SnapRhythm Guitar Tuner is a free online tuner that runs in your browser — no install required. Your microphone picks up each string and shows real-time pitch in Hz against standard tuning (E2·A2·D3·G3·B3·E4) and 7 presets including Drop D and Open G.
Tap the button to start
We use your microphone to hear the guitar. No audio is recorded — only real-time frequency analysis.
Done tuning?
The tuner listens through your mic, computes the pitch in Hz in real time, and matches each string against standard tuning (E2-A2-D3-G3-B3-E4) or 7 presets including Drop D and Open G. The A4 reference is adjustable from 415 to 466 Hz, so it works for orchestra pitch or playing with older pianos. Runs in the browser on mobile or desktop — no install.
How to Use the Guitar Tuner — 4 Steps
The online guitar tuner runs in your browser with no install. Even first-timers can tune in the 4 steps below.
- Tap the Start Tuning button to activate the microphone.
- Pluck each guitar string one at a time.
- Adjust the string while watching the meter to center it.
- Green indicates the string is accurately tuned.
Guitar mode quickly detects the six standard strings (E·A·D·G·B·E); switch to chromatic mode for alternate tunings or other instruments.
Tuning Tips
- Tuning in a quiet environment can improve measurement accuracy on mic-based tuners.
- Wait for the sound to stabilize after plucking.
- When possible, approach the target pitch from below (helps compensate for slight peg slippage).
- New strings tend to stretch, so retune a few times.
Standard Tuning (E A D G B E)
Standard guitar tuning from the 6th string (thickest) is E2, A2, D3, G3, B3, E4.
| String | Note | Frequency |
|---|---|---|
| 1 | E4 | 329.63 Hz |
| 2 | B3 | 246.94 Hz |
| 3 | G3 | 196.00 Hz |
| 4 | D3 | 146.83 Hz |
| 5 | A2 | 110.00 Hz |
| 6 | E2 | 82.41 Hz |
What is a Chromatic Tuner?
A chromatic tuner detects all 12 semitones (C, C#, D, D#, E, F, F#, G, G#, A, A#, B). Unlike a standard guitar tuner that only recognizes the 6 open string notes, a chromatic tuner identifies any pitch and shows the closest note name.
This is especially useful for alternate tunings (Drop D, Open G, etc.) where you need to tune to notes outside the standard set. It also works for other instruments like ukulele, violin, or bass.
SnapRhythm supports both guitar mode (auto-detect) and chromatic mode. In guitar mode, it automatically finds the closest standard tuning note. In chromatic mode, it shows your current pitch across all 12 notes.
Reference Pitch (Hz) Adjustment Guide
The reference pitch is the frequency of the A4 note. The international standard is A4 = 440Hz, and most instruments and recordings use this as the baseline.
However, 440Hz isn't universal. Orchestras often tune slightly higher at 441-443Hz for a brighter sound, while baroque music performances may use 415Hz. When playing with other musicians, you might need to match their reference pitch.
To change the reference pitch in SnapRhythm, use the 'Reference Pitch' slider at the top of the tuner. You can adjust it up or down from 440Hz, and the reset button will bring it back to 440Hz anytime.
Guitar Tuning Notes Explained
Want each string's note name and its solfege (Do-Re-Mi) equivalent? See the guitar tuning guide for the full table of string names, notes, frequencies, and octaves.
Frequently Asked Questions
How accurate is an online tuner?
Accuracy depends on microphone quality, background noise, and signal stability. We recommend tuning in a quiet environment. We don't claim a specific cent-level accuracy guarantee, but for typical practice tuning the result is generally usable.
What do the numbers in E2, A2 mean?
The numbers represent the octave. E2 means E in the 2nd octave, E4 means E in the 4th octave. Higher numbers = higher pitch. The 6th string E2 (82.41Hz) and 1st string E4 (329.63Hz) are the same note 'E' but two octaves apart.
What's the difference between chromatic and guitar mode?
Guitar mode only detects the 6 standard tuning notes (E, A, D, G, B, E) and automatically finds the closest string — great for quick tuning. Chromatic mode detects all 12 notes, making it suitable for alternate tunings and other instruments.
Do I need a microphone to use the guitar tuner?
Yes — detecting string sound requires microphone permission. Allow it when your browser asks. If you blocked it by mistake, re-enable the microphone from the lock icon in the address bar. If you can't use a mic, you can also tune by matching the reference notes in the standard tuning table.
What should I do if the microphone doesn't pick up the sound?
Reduce background noise and pluck the string closer to the mic. If another app is using the microphone, close it, reload the page, and grant permission again — that resolves most cases. On mobile, also check the microphone permission in your browser settings.
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