Is the PluckTune online tuner free?

Yes. The PluckTune tuner is free to use in a modern browser and does not require an account.

Which instruments and tunings does it support?

It supports 6-, 7-, 8-, and 12-string guitar, 4- and 5-string bass, and standard, low-G, and baritone ukulele presets, including selected drop and down tunings.

Does the tuner need microphone permission?

Yes. Microphone permission is required so the browser can detect the pitch of the note you play.

PluckTune

Free Online Guitar Tuner for Guitar, Bass, and Ukulele

Tune through your device microphone with real-time pitch detection and a clear cent meter. PluckTune includes practical presets for acoustic and electric guitar, bass, and ukulele, with no download or account.

Start Tuning See Tuning Notes

Live Cent Feedback

See whether the played note is flat, sharp, or in tune with a centered cent meter.

Auto or Locked Target

Let PluckTune identify the nearest string automatically, or lock the target while tuning in noise.

Useful Tuning Presets

Switch among standard, Drop D, half-step-down, extended-range, bass, and ukulele setups.

Adjustable Concert Pitch

Set A4 from 432 to 446 Hz when an ensemble or recording uses a reference other than A440.

How to Tune Your Guitar Online

Select Start Tuning, choose Guitar, and pick the tuning preset you need.
Allow microphone access when your browser asks. Pluck one string at a time in a reasonably quiet room.
If the meter says flat, tighten the string gradually. If it says sharp, loosen it.
Stop when the indicator centers, then repeat for the remaining strings.
Make one final pass: changing one string's tension can slightly affect the others.

For the cleanest reading, pluck near the middle of the string, mute the other strings, and wait for the attack to settle before adjusting the peg.

Standard Guitar, Bass, and Ukulele Tuning Notes

Guitar and bass run low to high; ukulele is listed string 4 to string 1.
Instrument	Standard tuning	Also available in PluckTune
6-string guitar	E2 – A2 – D3 – G3 – B3 – E4	Drop D and half step down
7-string guitar	B1 – E2 – A2 – D3 – G3 – B3 – E4	Drop A
4-string bass	E1 – A1 – D2 – G2	Drop D
5-string bass	B0 – E1 – A1 – D2 – G2	Standard 5-string
Ukulele	G4 – C4 – E4 – A4	Low G and baritone

PluckTune also includes standard 8-string and 12-string guitar presets. The tuner remembers your selected preset and reference-pitch setting for the next practice session.

Why a Guitar Can Sound Out of Tune After the Meter Centers

A tuner measures pitch, but setup and technique still matter. Pressing too hard can pull a fretted note sharp. Old strings may intonate unevenly, and a guitar that is in tune on open strings can still need bridge or neck adjustment if notes higher up the fretboard drift.

Start with fresh, stretched strings; approach the target pitch from below; and compare open strings with notes around the twelfth fret. Persistent differences are usually a setup or intonation issue rather than a tuner issue.

Online Tuner FAQ

Is the PluckTune online tuner free?: Yes. It is free and does not require an account.
Does it need microphone permission?: Yes. The live tuner needs access to your microphone to detect the note you play. Pitch analysis runs in the browser.
Can I tune without automatic note detection?: Yes. Select a specific string to lock the target, which is useful when background sound makes automatic matching difficult.
What does a cent mean?: A cent is one hundredth of a semitone. A reading near zero means the played pitch is centered on the target note.