FREE · AUDIO TOOLS
Online Guitar Tuner.
Tune a guitar, bass, ukulele, violin, cello, oud and more with your microphone, or tune by ear with reference notes. Chromatic mode for any note.
Play one string at a time and let it ring. The tuner picks the nearest string automatically; click a string to hear its note and tune to that string only. Headphones are not needed. Works best in a quiet room with the instrument close to the microphone.
How to use Online Guitar Tuner
Choose the instrument, press Start and allow the microphone, then play one string at a time. The needle shows how many cents you are off; click a string to hear its note and lock the target.
How it works
Pitch is found with the YIN algorithm on 4,096-sample frames with a median of recent readings; on test tones it is accurate to under 1 cent from 31 Hz to 1.3 kHz. 100 cents make a semitone.
Example
With A4 = 440 Hz, a string sounding 445 Hz reads A4 +20 cents (too high), and the open low E of a guitar should read 82.41 Hz.
Questions about Online Guitar Tuner
Is Online Guitar Tuner free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Needs a microphone and a quiet room. Very low notes (below about 30 Hz) are not detected. The sound is analysed live and never recorded or uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.