Online Guitar & Bass Tuner

Free, accurate online tuner for guitar, bass, ukulele, and other stringed instruments. Use your device's microphone to tune or play reference tones.

Click "Start Tuning" to begin
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Tuning Presets

Guitar Tunings
Bass Tunings
Ukulele Tunings

How to Use the Online Guitar Tuner

Our free online tuner makes tuning your instrument easy and accurate:

  1. Allow Microphone Access: Click "Start Tuning" and allow your browser to access your microphone when prompted.
  2. Select Your Instrument: Choose your tuning preset from the sidebar (Standard Guitar, Drop D, Bass, Ukulele, etc.).
  3. Play a String: Pluck a string on your instrument. The tuner will detect the pitch and show you the note.
  4. Tune Your String: Watch the needle and cents display. When the needle is centered and shows "In Tune", your string is perfectly tuned!
  5. Use Auto-Detect: Click the string button you want to tune, or use "Auto-Detect" mode to automatically identify which string you're playing.

Understanding the Tuner Display

The Needle: Shows how far off your string is from the target note. When centered, you're in tune!

Cents: A measurement of pitch difference. ±5 cents is generally considered in tune. Negative numbers mean you're flat (too low), positive means sharp (too high).

Color Indicators:

  • Red: Flat - Tighten the string
  • Orange: Sharp - Loosen the string
  • Green: In Tune - Perfect!

Tips for Accurate Tuning

  • Tune in a quiet environment for best results
  • Pluck strings clearly and let them ring out
  • Tune from low to high strings (thickest to thinnest)
  • Always tune up to pitch (loosen then tighten) for stability
  • After tuning all strings, go back and check them again as tension affects other strings

What Tuning Should I Use?

Standard Tuning (E A D G B E): The most common guitar tuning. Perfect for beginners and most songs.

Drop D (D A D G B E): Popular in rock and metal. Lowers the low E string to D for heavier riffs.

DADGAD: Popular in Celtic and folk music. Creates an open, droning sound.

Open G (D G D G B D): Great for slide guitar and blues. Produces a G major chord when strummed open.