Back in Black
AC/DC
Tools for guitarists
Free online guitar tuner
Tune an acoustic or electric guitar with your phone or computer microphone. Detect every note in real time, practice with a metronome and explore tunings such as Drop C#, Open C and FACGCE.
- Free, no account
- ◇Private audio
- 13tunings
01
StandardTuning
6E25A24D33G32B31E4
CHROMATIC TUNER · A4 440 HZ
—
Waiting for signal
−50−250+25+50
Pluck a string
02
Saved automaticallyPreferences
Note namesHow notes are displayed
ReferenceFrequency of the A4 note
1
Activate the microphoneAllow access when your browser asks.
2
Pluck a stringThe matching string will light up above.
3
Find the greenWithin ±5 cents, the reading stabilizes for you.
PLAY IN STANDARD
Songs to try in this tuning
Californication
Red Hot Chili Peppers
Nothing Else Matters
Metallica
Rhythm and practiceSet the pulse.
Set the pulse.
Make it yours.
Adjust the tempo manually or follow a song with Tap Tempo, then practice immediately with the metronome.
METRONOME4 / 4
1234
Follow the beatPlay the song and press TAP TEMPO on every beat at least 4 times in a row. The BPM will update automatically.
Why the reading feels steadyHear the attack.
Hear the attack.
Remember the note.
Microphones try to erase a string's sustain. We use the first instant and stabilize what really matters.
Attack first
Captures the cleanest moment before the browser processes the signal.
Green that stays
A stable zone with visual memory keeps good tuning from feeling unreachable.
Only on your device
Audio is never recorded, never travels and needs no account to work.
1.2 svisual memory±5comfort zone0 bytesof audio sent13tunings
Quick guide
How to tune a guitar with a microphone
Choose a tuning, activate the microphone and pluck one string. Turn the tuning peg slowly until the indicator reaches the green zone.
Standard tuning notes
E2 · A2 · D3 · G3 · B3 · E4From the sixth and lowest string to the first: E, A, D, G, B and E.
What in tune means
±5 centsA cent is one hundredth of a semitone. The ±5-cent green zone provides musically stable tuning without forcing you to chase an impossible zero.
Improve detection
One string at a timeUse a quiet room, play close to the microphone and mute the previous string. For electric guitar, use a clean amplifier or an audio interface.
Common questions
Guitar tuning and tempo FAQ
Is this guitar tuner really free?
Yes. You can use the tuner, all thirteen tunings, the metronome and Tap Tempo without installing an app or creating an account.
Is microphone audio recorded or uploaded?
No. Sound is analyzed in real time inside your browser. Audio is never stored or sent to our servers.
Does it work with an electric guitar?
Yes. Place the guitar near a clean amplifier or connect an audio interface. An unplugged electric guitar may be too quiet for some built-in microphones.
What are cents on a guitar tuner?
Cents measure the distance between notes. A negative value means the string is flat and should be raised; a positive value means it is sharp and should be lowered.
Which alternate tunings are available?
Alongside lowered standard tunings, we include Drop D, Drop C#, Drop C, Double Drop D, DADGAD, Open G, Open D, Open C, Open E and FACGCE.
How do I use Tap Tempo with a song?
Play the song and press Tap Tempo with each beat at least four times. The metronome will calculate the rhythm of your taps and update the BPM.
Your experienceHow did tuning
How did tuning
with us feel?
Two quick answers help us improve detection on real devices and microphones.