Accurate cents needle
See how many cents sharp or flat you are, with a green zone when you are within 5 cents of perfect.
Free · Uses your microphone · Nothing is recorded
Guitar Tuner Online: Tune by Ear or by Needle
Tune your guitar, bass, ukulele or violin with your microphone. The needle shows exactly how many cents sharp or flat you are, with standard, drop D and half-step-down tunings, reference tones and adjustable A4 pitch.
- Guitar, bass, ukulele, violin
- Chromatic mode
- Reference tones
- A4 from 430 to 450 Hz
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– Hz
Play a string
Allow microphone access, then pluck one string at a time.
Strings
The string you play is detected automatically. Tap a string to lock it or hear its note.
Reference pitch
Why it is different
Why this online guitar tuner is better
Many web tuners only show a note name, or push you to install an app. This one is precise, private and covers more instruments.
Eight tunings
Guitar standard, drop D, half step down and open G, plus bass, ukulele, violin and a chromatic mode for any note.
Reference tones
Tap a string to hear its correct note and tune by ear, great in noisy rooms or with a weak mic.
Custom A4 pitch
Set the reference from 430 to 450 Hz to match a piano, an orchestra or 432 Hz tuning.
Auto string detection
Pluck any string and the tuner finds it, marks it when in tune, and ignores noise between notes.
Private and free
Sound is analysed on your device and never recorded or sent anywhere. No app or sign-up needed.
How to use
How to tune your guitar online
Standard tuning takes about a minute.
Start the tuner
Press Start tuning and allow microphone access. Hold your instrument near the device.
Pick your tuning
Choose guitar standard, drop D, bass, ukulele, violin or chromatic.
Pluck one string
Let it ring. If the needle is left you are flat, so tighten. If it is right you are sharp, so loosen.
Stop in the green
When the note turns green you are within 5 cents. Repeat for every string, then check them once more.
Tunings
Standard tuning notes and frequencies
Strings are listed from the thickest to the thinnest, with A4 at 440 Hz.
| Instrument | Notes | Frequencies (Hz) |
|---|---|---|
| Guitar, standard | E2 A2 D3 G3 B3 E4 | 82.41, 110.00, 146.83, 196.00, 246.94, 329.63 |
| Guitar, drop D | D2 A2 D3 G3 B3 E4 | 73.42, 110.00, 146.83, 196.00, 246.94, 329.63 |
| Bass, 4 string | E1 A1 D2 G2 | 41.20, 55.00, 73.42, 98.00 |
| Ukulele | G4 C4 E4 A4 | 392.00, 261.63, 329.63, 440.00 |
| Violin | G3 D4 A4 E5 | 196.00, 293.66, 440.00, 659.26 |
Tips for accurate tuning
- Tune up to the note. If you are sharp, go below and come back up so the string holds.
- Pluck gently with the pad of your finger, then read the needle once the note settles.
- Keep it quiet. Background noise and other strings ringing confuse any tuner.
- Retune new strings often, since they stretch for the first few days.
What are cents?
A cent is one hundredth of a semitone. Most people cannot hear an error below about 5 cents, which is why the tuner shows green within that range. At 50 cents you are halfway to the next note.
FAQ
Guitar tuner FAQs
How do I tune my guitar with this online tuner?
Press Start tuning, allow the microphone, and pluck one string. Turn the tuning peg until the needle sits in the centre and the note turns green, then move on to the next string.
What are the notes of standard guitar tuning?
From the thickest string to the thinnest: E2, A2, D3, G3, B3 and E4. A common way to remember it is Eddie Ate Dynamite, Good Bye Eddie.
Can I tune a bass or ukulele?
Yes. Choose Bass for E A D G, or Ukulele for G C E A. There are also presets for violin and a chromatic mode for any other instrument.
Why is the tuner not detecting my guitar?
Check that the browser has microphone permission and that the level bar moves when you play. Move closer to the mic, play one string at a time and reduce background noise. Low bass notes work best with a laptop or external mic rather than a small phone speaker area.
What is drop D tuning?
Drop D lowers the thickest string from E to D, giving D A D G B E. It makes power chords easier and is popular in rock and metal.
Should I tune to 440 Hz or 432 Hz?
440 Hz is the modern standard used by most music and instruments. Use 432 Hz only if you are playing along with music tuned that way. You can set any value from 430 to 450 Hz.
Is my audio recorded?
No. The tuner analyses the sound live in your browser. Nothing is recorded, saved or uploaded, and the microphone switches off when you stop.
Does the tuner work on my phone?
Yes. It works in modern mobile browsers on Android and iPhone. Allow microphone access and hold the phone near the sound hole or amplifier.
Tune up and start playing
Pick your instrument, pluck a string and follow the needle to perfect pitch. Free, accurate and private.
Open the guitar tuner