The Free Online Chromatic Guitar Tuner
Professional-grade pitch detection in your browser. No download, no subscription, no compromise.
GuitarTunePro is a free online chromatic guitar tuner built for players of all skill levels — from first-time beginners to touring professionals. It runs entirely in your web browser using the Web Audio API, which means you can tune your guitar with a microphone on any device without installing anything.
Unlike many tuners that rely on simple frequency estimation, GuitarTunePro uses an optimized YIN-inspired autocorrelation algorithm operating at a 48 kHz sample rate with a 4096-sample processing window. This delivers high accuracy pitch detection to within ±1 cent — precise enough for studio recording, live performance, and critical ear training.
The tuner supports 6-string, 7-string, 12-string, bass, and ukulele, with presets for Standard (E A D G B E), Drop D, Half-Step Down, Open G, Open D, DADGAD, and more. Automatic string detection identifies which string you're playing so you can tune all six strings without touching the screen. A smooth needle display with a real-time cent offset readout tells you exactly how far each string is from its target note.
GuitarTunePro is developed and maintained by the GuitarTunePro team. All audio processing happens locally on your device — no audio data is ever sent to a server. The tuner is completely free and always will be.
Frequently Asked Questions
Everything you need to know about using GuitarTunePro.
Does this work without downloading anything?
Yes. GuitarTunePro is a completely browser-based free online guitar tuner — no app download, no installation, and no account required. Open the site on any device with a modern web browser and a microphone, and you're ready to tune.
How accurate is the tuner?
GuitarTunePro uses a high-accuracy pitch detection algorithm running at a 48 kHz sample rate with a 4096-sample FFT window. This gives ±1 cent precision — accurate enough for professional use, live performance, and studio recording.
Does this work on mobile?
Yes. The tuner works on iPhone, Android, tablets, laptops, and desktops. Simply allow microphone access when prompted by your browser, and the tuner will detect your guitar's pitch in real time — no cables or adapters needed.
What guitar tunings are supported?
GuitarTunePro supports Standard (E A D G B E), Drop D, Half-Step Down (Eb), Full-Step Down (D), Open G, Open D, Open A, DADGAD, and many more. You can also use it as a chromatic tuner to detect any note freely.
What instruments can I tune?
The tuner supports 6-string guitar, 7-string guitar, 12-string guitar, bass guitar (4-string and 5-string), and ukulele. Switch between instrument types from the selector above the string display.
Is the tuner completely free?
Yes, GuitarTunePro is 100% free with no hidden fees, subscriptions, or paywalls. The core tuner experience is advertisement-free and will remain free for all players.
Dedicated Alternate Tuners
Each alternate tuner is pre-loaded with the correct target notes so you can switch tunings in seconds.
Free Drop D Tuner
Lower your 6th string to D for one-finger power chords — perfect for rock and metal.
Free Open G Tuner
Tune to Open G — the Keith Richards signature tuning for blues, folk, and slide guitar.
Free Half Step Down Tuner
Tune every string down one semitone — used by Hendrix, Guns N' Roses, and Megadeth.
New to guitar tuning? Explore our free guides: