Online Chromatic Tuner
Free real-time pitch detection for any instrument. Works in any browser, no app download.
Click "Start Tuner" to use your microphone - audio stays private in your browser
How to Tune Your Instrument
Click "Start Tuner" and approve microphone access when the browser asks. Audio never leaves your device.
Pluck or bow a single open string (or sing a single pitch). The tuner detects one pitch at a time.
The large letter shows the nearest note. The meter needle shows if you are flat (left) or sharp (right). Green means in tune.
Tighten the tuning peg to go sharp, loosen to go flat. Keep adjusting until the needle is centered and green.
Standard Tuning Reference
Target notes and frequencies for common instruments (A4 = 440 Hz)
| String | Note | Frequency |
|---|---|---|
| 6th | E2 | 82.4 Hz |
| 5th | A2 | 110.0 Hz |
| 4th | D3 | 146.8 Hz |
| 3rd | G3 | 196.0 Hz |
| 2nd | B3 | 246.9 Hz |
| 1st | E4 | 329.6 Hz |
| String | Note | Frequency |
|---|---|---|
| 4th | E1 | 41.2 Hz |
| 3rd | A1 | 55.0 Hz |
| 2nd | D2 | 73.4 Hz |
| 1st | G2 | 98.0 Hz |
| String | Note | Frequency |
|---|---|---|
| 4th | G4 | 392.0 Hz |
| 3rd | C4 | 261.6 Hz |
| 2nd | E4 | 329.6 Hz |
| 1st | A4 | 440.0 Hz |
| String | Note | Frequency |
|---|---|---|
| G | G3 | 196.0 Hz |
| D | D4 | 293.7 Hz |
| A | A4 | 440.0 Hz |
| E | E5 | 659.3 Hz |
What is a Chromatic Tuner?
A chromatic tuner detects the pitch of any note across all 12 semitones of the chromatic scale. Unlike instrument-specific tuners that only listen for the expected string notes, a chromatic tuner can detect any pitch from sub-bass to high treble. This makes it useful for any instrument, vocals, or checking specific notes for production work.
Understanding the Cents Meter
The meter shows how many cents you are sharp or flat from the target note. There are 100 cents between each semitone.
Frequently Asked Questions
Does this tuner work without downloading anything?
Yes. This is a fully browser-based tuner using the Web Audio API. It works on any modern device (phone, tablet, laptop, desktop) with a microphone and no app or plugin download. Chrome, Firefox, Safari, and Edge all support it.
Is my audio uploaded anywhere?
No. All pitch detection happens locally in your browser using the Web Audio API. Your microphone audio never leaves your device and is never sent to any server.
What is A4 = 440 Hz?
A4 = 440 Hz is the international standard pitch reference (ISO 16). The A above middle C is tuned to exactly 440 cycles per second. All other notes in equal temperament are derived from this reference. Most instruments, digital audio, and recordings use this standard.
What is a cent in music tuning?
A cent is 1/100th of a semitone. The octave has 12 semitones, each with 100 cents, for 1200 cents total per octave. When tuning, 0 cents means perfectly in tune with the reference pitch. +-10 cents is barely noticeable; +-25 cents is clearly out of tune to most listeners.