Online Tuner — Guitar, Vocal & Instrument (Mic)
Online Tuner (Mic)
A free chromatic tuner that hears you through the mic: play or sing any note and watch the needle. Works for guitar, bass, ukulele, violin, brass — and your voice.
A chromatic tuner in your browser
This free online tuner listens through your microphone, detects the pitch of whatever you play or sing, and shows the nearest note plus how many cents sharp or flat you are. Chromatic means it recognizes all 12 notes — so it tunes guitar, bass, ukulele, violin, cello, brass, and works as a vocal pitch trainer too.
How to tune
- Click Start tuner and allow microphone access.
- Play one string or sing one note at a time, reasonably close to the mic.
- Watch the needle: left means flat (tune up), right means sharp (tune down). Within ±5 cents the note turns green — you are in tune.
Standard tunings quick reference
Guitar: E2 A2 D3 G3 B3 E4. Bass: E1 A1 D2 G2. Ukulele: G4 C4 E4 A4. Violin: G3 D4 A4 E5. If a note reads correctly but an octave off, that is normal — tune to the note name and trust your ear for the octave.
Why A4 = 440 Hz (and when it isn’t)
Modern standard pitch puts A4 at 440 Hz, but orchestras tune anywhere from 441–443 and baroque ensembles at 415. Change the A4 box and the whole tuner re-calibrates. Curious what frequency each note is? The Note to Frequency Calculator has the full table.
FAQ
Is this tuner free?
Yes - free forever, no ads, no sign-up. The audio is analyzed in real time on your device and never recorded or uploaded.
How accurate is it?
The pitch detector resolves well under 1 cent on a clean, sustained note. Background noise and very short plucks reduce accuracy - let notes ring.
Why does the needle jump around?
Polyphonic sound (two strings ringing), room noise, or a very quiet signal. Mute other strings, get closer to the mic, and the needle settles.
Can I use it to train my singing pitch?
Absolutely - sing a note and hold it, and the cents readout shows exactly how close you are. Singers commonly aim to stay within about 10 cents of target.
Does it work for drop tunings and bass?
Yes. It is fully chromatic down to about 40 Hz, which covers a 5-string bass low B (31 Hz is borderline - use the octave harmonic).
Related free tools
In tune? Now get in the mix.
The free Ultimate Mic Guide finds the right mic for you, and the plugins on Meshplugins.com make every take sound expensive.
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