Instrument Tuner

Runs entirely in your browser — no audio or data ever leaves your device (see methodology).

How It Works

The Instrument Tuner listens through your device's microphone and compares the pitch it detects against the target notes of standard tuning for guitar (E-A-D-G-B-E) or ukulele (G-C-E-A, reentrant — see Ukulele Reentrant Tuning Explained for what that specific tuning means), showing in real time whether a plucked string is flat, sharp, or in tune. For piano, where a player can't directly adjust a fixed instrument's pitch by ear the way a guitarist or ukulele player tunes a string, the tool instead offers reference tones — precisely pitched notes to play alongside and compare against, most useful for confirming an instrument's overall tuning or for ear-training purposes. Pitch detection works by analyzing the fundamental frequency of the sound your microphone picks up and matching it against the nearest standard-tuning target note, displaying the difference in cents (the standard unit for measuring pitch deviation smaller than a full semitone) so you can see not just whether a string is out of tune but specifically how far off, and in which direction, letting you make a precise adjustment rather than guessing. Accurate tuning matters directly to everything else this site documents, worth stating plainly rather than assuming it's obvious: every chord diagram and every fingering note across this site's guitar and ukulele pages assumes the instrument is genuinely in standard tuning to begin with, and a chord shape fretted perfectly correctly on an out-of-tune instrument will still sound audibly wrong — no amount of fingering-technique refinement fixes a tuning problem, which is exactly why this tool exists as a genuine practical prerequisite rather than an optional add-on. All pitch detection happens directly in your browser using your device's own microphone input — no audio is recorded, saved, or transmitted anywhere, and the tool works entirely offline once the page has loaded, processing sound locally in real time rather than sending anything to a server for analysis. Alternate tunings, briefly discussed in Guitar Tuning Explained (drop D, open tunings, and others), aren't the tool's default target but can be a useful thing to keep in mind if a reading seems consistently, deliberately "off" from standard tuning in a specific, patterned way — that's often a sign an instrument is intentionally tuned to something other than standard EADGBE rather than a sign of a tuning problem needing correction. Tuning stability, not just an initial correct tuning, matters for consistent chord playing, and the tool's cents-based readout is precise enough to catch the small, gradual pitch drift that happens naturally as new strings stretch and settle, as temperature and humidity shift a room, or as an instrument simply gets played and handled over a session. Checking tuning periodically through a practice session, rather than only once at the very start, catches this drift before it becomes audible enough to make correctly-fingered chords sound subtly wrong. Ukulele tuning specifically benefits from the tool's precision given the instrument's characteristically light string tension and shorter scale length, both of which make ukulele strings more prone to noticeable pitch drift than a guitar's heavier, higher-tension strings — new ukulele strings in particular often need retuning several times in the first few sessions of play before they fully settle and hold pitch reliably, a normal, expected part of breaking in a new set of strings rather than a sign of a faulty tuner reading. For guitarists using a capo, it's worth tuning the open strings before placing the capo, then optionally rechecking the fretted, capoed strings afterward — a capo placed slightly unevenly or with uneven pressure can occasionally pull certain strings very slightly sharp, a real, physical effect the tuner will pick up on immediately if you check after capo placement rather than trusting the pre-capo tuning to hold perfectly unchanged. The tuner's target notes are drawn from the identical tuning data referenced throughout this site's Guitar Tuning Explained and Ukulele Reentrant Tuning Explained pages, so a chord that sounds correct once tuned with this tool will match the fingerings and diagrams documented across every guitar and ukulele chord page on the site, with no separate or inconsistent tuning reference at play behind the scenes. Piano reference tones are generated at standard concert pitch (A4 at 440 Hz, the widely used modern tuning standard), matching the same reference point virtually all contemporary instruments, recordings, and other tuners are built around — a genuinely useful detail to know if you're ever comparing this tool's output against a separate tuning device or an older instrument tuned to a different historical standard, since pitch standards have shifted over musical history and aren't universal across every instrument or era. The tool requires microphone permission to function for guitar and ukulele tuning specifically, since live pitch detection depends on actually hearing the string being tuned — this permission request is a standard browser feature, not unique to this tool, and can be revoked at any time through your browser's own settings without affecting any other part of the site. Piano reference-tone mode doesn't require microphone access at all, since it only plays sound rather than listening for it, making it usable even in a browser where microphone permission has been declined, or in a shared or public space where enabling a microphone isn't practical or comfortable in the first place. Either mode gets you to the same real goal: an instrument that's genuinely in tune before any chord practice begins, which is worth confirming first every single session rather than assuming yesterday's tuning has held.

FAQ

Does the tuner work in a noisy room?

Background noise can interfere with accurate pitch detection, since the tool is analyzing whatever sound your microphone picks up. For the most reliable readings, tune in a reasonably quiet space and pluck strings clearly and individually rather than strumming multiple strings at once.

Why does piano use reference tones instead of live pitch detection?

A piano's pitch can't be adjusted string-by-string in the moment the way a guitar or ukulele string can while playing — piano tuning is a specialized mechanical adjustment usually done by a professional tuner. Reference tones instead let you compare an already-tuned piano's notes for ear training or general pitch confirmation.

Is any audio from my microphone saved or sent anywhere?

No — all pitch analysis happens locally in your browser in real time. Nothing is recorded, stored, or transmitted to any server.