Guitar Tuner with Real-Time Pitch Detection
This online guitar tuner uses your device microphone to detect pitch in real time and shows exactly how sharp or flat each string is. A visual gauge and clear status make tuning quick, even if you have never used a tuner before.
It works for acoustic guitar, electric guitar, bass, and ukulele, with standard EADGBE plus alternate tunings such as Drop D, Half Step Down, and open tunings. There is nothing to install — open the page, allow the microphone, and start tuning.
How to Tune Your Guitar
Enable your microphone
Click Enable Microphone and allow browser access when prompted. The tuner needs live microphone input to hear the pitch of your strings.
Select instrument and tuning
Choose Guitar, Bass, or Ukulele, then pick a tuning. Standard tuning is selected by default.
Play one string
Pluck a single string. The tuner shows the detected note and octave (for example E2 or A4), the deviation in cents, and a needle on the gauge.
Adjust until it is green
Follow the gauge: red at the edges means far off, yellow means close, and green means in tune. The status tells you to tune up if flat or down if sharp.
Move to the next string
Within 5 cents the string is marked in tune with a green border. Move on and repeat until every string is set. Tap a Reference Tone button anytime to hear the target pitch and tune by ear.
Features
Real-Time Pitch Detection
The YIN algorithm analyzes microphone audio live, detecting pitches from 50 Hz to 1200 Hz across guitar, bass, and ukulele strings.
Visual Tuning Gauge
A semi-circular gauge with a smooth needle shows how many cents sharp or flat you are at a glance.
Color-Coded Feedback
Green means in tune, yellow means close, and red means far off, so you always know which way to turn the peg.
Three Instruments
Tune 6-string guitar, 4-string bass, or 4-string ukulele, each with its own set of tuning presets.
Alternate Tunings
Guitar adds Drop D, Half Step Down, Open G, Open D, and DADGAD; bass adds Drop D; ukulele adds Low G and Baritone.
Auto String Detection
Play any string and the tuner identifies which one it is from the detected frequency — no need to select it first.
Reference Tones
Each string has a button that plays a pure sine wave at the target pitch, useful for tuning by ear or in noisy rooms.
Adjustable A4 Reference
The default concert pitch is A4 = 440 Hz, adjustable from 430 Hz to 450 Hz, with all string targets updating automatically.
Frequently Asked Questions
How do I tune a guitar online with my microphone?
Click Enable Microphone and allow access, pick your instrument and tuning, then pluck one string. The tuner detects the pitch and shows whether the string is sharp or flat. Adjust until the gauge turns green.
What are the standard guitar string notes?
Standard tuning from the lowest (thickest) string to the highest is E A D G B E — that is E2, A2, D3, G3, B3, E4. This is the tuning selected by default when you choose Guitar.
In what order should I tune the strings?
A common approach is to start from the lowest string (6th, E2) and work up to the highest (1st, E4). Because the tuner auto-detects which string you play, you can also tune them in any order. Within 5 cents a string is marked in tune with a green border.
Why will not the tuner detect my microphone?
Make sure your browser has microphone permission enabled for this page. Play strings one at a time, close to the mic, and reduce background noise — loud rooms and overlapping strings interfere with pitch detection.
Can I tune an electric guitar or bass with this?
Yes. The tuner listens through your microphone, so play your electric guitar through an amp or acoustically near the mic. Bass is fully supported with its own Standard and Drop D tunings.
How accurate is this online tuner?
It uses the YIN pitch detection algorithm, which is accurate to within a couple of cents under good conditions. For the cleanest reading, pluck a single string clearly and keep background noise low.
What does "cents" mean on the display?
A cent is a unit of pitch where one semitone equals 100 cents. +10 cents means the string is slightly sharp and -10 cents means slightly flat. Aim for 0; within 5 cents counts as in tune.
What is A4 = 440 Hz and can I change it?
A4 = 440 Hz is the international standard for concert pitch — the A above middle C. Some ensembles tune slightly differently, so you can adjust the A4 reference from 430 Hz to 450 Hz and every string target recalculates automatically.
Can I use this tuner on my phone?
Yes. It runs in any modern mobile browser with a microphone, including Chrome, Safari, and Firefox, since they all support the Web Audio API the tuner relies on.
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