Which instruments does Tuner Free support?

Tuner Free supports Guitar (Standard and Drop D), Violin, Bass, Ukulele, Cello, and Thai classical instruments including ซออู้ (Sao U), ซอด้วง (Sao Duang), and ซอสามสาย (Sao Sam Sai). It also has a chromatic mode for any other instrument.

How accurate is Tuner Free?

Tuner Free uses the Pitchy pitch detection algorithm which provides accuracy within 1 cent. It also shows a stability chart so you can track how stable your pitch is over time.

Banjo Tuner — Free Online Tuner

Banjo

— Hz

5th G4 392.0 Hz —

4th D3 146.8 Hz —

3rd G3 196.0 Hz —

2nd B3 246.9 Hz —

1st D4 293.7 Hz —

Allow microphone access when prompted

Select Instrument to Tune

Chromatic All 12 notes ซออู้ 4 Tunings ซอด้วง 2 Strings ซอสามสาย 3 Strings Guitar 2 Tunings Violin 4 Strings Cello 4 Strings Bass 4 Strings Ukulele 4 Strings จะเข้ 3 Tunings พิณ 2 Tunings กระจับปี่ 4 Strings Mandolin 4 Strings Viola 4 Strings Banjo 2 Tunings Double Bass 2 Tunings Guitar 7-string 2 Tunings

Reference Tone A4 = 440 Hz

Tap any string card above to hear the reference pitch

Metronome

120 BPM

Banjo Tuner Online

Free online banjo tuner supporting Open G and Double C tunings. Get your 5-string banjo perfectly tuned in no time.

Accurate: Precision within 1 cent using the Pitchy algorithm.
Fast: Real-time response with visual waveform and stability chart.
Private: All audio stays on your device. Nothing is sent to any server.
Free: No ads, no subscriptions, no sign-up required.

Supported Instruments

Guitar Tuner

Tune your acoustic or electric guitar in Standard (E A D G B e) or Drop D tuning. Each string card lights up when your pitch is close, turning green when you're in tune.

Violin Tuner

Tune your violin in Standard tuning (G D A E). The real-time needle and stability chart help you find and hold each pitch accurately.

Bass Tuner

Tune your bass guitar in Standard tuning (E A D G). The low-frequency pitch detection is optimized to handle bass strings accurately.

Thai Instrument Tuner (ซออู้, ซอด้วง, ซอสามสาย)

Tuner Free is one of the few online tuners with dedicated support for Thai classical instruments. Tune ซออู้ (Sao U) in four tunings — ทางเพียงออ, ทางกลาง, ทางนอก, and ทางใน — as well as ซอด้วง (Sao Duang) and ซอสามสาย (Sao Sam Sai).

Frequently Asked Questions

Is Tuner Free really free to use?

Yes, completely free. No ads, no subscriptions, no sign-up required. Just open the website and start tuning.

Does Tuner Free work on mobile?

Yes. It works on all modern browsers including mobile browsers on iOS and Android. Just allow microphone access when prompted.

Does my audio get sent to a server?

No. All audio processing happens entirely on your device using the Web Audio API. Your microphone audio is never uploaded anywhere, ensuring complete privacy.

Can I tune Thai instruments with Tuner Free?

Yes! Tuner Free has dedicated modes for ซออู้, ซอด้วง, and ซอสามสาย — with multiple tunings for ซออู้ including ทางเพียงออ, ทางกลาง, ทางนอก, and ทางใน.

How accurate is the tuner?

Tuner Free uses the Pitchy pitch detection algorithm with accuracy within 1 cent. The stability chart lets you see how steady your pitch is over time.