Free Online Guitar Tuner
Standard guitar tuning, free. No signup, nothing to install. Chromatic detection reads any instrument by note name; per-string references for bass, ukulele, 7- and 12-string and more come with Explorer. Also try our Metronome.
How to use it ↓Detect pitch from your microphone in real time. Works for any instrument: guitar, bass, violin, voice, and more.
Bass, ukulele, baritone, 7- and 12-string guitar, plus alternate tunings including Drop D, Drop C, DADGAD and Open G/D/E/C. Save your own custom tunings, shift the reference pitch for A=432 or A=438, and switch on a 0.1-cent precision readout.
Get Explorer · $9.99/yrHow to Tune a Guitar with This Tuner
Standard guitar tuning is E A D G B E, from the lowest (thickest) string to the highest. Press Start Tuning, allow microphone access, and work one string at a time:
- Get the instrument close to the microphone. Around 30–60 cm from a laptop mic is usually right. On a phone, resting it on the guitar body works well.
- Play the low E string (6th) cleanly and let it ring. The display should settle on E2.
- Read the needle. Left of centre means flat: tighten the peg. Right means sharp: loosen it.
- Move in small increments. Large peg turns overshoot easily. Let the note ring again after each adjustment.
- Finish from below. Tune up to the target rather than down to it, then repeat for A2, D3, G3, B3 and E4.
When you overshoot and come back down, the string is left with uneven tension across the nut and tuning post, and it drifts flat as you play. Approaching the target from below leaves the tension settled and the tuning far more stable.
Reading the Display
The tuner shows three things: the detected note, its octave, and the cents deviation from that note's exact pitch. A cent is 1/100th of a semitone, fine enough that a few cents either way is inaudible on its own, but obvious when two instruments play together.
Within ±5 cents counts as in tune for most playing, and the readout turns green there. Past about ±10 cents you will hear it against other instruments. Precision mode tightens that window to ±1 cent for intonation work.
A display flickering between two note names means the pitch is sitting between them; keep adjusting. A blank display means the signal is too quiet or the room is too noisy for a clean reading.
Guitar & Bass Tuning Chart
Every tuning built into this tuner (guitars, basses, orchestral strings and folk instruments) with the note for each string and its frequency at the A = 440 Hz standard. Strings are listed lowest-numbered last, so a six-string guitar reads from the 6th string to the 1st.
| Tuning | Notes (low to high) | Frequencies (Hz) |
|---|---|---|
| Guitar (6-string) | ||
| Standard | E2 A2 D3 G3 B3 E4 | 82.41 · 110.00 · 146.83 · 196.00 · 246.94 · 329.63 |
| Drop D | D2 A2 D3 G3 B3 E4 | 73.42 · 110.00 · 146.83 · 196.00 · 246.94 · 329.63 |
| Drop C | C2 G2 C3 F3 A3 D4 | 65.41 · 98.00 · 130.81 · 174.61 · 220.00 · 293.66 |
| Half Step Down | E♭2 A♭2 D♭3 G♭3 B♭3 E♭4 | 77.78 · 103.83 · 138.59 · 185.00 · 233.08 · 311.13 |
| Whole Step Down | D2 G2 C3 F3 A3 D4 | 73.42 · 98.00 · 130.81 · 174.61 · 220.00 · 293.66 |
| DADGAD | D2 A2 D3 G3 A3 D4 | 73.42 · 110.00 · 146.83 · 196.00 · 220.00 · 293.66 |
| Open G | D2 G2 D3 G3 B3 D4 | 73.42 · 98.00 · 146.83 · 196.00 · 246.94 · 293.66 |
| Open D | D2 A2 D3 F#3 A3 D4 | 73.42 · 110.00 · 146.83 · 185.00 · 220.00 · 293.66 |
| Open E | E2 B2 E3 G#3 B3 E4 | 82.41 · 123.47 · 164.81 · 207.65 · 246.94 · 329.63 |
| Open C | C2 G2 C3 G3 C4 E4 | 65.41 · 98.00 · 130.81 · 196.00 · 261.63 · 329.63 |
| Drop B | B1 F#2 B2 E3 G#3 C#4 | 61.74 · 92.50 · 123.47 · 164.81 · 207.65 · 277.18 |
| Guitar (7-string) | ||
| Standard | B1 E2 A2 D3 G3 B3 E4 | 61.74 · 82.41 · 110.00 · 146.83 · 196.00 · 246.94 · 329.63 |
| Drop A | A1 E2 A2 D3 G3 B3 E4 | 55.00 · 82.41 · 110.00 · 146.83 · 196.00 · 246.94 · 329.63 |
| Guitar (8-string) | ||
| Standard | F#1 B1 E2 A2 D3 G3 B3 E4 | 46.25 · 61.74 · 82.41 · 110.00 · 146.83 · 196.00 · 246.94 · 329.63 |
| Guitar (12-string) | ||
| Standard | E2 E3 A2 A3 D3 D4 G3 G4 B3 B3 E4 E4 | 82.41 · 164.81 · 110.00 · 220.00 · 146.83 · 293.66 · 196.00 · 392.00 · 246.94 · 246.94 · 329.63 · 329.63 |
| Baritone Guitar | ||
| B Standard | B1 E2 A2 D3 F#3 B3 | 61.74 · 82.41 · 110.00 · 146.83 · 185.00 · 246.94 |
| A Standard | A1 D2 G2 C3 E3 A3 | 55.00 · 73.42 · 98.00 · 130.81 · 164.81 · 220.00 |
| Bass (4-string) | ||
| Standard | E1 A1 D2 G2 | 41.20 · 55.00 · 73.42 · 98.00 |
| Drop D | D1 A1 D2 G2 | 36.71 · 55.00 · 73.42 · 98.00 |
| Half Step Down | E♭1 A♭1 D♭2 G♭2 | 38.89 · 51.91 · 69.30 · 92.50 |
| Bass (5-string) | ||
| Standard | B0 E1 A1 D2 G2 | 30.87 · 41.20 · 55.00 · 73.42 · 98.00 |
| Bass (6-string) | ||
| Standard | B0 E1 A1 D2 G2 C3 | 30.87 · 41.20 · 55.00 · 73.42 · 98.00 · 130.81 |
| Tenor Guitar | ||
| Standard | C3 G3 D4 A4 | 130.81 · 196.00 · 293.66 · 440.00 |
| Chicago | D3 G3 B3 E4 | 146.83 · 196.00 · 246.94 · 329.63 |
| Violin | ||
| Standard | G3 D4 A4 E5 | 196.00 · 293.66 · 440.00 · 659.26 |
| Viola | ||
| Standard | C3 G3 D4 A4 | 130.81 · 196.00 · 293.66 · 440.00 |
| Cello | ||
| Standard | C2 G2 D3 A3 | 65.41 · 98.00 · 146.83 · 220.00 |
| Double Bass | ||
| Standard | E1 A1 D2 G2 | 41.20 · 55.00 · 73.42 · 98.00 |
| Mandolin | ||
| Standard | G3 D4 A4 E5 | 196.00 · 293.66 · 440.00 · 659.26 |
| Banjo (5-string) | ||
| Open G | G4 D3 G3 B3 D4 | 392.00 · 146.83 · 196.00 · 246.94 · 293.66 |
| Double C | G4 C3 G3 C4 D4 | 392.00 · 130.81 · 196.00 · 261.63 · 293.66 |
| Sawmill / G Modal | G4 D3 G3 C4 D4 | 392.00 · 146.83 · 196.00 · 261.63 · 293.66 |
| Tenor Banjo | ||
| Standard | C3 G3 D4 A4 | 130.81 · 196.00 · 293.66 · 440.00 |
| Irish | G2 D3 A3 E4 | 98.00 · 146.83 · 220.00 · 329.63 |
| Irish Bouzouki | ||
| GDAD | G2 D3 A3 D4 | 98.00 · 146.83 · 220.00 · 293.66 |
| GDAE | G2 D3 A3 E4 | 98.00 · 146.83 · 220.00 · 329.63 |
| Ukulele | ||
| Standard | G4 C4 E4 A4 | 392.00 · 261.63 · 329.63 · 440.00 |
| Low G | G3 C4 E4 A4 | 196.00 · 261.63 · 329.63 · 440.00 |
| Baritone | D3 G3 B3 E4 | 146.83 · 196.00 · 246.94 · 329.63 |
On a 12-string, the lower four courses are octave pairs and the top two are unison pairs, which is why E2 and E3 both appear on the 6th course.
Tuning Bass, Ukulele and Other Instruments
These presets are part of Explorer; the chromatic readout below works for them on any tier. Bass guitar uses E A D G, the same letters as a guitar's bottom four strings but an octave lower. The low E sits around 41 Hz, and low notes take longer to analyse than high ones; play firmly and hold the note for a moment longer than you would on guitar.
Ukulele standard tuning is G C E A, and it catches people out: the 4th string is a high G (G4), above the 3rd string's C4. That is called re-entrant tuning. If you would rather have it run low to high, the Low G option drops that string to G3.
Voice works too. Sustain a note and the tuner names it, which makes it a useful way to find a starting pitch a cappella, or to practise holding a note dead centre.
How the Pitch Detection Works
The tuner captures a live stream from your microphone through the Web Audio API and analyses it with autocorrelation: it compares the waveform against time-shifted copies of itself and finds the shift at which the signal best matches. That shift is the period of the waveform, and the frequency is simply the sample rate divided by it.
A parabolic fit around the best match refines the result to a fraction of a sample, which is what makes sub-cent resolution possible. The frequency is then mapped to the nearest note in twelve-tone equal temperament relative to your reference pitch, and the difference is reported in cents.
The tool also gates on signal strength: if the incoming level is below a threshold, it reports nothing rather than guessing at noise. That is why the display goes blank in a quiet room rather than jumping between random notes.
Everything runs locally in your browser. The audio is analysed and discarded frame by frame; nothing is recorded, uploaded or stored.
Tuning in a Noisy Room
Microphone tuning is only as good as the signal reaching the mic. In a loud rehearsal space the tuner may lock onto a kick drum instead of your string. Three things help:
- Close the distance. Your instrument needs to dominate the room, so move the mic to the instrument rather than the other way round.
- Play into the gaps. Wait for a lull, pluck firmly, and read the display where it settles rather than while it is jumping.
- Use a clip-on tuner on stage. Contact tuners read string vibration directly and ignore the room entirely. A browser tuner is for practice and studio setup; verify at soundcheck with hardware.
Reference Pitch: A=440, A=432 and A=438
Everything above assumes A4 = 440 Hz, the international standard since it was set as ISO 16 in 1955. Every note the tuner reports is derived from that anchor, so changing it shifts the whole instrument rather than just the readout.
There are real reasons to move it. Ensembles playing with period instruments often tune lower; some European orchestras sit at 442 or 443; players who want a slightly slacker feel drop to 432. Historically, pitch varied widely by city and era before standardisation. If you have seen claims that 432 Hz has particular health or resonance properties, those are not supported by evidence, but as a musical preference it is a perfectly legitimate choice, and the tuner supports anything from 420 to 460 Hz.
Frequently Asked Questions
Is this guitar tuner free?
Standard guitar tuning is free, with no account required: that includes the chromatic detection, the note and cents readout, and the six-string reference. Every other preset (bass, ukulele, 7- and 12-string, baritone, and alternate tunings like Drop D and DADGAD), plus custom tunings, reference pitch and precision mode, is part of the Explorer tier at $9.99/yr.
Do I need to install anything?
No. It runs in the browser and only needs permission to use your microphone. Nothing is downloaded, and no audio leaves your device.
How accurate is an online tuner?
The detection resolves to a fraction of a cent, and precision mode displays to 0.1 of a cent. In practice your accuracy is limited by the microphone and the room rather than the algorithm; with a quiet space and a clean signal it is comfortably accurate enough for studio work.
Why is the tuner not detecting my guitar?
Usually one of three things: microphone permission was denied (check your browser's site settings for titanaudio.io), the instrument is too far from the mic, or the room is too noisy and the signal gate is suppressing an unreliable reading. Move closer and play a single string firmly.
What is Drop D tuning?
Drop D is standard tuning with the lowest string dropped a whole step from E2 to D2, giving D A D G B E. It puts a power chord under one finger on the bottom three strings, which is why it is so common in rock and metal.
What does “cents” mean on a tuner?
A cent is one hundredth of a semitone, so there are 1,200 cents in an octave. It is a ratio rather than a fixed number of hertz, which is what lets the same ±5 cent tolerance apply equally to a low bass string and a high harmonic.
Can I tune a bass, ukulele or violin with it?
Detection is chromatic, so it names any pitch you play on any instrument; that part is free. What Explorer adds is the per-string reference that shows you the target note and frequency for each string, which covers bass, ukulele, baritone and the 7- and 12-string guitars.
Can I save my own tunings?
Yes, on the Explorer tier. Set each string to whatever note you want, name it, and it is saved to your account and synced to every device you sign in on, available from the tuning menu whenever you come back.