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Guitar & Instrument Tuner
Tune a guitar, bass, ukulele or violin with your microphone, or tune chromatically.
Free tools that run in your browser. Nothing you type, open or create is uploaded to NerdBible or anyone else.
Press Start and allow the microphone.
Your microphone is analysed live in this tab only. Nothing is recorded, stored or uploaded, and the microphone closes when you press Stop or leave the page. For the best reading, play one string at a time, close to the microphone, in a quiet room.
How to use it
- Choose your instrument, or Chromatic for any note.
- Press Start and allow the microphone when your browser asks.
- Play one string and let it ring. Tighten the string if the needle sits left of centre (flat), loosen it if it sits right (sharp), until it turns green.
Questions
Why does the tuner show nothing?
It ignores quiet sound so the needle does not wander in silence. Play the string a little harder or move closer to the microphone. If it still shows nothing, check the browser has permission to use the microphone and that the right microphone is selected in your system settings.
What does cents mean?
A cent is a hundredth of a semitone. Within about 5 cents most people cannot hear a difference, which is when the display turns green.
When would I change the reference A4?
Most music today is tuned to A4 = 440 Hz. Some orchestras tune a little higher, around 442 Hz, and baroque ensembles often use 415 Hz. Match the reference to the band or recording you play with.
How do the reference buttons help?
Each string button plays its target note, so you can tune by ear, or check the microphone is picking up the right string.
About this tool
About the online tuner
This tuner listens through your device's microphone, works out the pitch of the note you play, and shows how far it is from the target. Choose your instrument for standard string-by-string tuning, or Chromatic to tune any note on any instrument, including voice and wind.
How to tune
- Choose the instrument and press Start, then allow the microphone.
- Play one string and let it ring.
- If the needle sits left of centre the note is flat: tighten the string. If it sits right, it is sharp: loosen it.
- When it turns green you are within about 5 cents, closer than most people can hear.
A cent is a hundredth of a semitone. Each string button also plays its target note, so you can tune by ear or check the microphone is hearing the right string.
Reference pitch
Most music today uses A4 = 440 Hz. Some orchestras tune around 442 Hz, and baroque ensembles often use 415 Hz. Match the reference to the band or recording you play with.
If nothing shows
The tuner ignores quiet sound so the needle does not wander in silence. Play a little harder, move closer to the microphone, and check the browser has permission to use it. A quiet room helps.
Sound is analysed live in this tab only. Nothing is recorded, stored or uploaded, and the microphone closes when you press Stop or leave the page.
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