Chord Finder

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

How It Works

Every other chord tool on this site starts from a chord's name and produces its notes and fingerings; the Chord Finder runs that exact process in reverse. Enter a set of notes, or describe a shape you've found on a fretboard or keyboard but don't recognize, and the tool matches that input against the same stacked-3rds chord-construction logic covered in How Chords Are Built to identify which chord (or chords) those notes actually form. This reverse lookup solves a genuinely common, practical problem: a guitarist or pianist who's worked out an interesting-sounding shape by ear or by accident, without knowing its formal name, has no way to look it up on a conventional chord page organized by chord name — there's nothing to search for yet. The Chord Finder exists specifically for that moment, taking the notes as the known starting point and working backward to the name, rather than assuming the name is already known. Because a given set of notes can sometimes match more than one valid chord name — the identical three or four pitches can, depending on which note is treated as the root, describe two genuinely different chords, a real consequence of how enharmonic and inversion relationships work (Chord Inversions covers this from the bass-note-in-any-chord angle) — the tool surfaces every valid match rather than forcing a single answer, since more than one might be musically and theoretically correct depending on context. Once a match is found, the Chord Finder links directly to that chord's own dedicated page on this site, where the full genuinely-written character, use, and practice content already documented for that chord (across guitar, piano, and ukulele where applicable) picks up exactly where this reverse-lookup process leaves off — the finder's job is narrowly to identify the chord; the deeper explanation of what makes it musically distinctive lives on the chord's own page. The underlying matching logic is the identical semitone-interval math covered throughout this site's theory content, particularly How Chords Are Built and Intervals Explained — there's no separate, hidden system at work behind the tool beyond the same stacked-3rds construction process a musician could, in principle, work through by hand given enough time and enough interval-counting patience. The tool's real value is doing that matching instantly rather than requiring a manual semitone-by-semitone search across every possible root and quality combination. Guitar and ukulele fingering input is supported directly alongside plain note entry, letting you describe a shape by fret position on each string rather than needing to first work out which actual notes that shape produces before searching — the tool converts the fingering to its underlying notes internally, using the exact tuning data covered in Guitar Tuning Explained and Ukulele Reentrant Tuning Explained for each instrument, then runs the identical note-matching process either way. This is particularly useful for a shape encountered in a video lesson, an old chord book, or a bandmate's demonstration where only the physical finger positions were shown, not a chord name. Ambiguous or incomplete shapes — a partial fingering missing one string, or a note set that doesn't cleanly resolve to a single standard chord quality — are handled by returning the closest plausible matches along with a note of which input notes each candidate match does and doesn't account for, rather than either forcing a single potentially-wrong answer or returning nothing useful at all. This mirrors how a working musician actually reasons through an ambiguous shape in real life: comparing several plausible interpretations rather than assuming there's always exactly one unambiguous right answer waiting to be found. A common practical use case worth naming directly: a player who has learned a song's chord progression by ear, working out each chord shape through trial and error without naming any of them along the way, can run each shape through the Chord Finder afterward to build a proper, nameable chord chart — turning an ear-learned progression into something that can be written down, shared, or transposed using the Chord Progression Transposer, rather than remaining only a set of memorized physical shapes with no formal names attached. The tool deliberately doesn't require an account, save any entered data, or send note or fingering input anywhere beyond your own device — all matching happens locally, consistent with how every interactive tool on this site is built, so experimenting freely with unusual note combinations or half-remembered shapes carries no privacy tradeoff and requires no setup beyond simply entering what you know. Piano input works by selecting keys directly on an on-screen keyboard rather than typing note names, which is often the fastest and most intuitive way to enter a chord you can already play but can't yet name — press the same keys on the tool's keyboard that you'd press on a real piano, and the matching process runs identically to note or fingering entry from the other two instruments, since all three ultimately reduce to the same underlying pitch-class comparison this page describes throughout. Whichever input method you use, the goal is the same: turning an unnamed sound you can already produce on your instrument into a real, searchable chord identity connected to the rest of this site's chord content, so the next time you encounter the same shape, it's already a known quantity rather than a mystery to work out again from scratch, and every match links straight back into the site's own chord library rather than leaving you with a name alone.

FAQ

What if I only know some of a chord's notes, not all of them?

Partial note sets can still narrow down likely matches, though the fewer notes entered, the more possible chords will match — entering a chord's full note set, when you can determine it, produces the most reliable and specific single result.

Why does the tool sometimes return more than one chord name for the same notes?

Because the identical set of notes can, depending on which one is treated as the root, correctly describe more than one chord — this is a genuine, common feature of how notes and chord names relate, not an error, and it happens most often with symmetric or closely related chord structures.

Does the Chord Finder work for all three instruments?

The underlying note-matching logic is instrument-agnostic, since it's based on pitch classes rather than physical fingerings — once a chord name is identified, follow the link to that chord's own page for guitar, piano, and ukulele-specific fingerings and voicings.