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Free Online Guitar Tuner with Microphone

Tune guitar, bass or ukulele with your microphone and reference tones.

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How to use this tool

Tune your guitar online with your computer or phone microphone. Press Start tuner, allow the microphone and pluck one string: the tuner shows the note, the frequency and a needle that tells you how many cents the string is flat or sharp. Turn the peg until the needle sits in the green zone. Guitar standard, Drop D, 4-string bass, ukulele and chromatic modes are included, with reference tones for every string.

  1. 01

    Start the tuner

    Press Start tuner and allow microphone access. In Tuning, pick Guitar standard, Guitar drop D, Bass (4-string), Ukulele or Chromatic.

  2. 02

    Play one string

    Pluck a single open string and let it ring. The big letter shows the nearest string, and the needle shows how far off it is in cents.

  3. 03

    Turn the peg

    If it says too low, tighten the string; if too high, loosen it. When the needle sits in the green zone (within ±5 cents) the status reads “In tune”, and you move to the next string.

Standard guitar tuning

From the thickest (6th) string to the thinnest (1st): • 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 A common memory aid is “Eddie Ate Dynamite, Good Bye Eddie”.

Drop D, bass, ukulele and chromatic tuning

• Guitar drop D: the 6th string drops a whole step to D2 (73.42 Hz) for heavier riffs • Bass (4-string): E1, A1, D2, G2 • Ukulele: G4, C4, E4, A4 (the G is higher than the C, called re-entrant tuning) • Chromatic: shows the nearest of all 12 notes, for violin, mandolin, voice or any open tuning Set Reference A4 anywhere from 400 to 480 Hz (440 by default) if your band tunes to 442 or 432 Hz.

Tips for a fast, steady reading

• Tune in a quiet room and hold the instrument close to the microphone • Pluck one string firmly and let it ring • Rest your hand on the other strings to keep them quiet • Tune up to the note: if a string is sharp, loosen it just below the note, then tighten back up so it holds • New strings stretch, so check the tuning again after a few minutes • Recording a cover or lesson for TikTok, Reels or YouTube? Tune right before you press record and use Tap BPM to find the song's tempo

Frequently asked questions

How does an online guitar tuner work?

It listens through your microphone, finds the pitch of the string and compares it with the nearest string of the chosen tuning, showing the difference in cents.

What are the notes of standard guitar tuning?

E A D G B E, from the thickest string to the thinnest: E2, A2, D3, G3, B3 and E4.

What does cents mean?

A cent is one hundredth of a semitone. Within ±5 cents sounds in tune to most listeners, and that is the green zone on the needle.

Which way do I turn the peg?

Tightening the string raises the pitch and loosening lowers it. The direction depends on the headstock; turn slightly and watch the needle.

Can I tune an acoustic or electric guitar?

Both. Play an electric guitar unplugged near the microphone, or through an amp at moderate volume.

Can I tune a bass or ukulele?

Yes. Choose Bass (4-string) or Ukulele in Tuning. For violin, mandolin or other instruments, use Chromatic.

Can I tune by ear?

Yes. Tap a string button under Reference tones to hear its note, then match your string to it.

How do I get a steady reading?

Pluck one string at a time in a quiet room, keep the other strings muted and pluck again once the note fades.

Does it work on my phone?

Yes, in Safari on iPhone and Chrome on Android. Allow the microphone when asked and keep the phone close to the guitar.

Is the guitar tuner free and private?

Yes. It is free with no signup, and the sound is analyzed in this tab only.

For developers

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