Click to enable microphone and start tuning
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—Hz
—Cents
—Octave
♭ FlatIn TuneSharp ♯
Standard Tuning — EADGBE
A4 Reference
440 Hz

Free online guitar tuner — no app needed

The standard EADGBE strings are highlighted in the interface so you can quickly identify which string you're playing. The closest string lights up automatically. When the needle hits the center and the display goes green, you're in tune. The cents deviation is shown numerically so you can be precise — useful when tuning to a slightly detuned piano or playing in a session with non-standard reference pitch.

Most guitarists tune by ear eventually, but having a chromatic tuner is invaluable during warmup, after a string change, or at the start of a rehearsal when the room temperature has changed. Record your practice session with speakandrecord.com to catch intonation drifts during a take.

The A4 reference can be adjusted from the standard 440 Hz. Some orchestras tune to 442 Hz; some early music ensembles use 415 Hz. The tuner recalibrates all note detection automatically when you change the reference.

Why does the tuner sometimes show the wrong note?
Harmonics can confuse pitch detection on certain instruments or in noisy environments. Try plucking closer to the 12th fret for a cleaner fundamental, or move away from background noise sources. The tuner requires a minimum signal level to activate.
Can I use this tuner for bass guitar?
Yes. The chromatic detection works across the full audible frequency range. The standard bass strings (EADG, one octave lower) are detected accurately. The string labels will show the closest guitar string but the note name and Hz will be correct.
Does my audio get sent to a server?
No. All pitch processing happens entirely in your browser using the Web Audio API. Your microphone audio never leaves your device.