How do I tune a guitar with this online tuner?

Choose the intended tuning and leave A = 440 unless the other musicians use a different reference. Allow microphone access, mute the other strings and pluck one open string at a time. Sharp means its measured pitch is above the target; tune down. Flat means below; tune up. Move a peg in small steps. The green band is within five displayed cents. A heavily mistuned string can be nearer a different open string: choose Selected string and select the intended string to keep the correct target.

Can I tune by ear without a microphone or download?

Yes. Select a string or press its note chip to generate a two-second reference tone. Compare one string at a time with the tone by ear. A microphone is required only for automatic pitch detection. This is a browser tool, with no download, account or install needed; it does not operate a physical peg, clip-on tuner or pedal.

Which alternate guitar tunings are available?

Drop D is D2 A2 D3 G3 B3 E4; half step down is Eb2 Ab2 Db3 Gb3 Bb3 Eb4; whole step down or D standard is D2 G2 C3 F3 A3 D4. Open D is D2 A2 D3 F#3 A3 D4. Open C is C2 G2 C3 G3 C4 E4; C standard is C2 F2 Bb2 Eb3 G3 C4, a different tuning. Double Drop D lowers both E strings, to D2 A2 D3 G3 B3 D4. Baritone B standard is B1 E2 A2 D3 F#3 B3. Those are explicit target sets, not advice that every guitar or string set is suited to every tuning.

What changes between automatic string, selected string and chromatic modes?

Nearest string measures cents against the closest open string of the selected preset. Selected string holds the chosen target even when your note is nearer a different string. Nearest chromatic note measures cents against the closest equal-tempered note at the selected A reference, so the cents bar works independently of guitar string targets. The detector analyses one pitch at a time. A chord or dominant harmonic can produce an ambiguous or incorrect note; the tool does not identify every string in a chord.

Why is there no pitch reading, or why is the octave wrong?

Too quiet means the microphone level is below the detector floor. Move closer, pluck again or select the actual microphone or USB interface. No clear pitch means the current samples do not provide a strong accepted period. Mute other strings and let the initial attack settle. Harmonics can dominate the fundamental, especially on bass; an octave reading is not proof that the open string is correct. In Selected string mode, the 12th-fret harmonic option deliberately moves the target one octave up.

Does it work for bass, upright bass and ukulele?

The tuning menu contains four-string bass E1 A1 D2 G2, five-string B0 E1 A1 D2 G2 and six-string B0 E1 A1 D2 G2 C3, plus bass Drop D, Drop C and D standard. A standard four-string upright bass or bass ukulele has the same E A D G targets. Ukulele high G is G4 C4 E4 A4, low G is G3 C4 E4 A4 and baritone is D3 G3 B3 E4. Select the actual tuning before using the string bar. Low bass needs a clean input and time to settle; the detector’s nominal range is 30–1200 Hz, with longer sample frames at higher device sample rates.

Should the reference be 432, 440 or 442 Hz?

The reference is A4. A = 440 is the usual starting point; choose 432 or 442 only when that is the pitch you intend to match. The selection recalculates every string target and reference tone using equal temperament. There is no health or sound-quality benefit claimed for a different reference. Generated frequency values do not establish the physical accuracy of the microphone, audio interface or speaker clock.

Can I use an electric guitar or bass through a USB interface?

Yes, when the interface appears to the browser as an audio input. Allow audio access, then choose that input in the Input menu. The analyser is not connected to the speakers, so this tool does not monitor or amplify the input. A guitar’s plain instrument cable is not itself a browser microphone. Reference tones still play through the browser’s output device.

Is my audio uploaded, and what is remembered?

No audio is recorded or sent anywhere. The page reads a short sample frame, analyses it and discards it. Stop or Cancel invalidates the current request and releases its tracks; a late permission response is also released. Only intentional tuning and reference preferences are saved in this browser when storage is available. Opening a preset page or restoring a preference alone does not change the saved tuning.

Guitar Tuner

Tune an acoustic, electric or nylon-string guitar in your browser using a microphone, a browser-visible USB audio input, or two-second reference tones by ear. Standard tuning is E2 A2 D3 G3 B3 E4. Choose Drop D, half or whole step down, Open D, Open C, C standard, double Drop D or baritone B standard; the targets and tones change with the selected notes. Bass and ukulele presets are also available. Nearest string follows the closest open string; Selected string keeps a fixed target while you turn the peg; Nearest chromatic note compares against the detected note itself. Audio samples are processed in the page and discarded. Stop, Cancel request or leaving the page releases this tool’s microphone stream.

Tune with your microphone

Your browser asks for permission first, because no page may listen without it. The samples are read in the page and dropped: nothing is recorded and nothing is uploaded.

Nothing is recordedNothing is uploadedThe stream closes when you stopNo account, nothing installed

Tuning: Tuning

Reference

Input

Compare with
Reference / selected string

The cents bar follows the nearest open string in the selected tuning. Use Selected string to keep a fixed target.

The microphone is closed. Press Start to tune with it, or Play to hear a reference tone.

Why the browser asks permission first. A page cannot listen until you allow it, and the prompt is your browser's, not this site's. Allow it, play one string on its own, and the note should appear within a moment. The tuner reads the samples as they arrive and throws them away: there is no recording, and the stream closes the moment you press Listening or leave the page. Noise suppression and automatic gain are requested off, because a gate that mutes the room between notes, or a gain that rides a decaying string, gets between the detector and the string.

Strings in each tuning

Every listed frequency here is at A = 440, the reference chosen above, and sets the generated reference tone. Physical playback also depends on your device clock. Any string is tuned the same way: play it, watch the bar, and turn the peg until the needle sits in the green. Sharp means the measured pitch is higher than the target; flat means lower. Ukulele high G is re-entrant, so its first listed string is not the lowest pitch.

Tuning	Strings in instrument order	Frequencies
Standard	E2 A2 D3 G3 B3 E4	82.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz
Drop D	D2 A2 D3 G3 B3 E4	73.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz
Half step down	Eb2 Ab2 Db3 Gb3 Bb3 Eb4	77.8 Hz, 103.8 Hz, 138.6 Hz, 185.0 Hz, 233.1 Hz, 311.1 Hz
Bass	E1 A1 D2 G2	41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Whole step down	D2 G2 C3 F3 A3 D4	73.4 Hz, 98.0 Hz, 130.8 Hz, 174.6 Hz, 220.0 Hz, 293.7 Hz
Open D	D2 A2 D3 F#3 A3 D4	73.4 Hz, 110.0 Hz, 146.8 Hz, 185.0 Hz, 220.0 Hz, 293.7 Hz
Open C	C2 G2 C3 G3 C4 E4	65.4 Hz, 98.0 Hz, 130.8 Hz, 196.0 Hz, 261.6 Hz, 329.6 Hz
C standard	C2 F2 Bb2 Eb3 G3 C4	65.4 Hz, 87.3 Hz, 116.5 Hz, 155.6 Hz, 196.0 Hz, 261.6 Hz
Baritone B standard	B1 E2 A2 D3 F#3 B3	61.7 Hz, 82.4 Hz, 110.0 Hz, 146.8 Hz, 185.0 Hz, 246.9 Hz
Double drop D	D2 A2 D3 G3 B3 D4	73.4 Hz, 110.0 Hz, 146.8 Hz, 196.0 Hz, 246.9 Hz, 293.7 Hz
Five-string bass	B0 E1 A1 D2 G2	30.9 Hz, 41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Six-string bass	B0 E1 A1 D2 G2 C3	30.9 Hz, 41.2 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz, 130.8 Hz
Bass drop D	D1 A1 D2 G2	36.7 Hz, 55.0 Hz, 73.4 Hz, 98.0 Hz
Bass drop C	C1 G1 C2 F2	32.7 Hz, 49.0 Hz, 65.4 Hz, 87.3 Hz
Bass D standard	D1 G1 C2 F2	36.7 Hz, 49.0 Hz, 65.4 Hz, 87.3 Hz
Ukulele high G	G4 C4 E4 A4	392.0 Hz, 261.6 Hz, 329.6 Hz, 440.0 Hz
Ukulele low G	G3 C4 E4 A4	196.0 Hz, 261.6 Hz, 329.6 Hz, 440.0 Hz
Baritone ukulele	D3 G3 B3 E4	146.8 Hz, 196.0 Hz, 246.9 Hz, 329.6 Hz

Accuracy. Autocorrelation resolves synthetic steady tones above 80 Hz to within one cent. Microphone noise, harmonics and a decaying string can widen or shift readings. Reference tones use equal-tempered target frequencies; playback depends on the device clock. No audio is recorded or sent anywhere.

Common questions

How do I tune a guitar with this online tuner?: Choose the intended tuning and leave A = 440 unless the other musicians use a different reference. Allow microphone access, mute the other strings and pluck one open string at a time. Sharp means its measured pitch is above the target; tune down. Flat means below; tune up. Move a peg in small steps. The green band is within five displayed cents. A heavily mistuned string can be nearer a different open string: choose Selected string and select the intended string to keep the correct target.
Can I tune by ear without a microphone or download?: Yes. Select a string or press its note chip to generate a two-second reference tone. Compare one string at a time with the tone by ear. A microphone is required only for automatic pitch detection. This is a browser tool, with no download, account or install needed; it does not operate a physical peg, clip-on tuner or pedal.
Which alternate guitar tunings are available?: Drop D is D2 A2 D3 G3 B3 E4; half step down is Eb2 Ab2 Db3 Gb3 Bb3 Eb4; whole step down or D standard is D2 G2 C3 F3 A3 D4. Open D is D2 A2 D3 F#3 A3 D4. Open C is C2 G2 C3 G3 C4 E4; C standard is C2 F2 Bb2 Eb3 G3 C4, a different tuning. Double Drop D lowers both E strings, to D2 A2 D3 G3 B3 D4. Baritone B standard is B1 E2 A2 D3 F#3 B3. Those are explicit target sets, not advice that every guitar or string set is suited to every tuning.
What changes between automatic string, selected string and chromatic modes?: Nearest string measures cents against the closest open string of the selected preset. Selected string holds the chosen target even when your note is nearer a different string. Nearest chromatic note measures cents against the closest equal-tempered note at the selected A reference, so the cents bar works independently of guitar string targets. The detector analyses one pitch at a time. A chord or dominant harmonic can produce an ambiguous or incorrect note; the tool does not identify every string in a chord.
Why is there no pitch reading, or why is the octave wrong?: Too quiet means the microphone level is below the detector floor. Move closer, pluck again or select the actual microphone or USB interface. No clear pitch means the current samples do not provide a strong accepted period. Mute other strings and let the initial attack settle. Harmonics can dominate the fundamental, especially on bass; an octave reading is not proof that the open string is correct. In Selected string mode, the 12th-fret harmonic option deliberately moves the target one octave up.
Does it work for bass, upright bass and ukulele?: The tuning menu contains four-string bass E1 A1 D2 G2, five-string B0 E1 A1 D2 G2 and six-string B0 E1 A1 D2 G2 C3, plus bass Drop D, Drop C and D standard. A standard four-string upright bass or bass ukulele has the same E A D G targets. Ukulele high G is G4 C4 E4 A4, low G is G3 C4 E4 A4 and baritone is D3 G3 B3 E4. Select the actual tuning before using the string bar. Low bass needs a clean input and time to settle; the detector’s nominal range is 30–1200 Hz, with longer sample frames at higher device sample rates.
Should the reference be 432, 440 or 442 Hz?: The reference is A4. A = 440 is the usual starting point; choose 432 or 442 only when that is the pitch you intend to match. The selection recalculates every string target and reference tone using equal temperament. There is no health or sound-quality benefit claimed for a different reference. Generated frequency values do not establish the physical accuracy of the microphone, audio interface or speaker clock.
Can I use an electric guitar or bass through a USB interface?: Yes, when the interface appears to the browser as an audio input. Allow audio access, then choose that input in the Input menu. The analyser is not connected to the speakers, so this tool does not monitor or amplify the input. A guitar’s plain instrument cable is not itself a browser microphone. Reference tones still play through the browser’s output device.
Is my audio uploaded, and what is remembered?: No audio is recorded or sent anywhere. The page reads a short sample frame, analyses it and discards it. Stop or Cancel invalidates the current request and releases its tracks; a late permission response is also released. Only intentional tuning and reference preferences are saved in this browser when storage is available. Opening a preset page or restoring a preference alone does not change the saved tuning.

Autocorrelation resolves synthetic steady tones above 80 Hz to within one cent. Microphone noise, harmonics and a decaying string can widen or shift readings. Reference tones use equal-tempered target frequencies; playback depends on the device clock. No audio is recorded or sent anywhere.