Guitar tuner
Pluck a string — the tuner recognises it and shows whether to tighten or loosen it. It works with your microphone right in the browser; the sound is never uploaded.
Microphone needed
Sound is analysed right in your browser and never uploaded. The browser will ask for permission once.
Guitar tuning
Standard guitar tuning is E A D G B E, from the thick 6th string to the thin 1st string. It works for acoustic, electric and classical nylon-string guitars.
- 6th string — E2, 82.41 Hz
- 5th string — A2, 110 Hz
- 4th string — D3, 146.83 Hz
- 3rd string — G3, 196 Hz
- 2nd string — B3, 246.94 Hz
- 1st string — E4, 329.63 Hz
Other tunings in the list: Drop D, half step down (E♭), whole step down (D standard), Drop C, Open G, Open D, DADGAD.
How to tune a guitar online
- Press "Turn on microphone" and allow access — the sound is processed right in your browser and never uploaded.
- Pluck one string. The tuner recognises it and the needle shows how far it is below or above the note.
- Needle left of centre — the string is flat, tighten the peg. Right — it is sharp, loosen it. The green zone (±5 cents) and a check mark mean the string is in tune.
- Prefer tuning by ear? Tap a string in the list to hear its note.
- Tune from the 6th string to the 1st, then go through them once more: tightening one string slightly changes the others.
- Approach the note from below: if a string is sharp, loosen it below the note and bring it back up — it will hold the tuning longer.
- Pluck the string firmly over the sound hole and let it ring; a muted string is too short for an accurate reading.
- Tuning an electric guitar without an amp? Hold your phone or laptop close to the pickups — the tuner can hear the unplugged strings.
Frequently asked questions
How do I tune my guitar online?
Open this page, allow the microphone and pluck a string. The tuner recognises which string it is and shows how far it is below or above the note. Green zone and a check mark mean the string is in tune.
What is standard guitar tuning?
E A D G B E. The 6th string is 82.41 Hz, the 5th (A) is 110 Hz and the 1st is 329.63 Hz.
What is Drop D tuning?
The 6th string is lowered a whole step from E to D (D A D G B E). Power chords on the low strings take one finger and the sound gets heavier. Pick "Drop D" in the tuning list.
Why does my guitar go out of tune so fast?
New strings stretch for a few days, wood reacts to temperature and humidity, and tuning pegs can slip. Tune up to the note from below and check the tuning before every session.