Guitar tuner · Standard · Drop D · DADGAD
Online guitar tuner, free and with your microphone
Play an open string and the tuner recognizes which one it is, lights up its tuning peg and shows whether it is flat or sharp. For acoustic, electric or classical guitar, with no sign-up and nothing to install.
Press the button and allow microphone access. Your audio never leaves your browser.
Play an open string: the tuner recognizes which one it is and lights up its tuning peg. Tap a peg or a note in the list to hear the correct note and lock it as your target; tap it again to release it.
This is the basic tuner. In MIDI & MusicXML Player the score plays with tempo, key and instrument changes, and there are more than 5,000 scores and exercises to practice with.
See the PlayerIn three steps
Turn on the microphone
Your browser will ask for permission. The audio is analyzed on your own device and is not sent anywhere.
Play an open string
The tuner recognizes the nearest string and lights up its tuning peg on the headstock drawing.
Turn the peg
If it is flat, raise the pitch; if it is sharp, lower it. Green means within 5 cents of the note.
How to tune a guitar with your microphone
A guitar has six strings. They are numbered from the 1st, the thinnest and highest, to the 6th, the thickest and lowest. In standard tuning they sound, from the 6th to the 1st, E, A, D, G, B, E.
| String | Note | Frequency (A4 = 440 Hz) |
|---|---|---|
| 6th | E2 | 82.41 Hz |
| 5th | A2 | 110.00 Hz |
| 4th | D3 | 146.83 Hz |
| 3rd | G3 | 196.00 Hz |
| 2nd | B3 | 246.94 Hz |
| 1st | E4 | 329.63 Hz |
Step by step
- Start with the 6th string and work toward the 1st. Play each string open, without fretting anything.
- Play one string at a time and let it ring for a few seconds; the reading settles after a moment.
- Turn the tuning peg as the tuner tells you: if it is flat, raise the pitch; if it is sharp, lower it.
- Approach the note from below: if you overshoot, drop the string a little under the note and tune back up. That way the string settles and holds its pitch better.
- Check all six strings again: tightening one string moves the others slightly.
Tips for an accurate reading
- Find a quiet spot: background noise and other instruments confuse the reading.
- Bring the microphone of your phone or computer close to the soundhole, without playing too hard.
- With an electric guitar, if you play it unplugged, hold the microphone near the body; with an amp, a few inches from the speaker.
Other tunings
Drop D lowers the 6th string a whole step, from E to D. DADGAD tunes the strings to D, A, D, G, A, D and is widely used in acoustic guitar and Celtic music. Half step down lowers all six strings by a semitone: it is used to play more comfortably or to suit a singer’s range.
Common questions
Is it free?
Yes. The tuner is free and does not ask for sign-up or an email address.
How does it know which string I am tuning?
It detects the frequency of the sound and picks the string of the selected tuning whose note is closest. That string lights up on the headstock drawing. If you prefer to choose it yourself, tap its peg: the correct note sounds and is locked as your target.
Does it work with acoustic, electric and classical guitars?
Yes, all three use the same standard tuning. With an electric, hold the microphone near the strings or the amp speaker; the tuner only uses your device’s microphone and does not accept a cable.
Is my audio recorded or sent anywhere?
No. The microphone audio is analyzed in your browser and is neither sent nor saved.
Why does it ask for microphone permission?
To hear the string and measure its frequency. It cannot tune without a microphone. If you blocked it, you can allow it again from the lock icon next to the page address.
How accurate is it?
It shows the deviation in cents. The reading depends on the microphone, the noise in the room and playing a single string; for very fine adjustment, repeat the reading and compare it with a clip-on or pedal tuner.
What does green mean?
That the note is within 5 cents of the correct one. A cent is a hundredth of a semitone.
Can I tune a ukulele, a bass or a violin?
Yes, in the general online tuner, which includes bass, ukulele, violin and recorder, plus a chromatic mode.
Keep making music
In MIDI & MusicXML Player you can follow the score while it plays, with tempo, key and instrument changes. To practice with a steady beat, there is also the online metronome.