Guitar Tuner
Chromatic tuner with microphone detection, 11 tuning presets, and reference tones.
Free & unlimitedWorks offline
Microphone access needed
This tool reads your microphone to detect guitar string pitch. Audio is processed locally in your browser — nothing is uploaded.
Your audio stays in your browser. Nothing is uploaded.
All processing happens in your browser. No data is sent to any server.
About this tool
- 1
Allow microphone access
Click "Allow" when your browser asks for microphone permission so the tuner can hear your guitar.
- 2
Play an open string
Pluck one string at a time and let it ring clearly without muting other strings.
- 3
Read the tuner display
The detected note and cents offset appear on screen - aim for the needle to be centered at 0 cents.
- 4
Adjust and repeat
Tighten or loosen the tuning peg until the indicator is green and centered, then move to the next string.
- Tune in a quiet room - background noise confuses pitch detection.
- Pluck the string gently near the 12th fret for the clearest fundamental tone.
- Always tune up to pitch rather than down - this keeps tension on the tuning peg and holds tune longer.
- If you use a capo, tune without it first, then place the capo and fine-tune.
- Real-time chromatic pitch detection via your device microphone
- Standard tuning (EADGBE) and alternate tuning presets (Drop D, Open G, DADGAD, and more)
- Visual needle meter with cents-offset display
- Note name and octave detection for any instrument
- Works on acoustic and electric guitar through a microphone or audio interface
- Quickly tune your guitar before practice or a live performance
- Set up alternate tunings like Drop D or Open G for specific songs
- Tune a ukulele, bass, or banjo using chromatic mode
- Verify intonation by checking pitch at the 12th fret harmonic
Make sure you have granted microphone permission in your browser. Move closer to the mic, reduce background noise, and pluck the string firmly.
Yes. Plug into an audio interface and select it as your input, or simply hold the guitar near your laptop microphone.
A cent is 1/100 of a semitone. A reading of 0 cents means the note is perfectly in tune. Most people cannot hear a difference within plus or minus 5 cents.