Guitar Tuner — free, no ads

In tune? Now play

Jam over real drum loops — pick a groove and a tempo and play along like you have a drummer. Find a scale or chord on the fretboard, move a song into a key you can sing with the chord transposer, lock in your timing with a metronome, or borrow a shape from the most popular song structures for your next song. All free, from RockBlocks.

Standard tuning, string by string

With A4 at 440 Hz, from the thickest string (6th) to the thinnest (1st):

Other tunings it covers

• Guitar — Drop D: D2 A2 D3 G3 B3 E4
• Guitar — Half step down (E♭): E♭2 A♭2 D♭3 G♭3 B♭3 E♭4
• Guitar — Full step down (D): D2 G2 C3 F3 A3 D4
• Guitar — DADGAD: D2 A2 D3 G3 A3 D4
• Guitar — Open G: D2 G2 D3 G3 B3 D4
• Guitar — Open D: D2 A2 D3 F#3 A3 D4
• Guitar — Drop C: C2 G2 C3 F3 A3 D4
• Bass — Standard (E A D G): E1 A1 D2 G2
• Bass — 5-string (B E A D G): B0 E1 A1 D2 G2
• Ukulele — Standard (G C E A): G4 C4 E4 A4
• Violin (G D A E): G3 D4 A4 E5

How to tune a guitar

1. Pick your tuning. Choose standard guitar tuning or another one — drop D, half step down, DADGAD, open G, bass, ukulele and more — or Chromatic for any note.
2. Press Start tuning. Allow the microphone when your browser asks. Nothing is recorded or sent anywhere; the sound is analyzed on your device.
3. Play one string. Pluck a single string and let it ring. The tuner shows which string it hears, the note, and how many cents sharp or flat it is.
4. Turn the peg until the needle is centered. If it says flat, tighten the string (tune up); if sharp, loosen it (tune down). The note turns green when you're within 5 cents. Tap a string to lock the tuner to it, or press 🔊 to hear the note and tune by ear.

Frequently asked questions

Is this guitar tuner free with no ads?

Yes. It's free, with no ads, no pop-ups and no sign-up, made by RockBlocks, a free music app. Most free tuner sites are covered in ads; this one is just the tuner.

Does the online tuner record my microphone?

No. The tuner reads the sound in your browser to measure its pitch and throws it away immediately. Nothing is recorded, saved or uploaded. Press Stop and the microphone is released.

What are the notes of standard guitar tuning?

From the thickest string to the thinnest: E A D G B E — E2 (82.41 Hz), A2 (110 Hz), D3 (146.83 Hz), G3 (196 Hz), B3 (246.94 Hz) and E4 (329.63 Hz). A common way to remember it is "Eddie Ate Dynamite, Good Bye Eddie".

How do I tune to drop D?

Choose Drop D and tune the low E string down a whole step to D (D2, 73.42 Hz); the other five strings stay the same. It's often checked by playing the low D against the open D string an octave higher.

What does cents mean on a tuner?

A cent is a hundredth of a semitone. The needle shows how far you are from the target note, from 50 cents flat to 50 cents sharp; within about 5 cents sounds in tune to most ears.

Why won't the tuner pick up my string?

Play one string at a time and let it ring — chords confuse any tuner. Move closer to your phone or computer, check the browser has microphone permission (the icon in the address bar), and turn off noisy fans. Very quiet strings may need a firmer pluck.

Can I tune a bass, ukulele or violin?

Yes. Choose 4- or 5-string bass, ukulele (G C E A), baritone ukulele, or violin (G D A E), or Chromatic to tune any instrument to any note. The tuner hears down to a 5-string bass's low B (about 31 Hz).

What is A4 = 440 Hz?

It's the standard reference pitch: the A above middle C vibrates 440 times a second, and every other note is tuned from it. Some orchestras use 442 or 443 Hz, and some players prefer 432 Hz; set it with the A4 box.

How accurate is an online tuner?

This one uses the YIN pitch-detection algorithm, accurate to well under a cent on a clean string, and it doesn't jump an octave on low strings the way simpler tuners can. Your microphone and the room matter more than the math.