Tune your guitar online
An accurate, modern tuner that runs entirely in your browser. Pluck a string, watch the gauge, and get perfectly in tune in seconds.
Reference tones · pitch pipe
Audio never leaves your device — everything runs locally in your browser.
What are the six guitar strings in standard tuning?
From lowest to highest the six strings are E2, A2, D3, G3, B3, E4 — the famous "EADGBE". Tap the reference tones below to hear each pitch, then turn the tuning peg until the gauge reads the matching note and lights up green.
What does A4 = 440 Hz mean?
440 Hz is the international standard tuning pitch (A440) used by most orchestras and recordings. This tuner locks onto that reference, so once your guitar matches it, you will sound in tune with other musicians, backing tracks and your favourite songs.
What do the cents on the gauge mean?
A cent is one hundredth of a semitone. When the needle sits left of centre (minus) your string is flat / too low; right of centre (plus) means sharp / too high. Between -5 and +5 cents the light turns green and your string is perfectly in tune.
How do I tune a new string that keeps slipping?
Gently stretch a brand-new string, tune it slightly sharp, then bring it back down to the target pitch. Always tune up to the note rather than down — the peg grips better and the string stays in tune longer.
Learn to tune & music theory
Short, friendly guides with the notes, frequencies and theory behind every instrument.
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