Guitar Tuner
Tune your guitar online with your microphone. Standard guitar tuning is E – A – D – G – B – E from the 6th (thickest) string to the 1st. Press Start tuner, play one string at a time and turn the peg until the needle is in the middle.
Your browser will ask to use the microphone. Choose Allow.
✓ All strings in tune
Tap a string to hear it and tune only that string. Audio is analysed on this device and never uploaded. How it works →
- What it does
- Hears each guitar string, shows which one, its note, Hz and cents
- What it does not do
- Record or upload audio · detect chords
- Reference pitch
- A4 = 440 Hz, adjustable 415–466 Hz
- Tested with
- 58 studio recordings of 11 instruments (right note on about 95% of frames at normal volume) and test tones from B0 to C6
- Made by
- The Appcellent team
- Updated
- November 2026
Tuner not hearing you?
- Allow the microphone. If you blocked it: in Chrome or Edge, click the icon left of the address bar → Microphone → Allow, then reload. In Safari on iPhone, tap aA → Website Settings → Microphone → Allow. In Firefox, click the crossed-out microphone in the address bar. On a Mac, also check System Settings → Privacy & Security → Microphone for your browser.
- Open the page in Safari or Chrome. In-app browsers (Instagram, Facebook, TikTok) often block the microphone.
- Play one note at a time, louder. Hold your phone or laptop close to the instrument and let the string ring. A quiet room helps.
- Wrong octave or jumping notes? Let the attack fade for a moment — the reading settles once the note is steady.
- No microphone at all? Tap a string button to hear its note and tune by ear.
Guitar string notes and frequencies
Standard guitar tuning is E2 (82.41 Hz), A2 (110.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), B3 (246.94 Hz) and E4 (329.63 Hz), from the lowest string to the highest (A4 = 440 Hz).
| String | Note | Frequency |
|---|---|---|
| 6 | E2 | 82.41 Hz |
| 5 | A2 | 110.00 Hz |
| 4 | D3 | 146.83 Hz |
| 3 | G3 | 196.00 Hz |
| 2 | B3 | 246.94 Hz |
| 1 | E4 | 329.63 Hz |
How to tune your guitar
- Press Start tuner and allow the microphone. Hold your phone or laptop close to the guitar’s sound hole or amp.
- Play the low E (6th) string and let it ring. The tuner finds the string automatically.
- If the needle is left of center the string is flat — tighten the peg. Right of center is sharp — loosen it.
- When the note turns green the string is in tune. Repeat for all six strings, then check them once more.
Standard guitar tuning (E A D G B E)
Almost every guitar song uses standard tuning, also called E standard. The strings from thick to thin are E, A, D, G, B, E. A popular way to remember it is “Eddie Ate Dynamite, Good Bye Eddie”.
The two E strings are two octaves apart, and every pair of neighbouring strings is a perfect fourth apart except G to B, which is a major third.
D standard tuning
D standard is D – G – C – F – A – D: every string one whole step below standard. Chord shapes stay the same and everything sounds two semitones lower, which suits heavier rock and some singers. Pick D standard in the tuning menu above.
How to tune a guitar without a tuner
Use the 5th-fret method once one string is right (tap the low E button above to hear it):
- Press the 6th string at the 5th fret — it should match the open 5th string (A).
- 5th string, 5th fret = open 4th string (D).
- 4th string, 5th fret = open 3rd string (G).
- 3rd string, 4th fret = open 2nd string (B).
- 2nd string, 5th fret = open 1st string (E).
When two notes match, the slow wobble between them (beating) disappears.
Tips for a stable tuning
- Tune up to the note. If you overshoot, go below and come back up — the string settles better and stays in tune longer.
- New strings stretch. Pull each one gently away from the fretboard and retune a few times.
- Tune in a quiet room. Background music or voices can confuse any microphone tuner.
- For an electric guitar without an amp, hold the microphone right next to the strings.