SoftwareGenerators & Utilities
Online Guitar Tuner
Turn on the microphone, pluck one string and turn the tuning peg until the needle sits in the middle and goes green. The tuner recognises the string automatically and supports guitar, bass, ukulele, violin and a chromatic mode.
Free
No Sign-up
Runs on Your Device
-
0.0 Hz · 0 cents
Microphone audio is analysed in your browser and is never recorded or sent to a server. The microphone turns off when you press Stop or leave the page.
How to Tune a Guitar with Your Microphone
Place your phone or laptop near the guitar, press Start Tuning and pluck the strings one at a time. The centre circle shows the note being heard and the needle shows the difference in cents (hundredths of a semitone). Turn the peg slowly while you keep plucking. Strings that are in tune get a tick on the headstock.
5
Instruments
Guitar, 4 and 5-string bass, ukulele, violin, plus chromatic.
±3
Cent precision
YIN pitch detection with interpolation, finer than most ears can hear.
15
Tunings
Standard, Drop D, half step down, Open G, DADGAD and more.
0
Recordings
Audio is processed on your device and never sent anywhere.
Guitar, Bass and Ukulele String Notes
Frequencies are calculated with A4 = 440 Hz. String 1 is the thinnest string.
| Instrument | String | Note | Frequency |
|---|---|---|---|
| Guitar | 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 | |
| Bass | 4 | E1 | 41.20 Hz |
| 3 | A1 | 55.00 Hz | |
| 2 | D2 | 73.42 Hz | |
| 1 | G2 | 98.00 Hz | |
| Ukulele | 4 | G4 | 392.00 Hz |
| 3 | C4 | 261.63 Hz | |
| 2 | E4 | 329.63 Hz | |
| 1 | A4 | 440.00 Hz |
Tips for More Accurate Tuning
- Tune up to the note. If a string is sharp, loosen it below the note first and then tighten up to pitch. The gears hold better when they stop while tightening.
- Pluck over the sound hole with medium force. A hard pluck pushes the pitch up for a moment. Read the needle once the note is steady.
- Go round twice. Changing one string changes the pull on the neck, so check every string again after the first pass, especially with new strings.
- New strings go out of tune quickly. New strings keep stretching for a day or two. Gently pull each string after fitting it, then retune a few times.
- Check intonation at the 12th fret. Compare the open string with the note at the 12th fret. If the 12th fret is sharper or flatter than one octave, the saddle needs adjusting at a guitar shop.
Frequently Asked Questions
Press Start Tuning and allow the microphone. Pluck one string and let it ring. If the needle is on the left (too low, flat), tighten that string's tuning peg a little at a time. If it is on the right (too high, sharp), loosen it. The string is in tune when the needle is centred and the circle turns green. Repeat for all six strings.
Standard tuning from the thickest string (string 6) to the thinnest (string 1) is E2, A2, D3, G3, B3, E4. A popular way to remember it is "Eddie Ate Dynamite, Good Bye Eddie". Strings 6 and 1 are both E, two octaves apart.
Pluck only one string and mute the others with your hand. Hold the phone close to the sound hole and reduce background noise. A very hard pluck makes the pitch rise briefly, so read the needle after about a second when the note settles.
Drop D lowers string 6 from E to D so power chords can be played with one finger, popular in rock and metal. Half step down (Eb) lowers every string by a semitone, used by many classic rock bands. Open G and DADGAD make the open strings form a chord, great for slide and fingerstyle. Pick one from the Tuning menu.
String mode shows how far you are from the selected string (or the nearest string when auto is on), ideal for guitar, bass, ukulele and violin. Chromatic mode reads any note from C to B, useful for other instruments, unusual tunings or checking your voice.
A4 = 440 Hz is the international standard reference pitch. Some orchestras use 442 Hz and some musicians prefer 432 Hz. If you play along with a piano or recording that is slightly off, change the reference so your guitar matches the other instruments.
Yes. Select a string and press Play Note to hear that string's pitch. Pluck your string at the same time and turn the peg until the two sounds merge without any wobble (beating). This takes some practice, so the microphone is still easier and more accurate.
No. Microphone audio is only analysed in your device's browser to find the pitch. It is not stored and not sent to any server. The microphone turns off when you press Stop, switch tabs or close the page.