A practical tuner that runs in your browser
Simple Guitar Tuner is a free browser-based guitar tuner for standard tuning, Drop D, DADGAD, open tunings, alternate reference pitches, and other common setups. The goal is simple: choose a preset, tap Start, pluck one string, and follow the meter.
How microphone tuning works
After you grant microphone permission, the tuner measures the pitch of the sound reaching your device and compares it with the selected string targets. Pitch analysis happens locally in your browser; the site does not record, save, or upload your microphone audio.
How the guides are maintained
Tuning pages include note sequences, target frequencies, and practical setup guidance. Frequencies are calculated with twelve-tone equal temperament, normally using A4 = 440 Hz unless a page clearly states another reference. Content is reviewed for consistency as new tunings and guides are added.
Corrections and feedback
If you find an unclear instruction, incorrect frequency, broken link, or accessibility problem, please send a correction or suggestion. Product links never change the price you pay; read the affiliate disclosure for details.
Who maintains this site?
Online Guitar Tuner is an independent guitar-tuning website. Its code and publishing history are maintained in the public noahbsark/guitar-tuner repository. You can report a problem through the contact page or inspect the implementation in the repository.
Our editorial approach
Guides aim to answer a specific practical question: which note to tune to, how to read the display, or how to diagnose a tuning problem. Code and writing may be developed with AI assistance. Explanations should be checked against the implementation, reproducible calculations, and relevant primary documentation. Manufacturer guidance is linked when discussing string specifications; browser documentation is linked for microphone permissions.
Worked examples are labeled as examples. A product recommendation is not a claim that we personally tested that product. Software checks use generated signals and do not establish accuracy for a particular phone, microphone, room, or guitar. Read what our software checks cover.
Corrections are welcome. Include the page address, the statement you believe is incorrect, and a source or reproducible example. Changes that affect instructions or calculations should be reflected in the relevant page, rather than changing a date alone.