Guitar Tuner
Tune your guitar online with real-time pitch detection. Supports Standard, Drop D, Open G, DADGAD, and more tunings. Works in your browser — no app needed. 100% in-browser — no app or signup required.
Tuning
Select string
How to Tune Your Guitar
1. Allow Microphone Access
The tuner starts listening automatically when you open this page. Accept the microphone prompt to let it hear your guitar.
2. Pick a Tuning (Optional)
Standard tuning is selected by default. Switch to Drop D, Open G, DADGAD, or any other preset from the tuning bar if needed.
3. Pluck Your 6th String First
The lowest string (thick E) is selected by default. Pluck it and watch the needle — tighten the peg if flat (♭), loosen if sharp (♯).
4. Auto-Advance Through Strings
Once a string is in tune for 1.5 seconds, the tuner automatically advances to the next string. Work your way through all six.
Why Use Our Guitar Tuner
Real-Time Pitch Detection
Uses your microphone and the Web Audio API for accurate, low-latency autocorrelation pitch detection.
8 Tuning Presets
Standard, Drop D, Open G, DADGAD, Open E, Open A, Half-Step Down, and Full Step Down.
Needle & Strobe Modes
Classic analog needle gauge or professional strobe display — switch any time.
Fully Private
Audio is processed entirely in your browser. Nothing is recorded or sent to any server.
Adjustable Reference A
Set A4 from 430–450 Hz. Useful for orchestras, period instruments, or regional tuning standards.
Auto-Advance Strings
Holds in the in-tune zone for 1.5 seconds then automatically moves to the next string.
Frequently Asked Questions
Does it work offline?
Yes. Once the page is loaded, the tuner runs entirely in your browser using the Web Audio API. No data is sent anywhere.
What are "cents"?
A cent is 1/100th of a semitone. ±5 cents is inaudible to most listeners. ±50 cents means you are halfway between two notes.
What is the Reference A setting for?
Standard pitch is A4 = 440 Hz. Some orchestras use 442 Hz (European standard) or even 415 Hz (Baroque). Adjust this to match your ensemble.
Why is strobe mode more precise?
Strobe tuners display the phase relationship between your pitch and the reference continuously. When the sectors appear fully stationary, your pitch is exactly correct — giving sub-cent precision that needle gauges cannot match.
What is DADGAD tuning?
DADGAD (D–A–D–G–A–D) is an open modal tuning used in Celtic and fingerstyle guitar. It creates a rich drone sound and is associated with players like Jimmy Page and Pierre Bensusan.
Can I use this on my phone?
Yes. The tuner works on any modern smartphone or tablet browser that supports Web Audio API and getUserMedia (Chrome, Firefox, Safari 14+).