Tune Your Guitar Perfectly
Professional-grade chromatic tuner with real-time pitch detection
Standard Tuning
Click any string to hear the reference tone
Real-Time Detection
Instant pitch recognition with autocorrelation-based audio processing.
Reference Tones
Built-in reference tones for each string when you'd rather tune by ear.
Chromatic Mode
Detects any note across all octaves — works for any stringed instrument.
How to use this tuner
Click Start Tuning and allow your browser to access the microphone. Pluck a single string and watch the needle. The big letter is the closest note to what you played; the meter underneath shows how many cents flat (left) or sharp (right) you are. When the needle settles on zero and the readout turns green, that string is in tune.
Work one string at a time, keep the room quiet, and re-pluck rather than holding the string — a fresh attack gives the detector a cleaner signal than a fading note. If a string doesn't register, check the browser's permissions, or pick up the volume by playing closer to the microphone.
Standard guitar tuning at a glance
Standard tuning runs from the thickest string to the thinnest as E2 · A2 · D3 · G3 · B3 · E4. The reference panel on this page uses the same numbering you'll see in most chord books — string 6 is the low E, string 1 is the high E. For the reasoning behind those intervals and a few common variations, see the standard tuning explained page.
Going beyond standard
Chromatic mode means the tuner doesn't insist on the six standard notes. Drop D, DADGAD, Open G, half-step down, and other alternate tunings all work the same way: tune each string to the note it should be in that tuning, and the meter will tell you when you're there.
If you prefer to set strings by ear — useful when a battery dies, or just as ear-training — the tune a guitar by ear guide walks through the fifth-fret method and harmonic tuning.
Why an online tuner can be accurate
Modern browsers expose a fast, low-latency audio pipeline through the Web Audio API. With reasonable input quality, a software autocorrelation routine can match the practical accuracy of a clip-on tuner for most playing situations. The trade-offs and the limits live on the how an online tuner works page, including a short note on when a dedicated strobe tuner still wins.