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Free Online Chromatic Tuner

Tune any instrument instantly using your microphone. Accurate to ±1 cent. No download or sign-up required.

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Frequency: — HzCents: —
♭ FlatIn Tune♯ Sharp
Click Start to begin tuning
Metronome
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BPM Tapper
Find song tempo
Virtual Guitar
Play & learn
Virtual Piano
Play any song

Free Online Chromatic Tuner — Tune Any Instrument Instantly

Our free online chromatic tuner is the fastest and easiest way to tune your guitar, bass, ukulele, violin, or any other instrument directly in your web browser. Using your device's microphone and the Web Audio API, the tuner detects the pitch of any note you play with remarkable accuracy — no app download, no sign-up, and no cost.

How to Use the Online Tuner

Using the tuner is straightforward. Click the Start Tuning button and allow microphone access when your browser prompts you. Once active, play a single note on your instrument and watch the display. The large note name shows what pitch the tuner is detecting, the frequency readout gives you the exact Hz value, and the needle indicator shows whether you're flat (too low), sharp (too high), or perfectly in tune.

To tune a guitar string, pluck it cleanly and hold steady while the needle settles. If the needle drifts left of center, tighten the tuning peg slightly. If it drifts right, loosen it. Keep adjusting and re-plucking until the needle centers and the display turns green.

Guitar Mode — Standard Tuning (EADGBE)

Switch to Guitar mode to see a visual guide for standard EADGBE tuning. Starting with the low E string (string 6, the thickest), tune each string in sequence: E – A – D – G – B – E. This is the most common tuning for acoustic and electric guitar. Our chromatic mode also supports alternate tunings like Drop D (DADGBE), Open G (DGDGBD), and DADGAD — simply play the target note and tune to match.

Bass Guitar Tuner (EADG)

Bass players can use the same chromatic tuner to hit standard EADG tuning. The four strings of a standard bass guitar are tuned: E1 – A1 – D2 – G2 (one octave below the lowest four strings of a guitar). Select Bass mode to see the string labels, then pluck each string and follow the needle to perfect pitch.

Ukulele Tuning (GCEA)

Ukuleles use a non-standard re-entrant tuning where the G string is higher than expected. Standard soprano, concert, and tenor ukulele tuning is G4 – C4 – E4 – A4. Select Ukulele mode to see these targets displayed. Pluck each string and use the tuner to match the target frequency precisely.

Why Use an Online Tuner Instead of a Physical Clip-On?

While clip-on tuners are great for live performances, browser-based tuners offer unique advantages. They're always with you as long as you have a phone or computer — no battery to die, no device to lose. They're also free, updated automatically, and work for any instrument that can produce a sound your microphone can pick up, making them ideal for home practice sessions.

FAQ

Online Tuner — Frequently Asked Questions

Is this online tuner accurate enough for real instruments?
Yes. Our tuner uses the Web Audio API's AnalyserNode with autocorrelation pitch detection to achieve ±1 cent accuracy — sufficient for standard guitar, bass, violin, and wind instrument tuning.
Do I need to install anything to use the online tuner?
No installation required. The tuner runs entirely in your browser using the WebAudio API and MediaDevices API. Simply allow microphone access when prompted and you're ready to tune.
Which browsers support the online tuner?
Chrome, Firefox, Edge, and Safari (version 14+) all support the Web Audio API needed for our tuner. We recommend Chrome for the best performance.
Can I tune a guitar using this free online tuner?
Absolutely. Select 'Guitar' mode and our tuner will listen for the standard EADGBE strings. Play each string one at a time and the needle will show whether you're flat, sharp, or in tune.
Does the tuner work on mobile phones and tablets?
Yes, our chromatic tuner is fully mobile-responsive. On iOS and Android, allow microphone access and the tuner will work just like on desktop — ideal for tuning on the go.
What does 'cents' mean on a tuner?
A cent is 1/100th of a semitone. When the tuner shows +5 cents, your instrument is slightly sharp (too high). At -5 cents it's slightly flat (too low). Zero cents means perfectly in tune.
Can I use this to tune a ukulele, violin, or bass?
Yes! Switch to 'Chromatic' mode to detect any note across all instruments. For guitar-specific or ukulele-specific modes with labeled strings, use the instrument selector at the top.
Why isn't my microphone being detected?
Make sure you've clicked 'Allow' on the browser's microphone permission popup. If you previously denied it, go to your browser settings (the lock icon in the address bar) and reset microphone permissions.
How do I get the most accurate tuning results?
Tune in a quiet environment to prevent background noise from confusing the pitch detector. Play one note at a time and hold it steady. Plucked strings are easier to detect than bowed or sustained notes.
Is this tuner free to use?
Yes, completely free. No account required, no ads on the tuner itself, and no time limits. Use it as often as you need.