How to use the Guitar Tuner
- Press Start tuner and allow your microphone.
- Play one string at a time and let it ring.
- If the needle is left of center, tighten the string. If it’s right, loosen it.
- Stop when the needle is centered and the note turns green.
Standard guitar tuning
| String | Note | Frequency |
|---|---|---|
| 6 (thickest) | E2 | 82.41 Hz |
| 5 | A2 | 110.00 Hz |
| 4 | D3 | 146.83 Hz |
| 3 | G3 | 196.00 Hz |
| 2 | B3 | 246.94 Hz |
| 1 (thinnest) | E4 | 329.63 Hz |
Tips for accurate tuning
- Tune up to the note. If you’re sharp, drop below it and come back up. This helps the string hold its pitch.
- Pluck gently and wait a moment, since notes ring sharp right after you pluck.
- Check twice. Tuning one string shifts the neck tension slightly.
Practice in time with the Metronome.
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Tools that pair well with the Guitar Tuner
- Tone Generator — Play a pure tone at any frequency from 20 Hz to 20,000 Hz — sine, square, sawtooth or triangle — for testing speakers, tuning, hearing checks or science classes.
- Mic Test — Check that your microphone works and sounds right before a call, stream or recording — see the live level, watch the waveform and play back a short test recording.
- Speaker Test — Check that your speakers or headphones work and are wired the right way round: play a tone or voice in the left, right or both channels, then test bass and phase.
- Hearing Test — Put on headphones and find the quietest tone you can hear in each ear, from low to high frequencies.
Frequently asked questions
Is my microphone recorded?
No. The sound is analyzed in your browser and never leaves your device.
Why is the tuner not picking up my guitar?
Check that the browser has microphone permission, move closer to the mic and play one string at a time. Low strings can be hard for phone and laptop mics, so try plucking a little harder.
What does A4 = 440 mean?
It sets the reference pitch. 440 Hz is the modern standard, and you only need to change it to match a recording or another instrument.
Can I tune an electric guitar?
Yes. Play near the mic with the amp on, or plug into an audio interface and select it as your browser’s microphone.
Can I install Guitar Tuner as a web app and use it offline?
Yes. Guitar Tuner is an installable web app (PWA) — installed from your browser, not downloaded from an app store. Click Install app at the top of this page in Chrome or Edge (Windows, macOS, Linux, ChromeOS) or on Android, use Share → Add to Home Screen on iPhone and iPad, or File → Add to Dock in Safari 17+ on a Mac. It then opens in its own window with its own icon, and because it runs entirely in your browser it keeps working offline. Firefox on desktop can’t install web apps. How installing works.