Free Guitar Tuner Online: Standard & Drop D Tuning

Free Online Guitar Tuner (Microphone)

Tune your guitar quickly and accurately with our free online microphone tuner. No app download required—simply allow microphone access, select your tuning, and play a string.

How to Use This Tuner

1. Enable Microphone: Click "Start" and allow browser permission.
2. Select Tuning: Choose Standard, Drop D, or other presets.
3. Play a String: Pluck one string at a time.
4. Tune Up/Down: Adjust until the needle hits the green center.

Standard Guitar Tuning (EADGBE)

Standard tuning is the most common configuration for 6-string guitars. From the thickest string (Low E) to the thinnest (High E):

String	Note	Frequency (Hz)	Mnemonic
6 (Thickest)	E2	82.41 Hz	Eddie
5	A2	110.00 Hz	Ate
4	D3	146.83 Hz	Dynamite
3	G3	196.00 Hz	Good
2	B3	246.94 Hz	Bye
1 (Thinnest)	E4	329.63 Hz	Eddie

Popular Alternate Tunings

Drop D Tuning (DADGBE)

Lowers the 6th string from E to D. Popular in rock, metal, and grunge for heavier power chords.

• Tuning: D - A - D - G - B - E
• Famous Songs: Everlong (Foo Fighters), Killing in the Name (Rage Against the Machine)

Half Step Down (Eb Standard)

Every string is tuned down one semitone (half step). Reduces string tension for easier bending and deeper tone.

• Tuning: Eb - Ab - Db - Gb - Bb - Eb
• Famous Songs: Sweet Child O' Mine (Guns N' Roses), Pride and Joy (Stevie Ray Vaughan)

Open G Tuning (DGDGBD)

The guitar sounds like a G Major chord when strummed open. Essential for slide guitar and Keith Richards' style.

• Tuning: D - G - D - G - B - D
• Famous Songs: Start Me Up (Rolling Stones), Walkin' Blues (Robert Johnson)

DADGAD Tuning

Celtic and folk favorite. Creates a suspended D4 sound that is lush and ambiguous.

• Tuning: D - A - D - G - A - D
• Famous Songs: Kashmir (Led Zeppelin), Black Mountain Side

How to Tune by Ear (Relative Tuning)

If you don't have a digital tuner handy, use the 5th Fret Method:

1. Tune the Low E string to a reference pitch (another instrument or E2 sine wave).
2. Play the 5th fret of Low E (A note) and match the open A string to it.
3. Play the 5th fret of A (D note) and match the open D string.
4. Play the 5th fret of D (G note) and match the open G string.
5. Play the 4th fret of G (B note) and match the open B string (Note the fret change!).
6. Play the 5th fret of B (E note) and match the open High E string.

Common Guitar Tuning Problems

Why does my guitar go out of tune immediately?

• Old Strings: Old strings lose elasticity and pitch stability. Replace them every 3-6 months.
• New Strings: New strings need stretching. Pull them gently away from the fretboard to "seat" them.
• Temperature/Humidity: Wood expands/contracts. Allow your guitar to acclimate to new environments.
• Nut Issues: If you hear a "ping" while tuning, the string is binding in the nut slot. Lubricate with graphite (pencil lead).

Why does the tuner fluctuate?

• Background Noise: Use a quiet room or plug in directly if possible.
• Old Strings: Corroded strings produce inconsistent overtones (harmonics) that confuse tuners.
• Tone Knob: Roll your guitar's tone knob down (off) to cut high harmonics and give the tuner a clearer fundamental note.

FAQ

What is 440 Hz?

A4 = 440 Hz is the standard concert pitch reference. All other notes are calculated from this reference. Some players prefer 432 Hz, but 440 Hz is the global standard for modern music.

Can I tune a 12-string guitar with this?

Yes! For the lower 4 string pairs, tune the thinner string one octave higher than the standard pitch. For the top 2 string pairs (B and E), tune them in unison to the same pitch.

Is this tuner accurate enough for intonation?

Yes, our chromatic tuner uses advanced pitch detection accurate to within 0.1 cents, suitable for setting intonation and professional recording.

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