADGAD from the tunings menu and tune each string to its new note.
Yes, in a quiet room. Pluck each string clearly and keep your device close to the guitar. A noisy room can make the reading jump, so mute the TV and let the guitar ring on its own.
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