Online guitar tuner
Tune one string at a time. Start the microphone, or play a guitar reference recording to tune by ear.
Ready
Compatibility input mode; readings may respond more slowly.
Choose a string
Session progress 0/6Front view · 6 is the thickest string, 1 the thinnest. Tap a note to select its tuner; ▶ plays its reference.
Unison pairs must be selected one string at a time. Automatic detection cannot tell the two strings apart.
Detailed readings
Periodicity is a signal score, not an accuracy percentage.
Recent pitch
Last 10 seconds against the current string target. Gaps show missing reliable input; the graph stops at ±50 cents.
Audio stays on your device. Nothing is recorded or uploaded.
Custom tuning
Copy the current tuning, edit notes and octaves, then reorder the physical strings. Saving and sharing are separate actions.
Saved on this device
Settings
Tuning presets
Favorites
Save the current language and engine. Acoustic samples are optional and experimental; without them, reference playback uses a pure tone. Microphone input is never saved.
Standard guitar target frequencies
This table uses Standard tuning and A4 = 440 Hz. The workbench recalculates every target when you change the tuning or calibration.
| Physical position | Note and octave | Hz |
|---|---|---|
| 1 | E2 | 82.41 |
| 2 | A2 | 110.00 |
| 3 | D3 | 146.83 |
| 4 | G3 | 196.00 |
| 5 | B3 | 246.94 |
| 6 | E4 | 329.63 |
Using reference tones
Guitar recordings are the default for the acoustic profile and load when you first press play. They retain the recorded pluck and harmonics, with measured pitch correction. Pure tones are an alternative. Targets outside the available recording range use a clearly labelled pure tone; download failures show an error.
Modes, saving and sharing
Automatic mode chooses a target from the measured pitch. Locked mode compares against the string you selected. Listen-by-ear mode works without a microphone. Saving stays on this device; share links contain targets and calibration, without your custom name.
Guitar tuner FAQ
Is it safe to allow microphone access?
Yes. This tuner runs entirely in your browser: the audio is analysed on your device and never uploaded or recorded anywhere. You can revoke the permission at any time in your browser settings.
What is standard guitar tuning?
Standard tuning is E2 A2 D3 G3 B3 E4, from the thickest string to the thinnest, at 82.41, 110.00, 146.83, 196.00, 246.94 and 329.63 Hz. A common mnemonic: Eddie Ate Dynamite, Good Bye Eddie.
Sample credits
D. Smolken / Karoryfer Samples · CC0-1.0
Shinyguitar microphone archtop recording by D. Smolken / Karoryfer Samples (CC0 1.0). Open Guitar Chords retained approximately 4s with 25ms tail fade, applied bounded f0-curve timewarp with Catmull-Rom interpolation, normalized median steady RMS to 0.2 with 24ms peak conditioning/10ms gain release, and encoded AAC96kbps. Pitch-stabilized recording; not raw, nylon or synthesized sustain.