Guitar Tuner
Use one clear voice or instrument note in a quiet room. Audio stays in your browser.
Chromatic mode follows the nearest note.
Settings & measurement notes
Microphone features need HTTPS and browser permission. Stop or hide/leave the page to release input. Reference tones pause measurement. Noise, harmonics and polyphonic sound can affect estimates.
A4 defaults to 440 Hz. An octave doubles frequency; twelve equal-tempered semitones make an octave.
Related tools
- Instrument Tuner — Compare a single instrument note with a reference.
- Chromatic Tuner — Follow the nearest note across the chromatic grid.
- Tone Generator — Synthesize an audible reference tone or noise locally.
Tune a standard six-string guitar by comparing one open string at a time with its intended pitch. The Guitar Tuner uses your microphone to display note, octave, hertz and cents, with selectable guitar targets and chromatic mode. Check the register before adjusting tension, especially when a string is far from its target.
Tune the open strings
- Select the Guitar preset and check A4, normally 440 Hz.
- Choose the target string you are tuning.
- Start the microphone and allow access.
- Pluck that open string while muting the others.
- Let the attack settle, then make a small adjustment according to flat or sharp feedback.
- Recheck all strings after the first pass.
Use normal playing force rather than striking as hard as possible. The initial attack may move or obscure the reading, while a very quiet tail can become unreliable. Aim for a clear stable portion of the note.
Standard guitar targets and octaves
| String | Target | Approximate frequency |
|---|---|---|
| 6 | E2 | 82.407 Hz |
| 5 | A2 | 110 Hz |
| 4 | D3 | 146.832 Hz |
| 3 | G3 | 195.998 Hz |
| 2 | B3 | 246.942 Hz |
| 1 | E4 | 329.628 Hz |
The two E strings have the same letter but are two octaves apart. Tuning the low E toward the high E’s register is not a small correction. If a target seems implausibly distant, stop and check string number, octave and setup.
Use a fixed string target when necessary
Chromatic mode follows the nearest note. A string that is substantially detuned can therefore be labeled as a different note. Selecting its intended guitar target makes the cents comparison refer to that destination rather than the nearest moving reference.
Negative cents means flat of the target; positive cents means sharp. Once you are near the intended pitch, use small adjustments and repeat the pluck. The tool cannot inspect string condition, bridge movement or tension, so avoid relying on a surprising reading without listening.
Acoustic and electric guitar input
An acoustic guitar can reach a device microphone directly. An unplugged solid-body electric may be quiet, so microphone placement matters. An amplified signal or audio interface can provide another input, but the browser can only analyze devices actually available through its microphone selection.
This page is not a native instrument-input plugin and does not promise direct access to every interface channel. Check operating-system routing and the selected microphone if the level does not respond. Avoid loud speaker playback into a nearby microphone.
Background music and sympathetic strings can compete with the intended note. Mute other strings, reduce room noise and check for clipping. A clean signal matters more than forcing a high input level.
Alternate tunings, capos and twelve-string guitars
The preset is standard six-string tuning. For an alternate target such as low D, use chromatic comparison and verify the intended note and octave yourself. The page does not provide a capo-position calculator or an alternate-tuning library.
A capo changes the sounding open-string pitches. Decide whether you are checking the uncapoed tuning or the pitch with the capo attached. Do not tune capoed strings back to the uncapoed E–A–D–G–B–E targets by mistake.
The six-string preset is not a dedicated twelve-string setup. A twelve-string has paired courses whose octave relationships must be understood separately. Compare one sounding string at a time and use appropriate instrument guidance rather than assuming the preset describes every paired string.
Understand the method’s limits
The live tracker searches roughly 50–2,000 Hz and follows one fundamental. Standard six-string targets fit that search range, but low bass-guitar notes or extreme alternate tunings may fall outside it. The page does not guarantee bass tuning simply because a guitar preset is present.
Harmonics can cause an apparent octave jump. If a reading doubles briefly, let the note settle and try again. A pitch trace can help identify unstable regions, but it is not a complete guitar setup assessment.
Open-string tuning also does not establish correct intonation at every fret. If fretted notes remain wrong after careful tuning, the instrument may need a separate setup check. This tool does not measure action, nut position or fret condition.
Reference and result options
Use the Note to Frequency Converter for target-frequency calculations or the Tone Generator for a reference sound. The Chromatic Tuner offers broader note-by-note guidance.
Live audio stays in memory through this plugin rather than becoming a recording or upload. Stop releases the input; copy or CSV preserves available measurements. The main Pitch Detector explains the shared note, hertz and cents readouts.
Frequently asked questions
Does this work with an acoustic guitar?
A clear open-string sound can be analyzed through a suitable microphone. Noise, distance and device processing can affect the result.
Why is my E string shown as E3?
Check which string is sounding and whether a harmonic is being tracked. The standard open E targets are E2 and E4.
Can I tune with all strings ringing?
Use one string at a time. Several simultaneous notes can mislead the single-pitch tracker.
Does tuning open strings fix fret intonation?
No. Open-string reference tuning and instrument setup across the fretboard are different tasks.