Tuner
Sound is analyzed only on this device. Nothing is recorded, sent, or stored.
Pluck one string at a time and bring the needle to the green center.
How to use it
- Press Turn on mic and allow microphone access. Sound is analyzed on this device only and is never recorded or sent.
- Play one note at a time. The tuner shows the nearest note and how many cents sharp or flat you are.
- When the needle sits in the green center (±5 cents), you are in tune.
What is a cent?
A cent is one hundredth of a semitone. +20 cents means you are a fifth of a semitone sharp. How small a difference you can hear depends on the pitch and the listening conditions, but about 5 cents is a commonly cited threshold. This tuner turns green when you are within 5 cents of the target note.
Cents are a ratio, so the same 1 Hz means much more on a low note. On a bass E1 (about 41.2 Hz), 1 Hz is more than 40 cents, while at A4 (440 Hz) 5 cents is only about 1.3 Hz. That’s why it’s more accurate to go by the cents on the needle than by the Hz number.
Instrument tuners and chromatic mode
Pick guitar, bass, ukulele or violin under Instrument in the settings to get a tuner with a target note for each string. For any other instrument, alternate tunings, a low-G ukulele or tuning with harmonics, stay on this page and set the tuning to Chromatic (any note). It shows the nearest note name and how many cents off you are for any note.
Reference A4
Every note’s target depends on the frequency you choose for A4. The standard is 440 Hz, and some groups tune a little higher, such as 442 Hz. Change it under Reference A4 anywhere from 430 to 450 Hz; the setting applies to every instrument tuner. When you play with others, everyone should use the same value.
Common mistakes
- Letting several strings ring. The tuner can’t tell which note to measure. Play one note at a time.
- Reading the needle the instant the note starts. The tuner measures about 20 times a second and shows the middle value of the last five readings. Let the note ring for a moment.
FAQ
I blocked the microphone by mistake.
Allow the microphone in your browser’s site settings (the lock icon in the address bar), then press Turn on mic again.
Is my playing recorded?
No. Sound is analyzed on this device only and is never recorded or sent anywhere.
Related guides
- Why Do New Guitar Strings Keep Going Out of Tune?
- How to Tune a Guitar by Ear (5th Fret Method)
- A440 Explained: Why Is 440 Hz the Standard Tuning Pitch?
- High G vs Low G Ukulele: Which Tuning Should You Use?
- Bass Won't Tune? How to Tune Low Strings Accurately
- How to Tune a Violin: Fine Tuners, Pegs and the Right Order
- What Is a Cent in Music? How to Read Your Tuner