Guitar Tuner

Tune your guitar, bass or ukulele online with MiniWebtool’s Guitar Tuner: play a string and the needle shows if it is too high or too low, or tap a string to hear its note. Standard, Drop D, open and more tunings.

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Help me understand MiniWebtool's Guitar Tuner: https://miniwebtool.com/guitar-tuner/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

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Guitar TunerTry it now — free ▼

A string 20 cents flat, D string 15 cents sharp, then all six in tune

A free guitar tuner that listens through your microphone: the needle shows whether a string is too low or too high, and each string turns green once it is in tune.

Instrument:

Tuning

Allow microphone access, then pluck one string at a time. No mic? Tap a string below to hear its note.

—

Press start and play a string

-50-250+25+50

♭ Flat (too low) In tune Sharp (too high) ♯

Ready — choose a tuning and start

⚙ More settings: any-note mode, reference pitch

Mode

Reference pitch A4 (Hz)

🎸 Strings & Reference Tones

Tap any string to play its reference tone and tune by ear. As each string comes into tune it turns green.

🎼 Any-note mode shows the nearest note to whatever you play, for instruments and tunings that are not in the list. Switch back to By string to tune string by string.

0 / 6 strings tuned

🎉 All strings in tune — you're ready to play!

Embed Guitar Tuner Widget

About Guitar Tuner

The Guitar Tuner tunes your guitar right in the browser with your microphone, with no app to install. Play a string and the tuner shows the note, a needle that swings left when the string is flat and right when it is sharp, and the string turns green once it is in tune. It also tunes bass, ukulele, violin, viola, cello, mandolin and banjo, and every string can play its own reference note if you would rather tune by ear.

At a Glance

Guitar Tuner listens through your microphone and shows with a needle whether each string is too low, too high or in tune, for guitar, bass, ukulele and more.

Guitar Tuner: features at a glance
Feature	What you get	Good for
Needle you can read	Flat, sharp or in tune, with the note and how many cents off	Tuning in seconds
Strings turn green	Each string gets a check mark once it holds in tune	Knowing you are done
Many instruments	Guitar, 7-string, 4- and 5-string bass, ukulele, violin, viola, cello, mandolin and banjo	One tuner for everything
Alternate tunings	Drop D, Half-Step Down, Drop C, Open G, Open D, DADGAD and more	Songs in other tunings
Tune by ear	Tap a string to hear its note, no microphone needed	Noisy rooms and blocked mics
Any-note mode	Shows the nearest note for any instrument or tuning	Instruments not in the list
Remembers you	Your instrument, tuning and reference pitch reopen next time	Tuning before every practice

How to Tune Your Guitar

Pick your instrument (Guitar is selected already) and the tuning. Standard E A D G B E suits almost every song.
Press Start Tuning and allow the microphone when your browser asks.
Play one open string at a time, starting with the thickest one, and let it ring.
Read the needle: left of centre means the string is too low, so tighten the peg; right of centre means it is too high, so loosen it.
Stop when the needle sits in the middle and the note turns green. The string gets a check mark.
Go round every string, then once more, because tuning one string slightly changes the others.

Standard Guitar Tuning Notes

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

String	Note	Pitch	Frequency (A4 = 440 Hz)
6th (thickest)	E	E2	82.41 Hz
5th	A	A2	110.00 Hz
4th	D	D3	146.83 Hz
3rd	G	G3	196.00 Hz
2nd	B	B3	246.94 Hz
1st (thinnest)	E	E4	329.63 Hz

Bass, Ukulele, Violin and Other Instruments

Choose the instrument at the top of the tuner and the strings below change to match. The notes are listed the way players name them on the instrument.

Instrument	Standard tuning	Notes
Bass (4-string)	E A D G	E1 A1 D2 G2, an octave below the guitar’s four lowest strings
Bass (5-string)	B E A D G	Adds a low B0 below the E string
Ukulele	G C E A	G4 C4 E4 A4: the G string is higher than the C (“My Dog Has Fleas”)
Ukulele, low G	G C E A	G3 C4 E4 A4, for a fuller, deeper sound
Baritone ukulele	D G B E	D3 G3 B3 E4, the same as a guitar’s top four strings
Violin / Mandolin	G D A E	G3 D4 A4 E5
Viola	C G D A	C3 G3 D4 A4
Cello	C G D A	C2 G2 D3 A3
Banjo (5-string)	G D G B D	Open G: the short 5th string is the high G4

Alternate & Open Guitar Tunings

Drop and lowered tunings sound heavier and are easier on the voice; open tunings make a full chord when you strum the open strings, which is why slide players love them.

Tuning	Notes (6th → 1st)	Great for
Drop D	D A D G B E	Rock, metal, one-finger power chords
Half-Step Down	Eb Ab Db Gb Bb Eb	Hendrix, SRV, Guns N’ Roses, Nirvana
Full-Step Down	D G C F A D	Heavier riffs, a lower singing key
Drop C	C G C F A D	Modern metal and hard rock
Open G	D G D G B D	Slide guitar, blues, Keith Richards riffs
Open D	D A D F# A D	Slide, folk, fingerstyle
Open E	E B E G# B E	Bright slide and blues
Open C	C G C G C E	Deep, ringing fingerstyle
DADGAD	D A D G A D	Celtic, folk, open drones
7-String	B E A D G B E	Extended-range rock and jazz

Tips for Accurate Tuning

🔇 Tune in a quiet room

Fans, TVs and voices make the needle wander. On a phone, hold the instrument close to the bottom of the phone, where the microphone is.

🎯 Tune up to the note

If you go past the note, drop below it and tighten back up. A string tuned upward holds its pitch longer.

👆 One string at a time

Play a single open string and rest your other fingers on the rest, so only one note rings.

🔁 Go around twice

Each string you tighten pulls on the neck a little, so a second pass fixes the strings you tuned first.

🎸 New strings stretch

Fresh strings keep going flat for an hour or so. Pull each one gently away from the fretboard, then retune.

👂 No mic? Use the tones

Tap any string on the diagram to hear its note, then turn the peg until your string sounds the same.

Frequently Asked Questions

How do I tune my guitar with an online tuner?

Press Start Tuning, allow the microphone, and play one open string at a time. If the needle sits left of centre the string is too low, so tighten the peg; if it sits right of centre it is too high, so loosen it. When the needle is in the middle the note turns green and the string gets a check mark.

What are the standard guitar tuning notes?

From the thickest 6th string to the thinnest 1st string, standard tuning is E A D G B E (E2, A2, D3, G3, B3, E4). A common way to remember it is "Eddie Ate Dynamite, Good Bye Eddie".

Can I tune a bass or a ukulele with it?

Yes. Choose Bass, Ukulele, Violin, Mandolin or Banjo at the top of the tuner and the strings change to match: E A D G for a 4-string bass, B E A D G for a 5-string, G C E A for a ukulele (with low G and baritone options), G D A E for violin and mandolin, and C G D A for viola and cello.

Do I need a microphone?

Only for the needle. Without a microphone, tap any string on the diagram to hear its note and turn the peg until your string sounds the same. This also works when the room is too noisy for the microphone.

Why is the tuner not hearing my guitar?

Check that you allowed the microphone: in Chrome or Edge click the icon left of the address bar, and on an iPhone open Settings, then Safari, then Microphone. Close other apps that use the microphone, play the string firmly close to the device, and make sure only one string is ringing.

Do I tighten or loosen the string?

Tighten when the needle is on the flat (left) side, because the note is too low. Loosen when it is on the sharp (right) side. If you pass the note, go a little below it and tighten back up, so the string holds its pitch.

What does A4 = 440 Hz mean, and should I change it?

It is the pitch every other note is measured from, and 440 Hz is the modern standard. Leave it alone unless you are playing along with a recording or a group tuned slightly differently, such as 442 Hz, or 432 Hz for some home recordings.

Why does the needle jump around?

The needle settles once one clear note rings. Mute the other strings with your fretting hand, pluck with the thumb rather than a pick, wait a moment after the attack, and move away from fans or voices. Low bass strings ring slowly, so give them a second.

Additional Resources

Reference this content, page, or tool as:

"Guitar Tuner" at https://MiniWebtool.com/guitar-tuner/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: October 26, 2026

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