Guitar Chord Finder — Identify Chords by Fingering

A guitar chord finder (also known as a reverse chord finder) identifies the name and musical structure of any chord directly from its fretboard fingering. Instead of looking up a chord name to see where your fingers belong, you enter the frets and strings you are holding on the interactive neck above, and the tool calculates the root, quality, intervals, inversions, and alternate names in real time.

Whether you stumbled upon a compelling voicing while songwriting, found an unfamiliar shape in a fingerstyle arrangement, or need to name a chord for your bandmates, this tool breaks down the exact music theory behind your fingers with zero guesswork.

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How to use the interactive chord finder

Operating the reverse chord finder takes only seconds:

1. Place notes on the neck: Click any fret from 1 to 12 across the six strings. A gold marker confirms the note’s pitch name and sounds the pitch.
2. Toggle open strings: Click the round O button at the nut column to let an open string ring.
3. Mute unused strings: Click the ✕ Mute button beside any string you want silenced. Muted strings are excluded from chord detection.
4. Hear your voicing: Click Strum Chord to hear a realistic acoustic strum across all active strings, or click Arpeggiate to hear each note plucked individually from low to high.
5. Inspect the theory: The results panel below the neck reveals the chord’s name, inversion, formula, interval breakdown, and standard voicing alternatives from our chord library.
6. Try presets or clear: Use the preset chips (C Major, G Major, F Barre, D7, etc.) to explore common shapes, or hit Clear to start from a blank neck.

If you are unfamiliar with standard fretboard diagrams, our guide on how to read guitar chord charts explains fret symbols, string numbers, and finger placements in full detail.

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How chord names are derived from your fingering

Every chord name in Western music follows mathematical relationships between pitch frequencies, known as intervals. When you place your fingers on the guitar neck, the chord finder measures the distance in semitones between each sounding pitch to determine the chord’s construction.

1. The three building blocks: Root, Third, and Fifth

A basic chord is a triad, built from three essential notes:

• Root (1): The foundation note that gives the chord its letter name (for example, C in a C chord).
• Third (3 or ♭3): Determines whether the chord sounds bright (major third, 4 semitones above root) or dark (minor third, 3 semitones above root).
• Fifth (5, ♭5, or ♯5): Provides harmonic stability (perfect fifth, 7 semitones above root). Altering the fifth creates diminished (♭5) or augmented (♯5) chords.

Chord Quality	Formula	Semitones	Example on C	Sound Characteristic
Major Triad	1 – 3 – 5	0 – 4 – 7	C – E – G	Bright, resolved, stable
Minor Triad	1 – ♭3 – 5	0 – 3 – 7	C – E♭ – G	Dark, melancholic, reflective
Diminished	1 – ♭3 – ♭5	0 – 3 – 6	C – E♭ – G♭	Tense, unstable, resolving
Augmented	1 – 3 – ♯5	0 – 4 – 8	C – E – G♯	Mysterious, floating
Suspended 4th (sus4)	1 – 4 – 5	0 – 5 – 7	C – F – G	Open tension, pulls to 3rd
Suspended 2nd (sus2)	1 – 2 – 5	0 – 2 – 7	C – D – G	Airy, modern, open

To practise applying these basic triad families to real songs, browse our starter guide to guitar chords for beginners.

2. Inversions and slash chords

On guitar, the lowest note you play is not always the root. When another chord tone sits in the bass, the chord is called an inversion or a slash chord:

• Root Position: The root note is the lowest sounding pitch. In an open C chord (x 3 2 0 1 0), C on the 5th string is the bass.
• First Inversion (Slash / 3rd): The third sits in the bass. Letting the low E string ring under an open C shape (0 3 2 0 1 0) produces C/E (“C over E”), giving the harmony a warmer bassline.
• Second Inversion (Slash / 5th): The fifth sits in the bass. Fretting G on the 6th string under an open C shape (3 3 2 0 1 0) creates C/G, providing deep harmonic weight.
• Third Inversion (Slash / 7th): Found in four-note seventh chords when the 7th is in the bass (e.g., G7/F resolving to C/E).

3. Seventh chords and color extensions

Adding a fourth note to a triad introduces seventh chords and harmonic color:

• Dominant 7th (1 – 3 – 5 – ♭7): Combines a major triad with a minor 7th (e.g., C7 = C–E–G–B♭). The harmonic engine of blues and rock.
• Major 7th (1 – 3 – 5 – 7): Combines a major triad with a natural 7th (e.g., Cmaj7 = C–E–G–B). Lush and essential in jazz.
• Minor 7th (1 – ♭3 – 5 – ♭7): Combines a minor triad with a minor 7th (e.g., Am7 = A–C–E–G). Smooth and versatile.
• Add9 (1 – 3 – 5 – 9): Adds a 9th without adding a 7th (e.g., Cadd9 = C–E–G–D), a beloved acoustic pop voicing.

To see all these shapes mapped systematically across the neck, check out our printable guitar chord chart and explore the CAGED system for guitar.

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Why audio and AI chord finders are fundamentally different tools

Many guitarists search for a “chord finder” expecting an app that listens through a microphone or transcribes audio files. Reverse fingering finders and audio/AI chord identifiers are fundamentally different tools:

1. Polyphonic pitch detection requires server-side processing

Detecting a single note through a microphone (monophonic pitch detection) runs cleanly in web browsers—this is how our guitar tuner operates.

However, detecting a strummed chord (polyphonic detection) requires analyzing six vibrating strings simultaneously. Each steel string produces overlapping harmonics, overtones, and body resonances that collide across the audio spectrum. Untangling these waves in real time requires machine-learning neural networks and remote servers.

2. Audio detectors cannot tell which string you fretted

Even when AI software identifies that C, E, and G are sounding, it cannot determine where on the fretboard you played them. On guitar, middle C (C4) can be fretted on the 2nd string (fret 1), 3rd string (fret 5), 4th string (fret 10), or 5th string (fret 15).

An audio detector cannot distinguish between an open C shape and an 8th-fret barre chord because both produce identical pitch classes. Our visual chord finder lets you specify the exact physical fret and string, guaranteeing 100% theoretical accuracy.

3. Zero latency, total privacy, and no subscriptions

Audio-based transcription apps frequently require uploading audio to remote servers and paying recurring subscriptions. Our reverse chord finder runs entirely in your local browser using pure JavaScript and the Web Audio API. No audio leaves your device, and results update instantly.

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Capos, alternate tunings, and practical tips

Using a capo

A guitar capo acts as a movable nut, shortening string length and raising pitch by one semitone per fret:

• Clamping a capo at fret 2 and playing an open G shape (3 2 0 0 0 3) sounds an A major chord.
• To find the sounding chord with a capo, enter physical fret numbers measured from the guitar’s nut (fret 0).
• To identify the shape family, input finger positions as if the capo were the nut.

Missing notes and implied harmonies

On guitar, four fingers cannot always hold every note of an extended chord. Guitarists routinely omit the fifth (which adds stability but no harmonic color) to voice extensions like 9ths and 13ths. The chord finder detects incomplete voicings and identifies the most probable chord candidate.

To understand how notes connect across the neck, study our guide to guitar fretboard notes and compare voicings on the virtual piano.

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Related tools

• Virtual Guitar Lab — Play guitar chords, practice scales, test tunings, and loop strumming patterns on an interactive neck.
• Circle of Fifths — Explore major and minor keys, key signatures, and diatonic chord progressions with an interactive wheel.
• Guitar Tuner — Tune your acoustic or electric guitar with real-time microphone pitch detection and standard/alternate presets.
• Virtual Piano — Play notes, test chord inversions, and visualize keyboard intervals with polyphonic sound.