Free chromatic tuner with real-time pitch detection. Tune your guitar, bass, ukulele, or any instrument using your microphone.
This online guitar tuner is a browser-based tuning tool that detects pitch through your device’s microphone and converts it into musical notes and frequency values in hertz (Hz). It allows users to tune acoustic guitars, electric guitars, bass guitars, and extended-range guitars without installing any app, plugin, or software.
The tool works as a free guitar tuner online and supports standard tuning, chromatic tuning, half-step and full-step tuning, drop tunings, and custom reference pitch calibration such as 440 Hz, 432 Hz, 444 Hz, and 425 Hz. It is designed for practice, learning, and general instrument setup rather than stage-grade strobe tuning.
An online guitar tuner is used by beginner guitar players, intermediate musicians, teachers, students, home recordists, and multi-instrument players who need fast pitch reference without dedicated hardware. It is commonly used for daily practice, lesson preparation, string changes, alternate tuning checks, and rough intonation alignment.
Because the tuner is chromatic, it is also used as a pitch tuner online for bass guitar, ukulele, violin, mandolin, and other string instruments that rely on note-to-frequency accuracy.
The tuner listens to incoming audio through the microphone and performs real-time pitch detection. The detected frequency is mapped to the nearest musical note using equal temperament tuning. The interface displays whether the pitch is flat, sharp, or centered, allowing users to adjust string tension accurately.
This process functions as a note-to-frequency and frequency-to-note converter optimized for live instrument input rather than audio file analysis.
Standard tuning for 6-string guitar follows the sequence: E2 – A2 – D3 – G3 – B3 – E4. This is the default tuning reference used in most guitar music, lessons, and chord charts.
Chromatic mode allows the tuner to detect any musical note without restricting detection to predefined string names. This mode is required for non-standard tunings, alternate instruments, and intonation checks.
The tuner accesses your device microphone only during active use. Plucked strings generate sound waves that are captured as time-domain audio signals for analysis.
The audio signal is converted into a fundamental frequency value in hertz. This value is compared against standardized note frequency tables to determine the closest note and pitch deviation in cents.
The tuning indicator shows real-time deviation. A centered indicator means the note is in tune. Movement to the left indicates flat pitch, while movement to the right indicates sharp pitch.
An online guitar tuner converts detected pitch into a musical note using the equal temperament tuning system. Each note is mapped to a frequency value relative to a reference pitch, commonly A4 = 440 Hz.
Frequency Formula:
f = 440 × 2(n − 69) / 12
The tuner detects the fundamental frequency from the microphone, converts it into a MIDI-equivalent value, and calculates pitch deviation in cents to determine whether the string is flat, sharp, or in tune.
| String | Note | Octave | Frequency (Hz) | MIDI Number |
|---|---|---|---|---|
| 6th (Low) | E | 2 | 82.41 | 40 |
| 5th | A | 2 | 110.00 | 45 |
| 4th | D | 3 | 146.83 | 50 |
| 3rd | G | 3 | 196.00 | 55 |
| 2nd | B | 3 | 246.94 | 59 |
| 1st (High) | E | 4 | 329.63 | 64 |
This table represents standard 6-string guitar tuning using A4 = 440 Hz. Alternate tunings shift frequencies proportionally based on reference pitch calibration.
Online guitar tuners prioritize accessibility and convenience. Hardware pedal tuners and strobe tuners offer higher precision for live performance, while DAW plugins provide tuning accuracy within recording workflows. Browser-based tuners remain suitable for practice and general setup.