Online Guitar Tuner

Tune your guitar with your microphone in standard, drop, open or alternate tuning, 45 tunings in all. It’s accurate, free and private, and your audio never leaves your device.

Free, no sign-up
Auto string detection
45 guitar tunings
Mic stays on your device

Standard A4 440 Hz

Press Start tuning, then play a string

0/6 tuned

Standard notes

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

Strings from thick to thin

Standard tuning is E A D G B E, from the 6th (thickest) string to the 1st (thinnest). An easy way to remember it is Eddie Ate Dynamite, Good Bye Eddie.

Pick another tuning in the menu above, and this table, the headstock and the reference tones change right away.

Keyboard shortcuts

Space Start or stop the microphone
1–9 Play a string’s reference note
M Switch Auto / Manual mode

How to tune your guitar online

Allow the microphone

Press Start tuning and allow microphone access. Nothing is recorded, and the sound is analysed on your device.
Pick a tuning and play

Choose standard, drop D or any of the other tunings, then pluck one string and let it ring. Auto mode finds the string for you.
Turn the peg until green

Needle on the left means flat (too low), so tighten. Needle on the right means sharp (too high), so loosen. When it is centred and turns green, the string is in tune.

How does the online guitar tuner work?

urTuner listens to your microphone, measures the pitch about 30 times a second and shows how many cents you are from the nearest string. Within ±5 cents the needle turns green, which means you’re in tune.

No microphone? Tap a string to hear its note, or follow the guide to tuning by ear.

Tips for accurate tuning

Tune up to the note. If a string is sharp (too high), go below the note and then tune back up. The tuning gear holds the string better that way.
One string at a time. Rest your fretting hand on the other strings to keep them quiet, so the tuner hears one clear note.
Let it ring. Pluck the string normally and read the needle after the first second, when the pitch is steady.
Check twice. Tuning one string changes the tension on the neck, so check all the strings a second time.
New strings stretch. After you put on new strings, expect to retune several times on the first day.

Guitar tunings explained

Standard and down-tuned: Half step down, D standard and C standard keep the same intervals between strings as EADGBE but lower every string. This makes bends easier and the sound heavier.

Drop tunings: Drop D, Drop C and Drop B lower the 6th string a whole step more than the others, so you can play power chords with one finger. See them all in the drop tunings chart.

Open tunings: Open G, Open D and Open E play a full chord when you strum the open strings, which is great for slide and fingerstyle. Find more in the open tunings guide.

Alternate tunings: DADGAD, FACGCE and New Standard give you ringing drone notes and wide chord shapes you can’t play in standard tuning. See them all in the list of guitar tunings.

Frequently asked questions

Is this online guitar tuner free?

Yes. urTuner is completely free, needs no account and no app. Open the page, allow the microphone and start tuning.

Does the tuner record or upload my audio?

No. The tuner works entirely inside your browser. The sound from your microphone is analysed live and is never recorded, saved or sent to a server.

Why isn’t the tuner hearing my guitar?

Make sure you allowed microphone access (look for the mic icon in the address bar). Also check that the page is opened over HTTPS and that no other app is using the mic. If the level bar barely moves, raise Mic sensitivity in the settings. Pluck one string at a time.

Which way do I turn the tuning peg?

If the needle is left of centre, the string is flat (too low), so tighten it to raise the pitch. If the needle is right of centre, it is sharp (too high), so loosen it. Always finish by tuning up to the note, so the string stays in tune.

What does A4 = 440 Hz mean?

It is the reference pitch that all other notes are worked out from. 440 Hz is the modern standard. Some orchestras use 442–444 Hz and some players prefer 432 Hz. If you change it in the tuner settings, every string target changes too.

Can I tune an electric guitar without an amp?

Yes. Even unplugged, the strings are loud enough for most phone and laptop microphones. Hold the guitar close to the mic. Or plug it into an audio interface and choose that as your browser’s input.

Does it work for 7-string, 8-string and 12-string guitars?

Yes. Pick the tuning from the menu and the headstock shows every string. For 12-string guitars, tune each pair one string at a time.

Online Guitar Tuner

Standard notes