Tuner
Plug nothing in. Play a string, and the needle shows how close you are in cents, for guitar, bass, banjo, or ukulele.
Getting a good read
Tap start and allow the microphone. Pluck one string at a time, near the neck pickup or over the soundhole, and let it ring. The needle steadies as the note sustains. Fresh strings and a quiet room both help; a washing machine in the background does not.
Reading the needle
The scale is in cents: hundredths of a semitone. Left of center is flat, so tighten the string. Right is sharp, so loosen it. Inside five cents the needle turns green, which is closer than most ears can hear. Tune up to pitch from below for better stability: if you overshoot sharp, drop below and come back up.
Strings vs chromatic
Strings mode aims you at the nearest string of your chosen tuning, which is what you want while tuning up. Chromatic mode names whatever pitch it hears, useful for checking intonation up the neck or tuning to something unusual. The reference pitch defaults to A440 and can be nudged to match a piano or a band.
Tap a string to hear its reference pitch.
A free online tuner for guitar, bass, banjo, and ukulele
This tuner uses your device microphone to detect pitch and shows how far off you are in cents, so you can tune quickly and accurately. It covers guitar, bass (4, 5, and 6 string), banjo (3 to 6 string, including a Nashville high-strung 6 string), and ukulele (high g, low G, and baritone), with standard and alternate tunings. Nothing is recorded or uploaded: the audio is analyzed on your device and discarded. No account, no ads, no limits.
How to tune your instrument
- Allow microphone access when the browser asks.
- Choose your instrument and tuning.
- Pluck one string and let it ring. The needle shows flat to the left, sharp to the right.
- Tighten or loosen the string until the needle rests in the green center.
- Prefer tuning by ear? Tap any string to hear its reference pitch and match it.
Frequently asked questions
- Is this guitar tuner free?
- Yes, completely. There is no account, no ads, and no usage limit.
- Does it work for bass guitar?
- Yes. It supports 4, 5, and 6 string bass, including drop D. The low B on a 5 or 6 string registers down to about 31 Hz.
- Can I tune a ukulele or a banjo?
- Yes. Ukulele covers standard high g, low G, and baritone. Banjo covers 3, 4, 5, and 6 string, plus a Nashville high-strung 6 string tuning.
- Do I need to download an app?
- No. It runs in your browser on a phone, tablet, or computer.
- Is my microphone audio recorded?
- No. The pitch is analyzed on your device in real time and never sent anywhere.
- What does the cents reading mean?
- A cent is one hundredth of a semitone. Inside 5 cents the needle turns green, which is closer than most ears can hear.
- Can I change the reference pitch?
- Yes. Adjust the A reference from 435 to 446 Hz to match a piano or an ensemble.