Online Guitar Tuner
Tune an acoustic, electric or classical guitar to standard tuning (E A D G B E) with your microphone. Pluck one string, bring the needle to the middle.
🔒 Microphone audio is analysed live in your browser - it's never recorded or sent anywhere.
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How it works
Allow the mic
Press Start tuner - your browser asks once. The sound is analysed live and never recorded.
Pluck one string
Start with the thick low E. The tuner shows which string you're closest to.
Tighten or loosen
Needle left means flat - tighten the peg. Right means sharp - loosen it. Green in the middle is in tune.
How to tune a guitar online, string by string
Standard guitar tuning, from the thickest string to the thinnest, is E A D G B E. This tuner listens through your microphone and shows exactly how far each string is from its note.
Play the low E (6th string)
Pluck the thickest string and let it ring. Turn its peg until the needle sits green on E2.
A and D strings
Next the 5th string (A2) and the 4th (D3). Pluck firmly, then let the note settle before you read it.
G and B strings
The 3rd string is G3, the 2nd is B3. These thinner strings move fast - turn the peg in small steps.
High E (1st string)
The thinnest string is E4, two octaves above the low E.
Check them all again
Tuning one string changes the pull on the neck a little, so go across once more.
Frequently asked questions
What are the notes of standard guitar tuning?
From the thickest string to the thinnest: E2, A2, D3, G3, B3, E4 - often remembered as Eddie Ate Dynamite, Good Bye Eddie.
Can I tune to drop D or open tunings?
Yes - switch to Chromatic. It shows the nearest note for anything you play, so you can tune the low string down to D or any other tuning.
Does it work for electric guitar?
Yes. Play close to your laptop or phone microphone, or through an amp in the same room. A clean sound (no distortion) reads best.
Why does the needle jump around?
Play one string at a time, let the note ring, and mute the others. The first sharp pluck is often a little high - read the note as it settles.
What's A4 = 440?
The reference pitch the whole scale is built from. 440 Hz is the modern standard; some orchestras use 442, and some people prefer 432. Change it if your band or recording uses a different reference.
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