Tuner
← All toolsPick an instrument and a tuning, then tune it either way round: tap a string to hear its exact pitch and match it by ear, or start the microphone and read how many cents sharp or flat you are off a brass needle. The reference tones and the string chart need no permissions at all — the microphone is an upgrade, not a gate.
Microphone audio is processed entirely in your browser and never uploaded.
Tuner
Idle
Guitar — Standard (EADGBE)
| String | Note | Frequency | Reference tone |
|---|---|---|---|
| 6th | E2 | 82.41 Hz | |
| 5th | A2 | 110.00 Hz | |
| 4th | D3 | 146.83 Hz | |
| 3rd | G3 | 196.00 Hz | |
| 2nd | B3 | 246.94 Hz | |
| 1st | E4 | 329.63 Hz |
Tap Tone to hear a string and tune to it by ear — no microphone needed. Auto is on, so the needle below follows whichever string you are nearest.
Live pitch — microphone
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Optional. Tap Start listening for a live needle, or tune by ear with the tones above.
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Microphone audio is processed on-device and never leaves your browser — and the chart and reference tones above never need it at all.
How to use the Tuner
- Choose your instrument and tuning from the picker — twelve presets from a 5-string bass to a reentrant ukulele, with every string's target frequency listed underneath.
- Tap Tone on any string to hear that exact pitch, and tune to it by ear. Nothing is requested and nothing is recorded; this alone will get an instrument in tune.
- For a needle, tap Start listening and allow microphone access. Audio is analyzed locally, frame by frame, and never uploaded.
- Leave Auto on to have the needle follow whichever string you are closest to, or tap Target on one string to pin it there — useful when a string is so far out that the nearest string is the wrong one.
FAQ
- Do I need to give microphone permission to use this?
- No. Every string in every preset has a reference tone you can play through your speakers or headphones and tune to by ear, and the full chart of notes and target frequencies is on the page before anything is requested. Microphone access adds a live needle; it is not required for the page to do its job.
- Does my microphone audio get uploaded anywhere?
- No. The microphone stream is only ever connected to a local Web Audio AnalyserNode in your own browser tab — it is analyzed and immediately discarded, frame by frame. Nothing is recorded, saved, or sent to any server.
- Will it detect a 5-string bass low B?
- Yes. That note is 30.87 Hz, and one cycle of it is over 1500 samples at 48 kHz — a conventional 2048-sample tuner window holds barely one and a third cycles and cannot resolve it. Selecting a low tuning here lengthens the analysis window to 16384 samples, and the detector normalizes for the fact that a bass string's fundamental is far quieter than its harmonics, so it reports the fundamental rather than the octave above it.
- Why does it say "No clear pitch"?
- The detector needs a single, sustained, reasonably clean tone. Chords, percussive plucks, background noise, or a very quiet signal won't produce a stable enough waveform to lock onto — let the note ring and try again a little louder.
- Can I tune to something other than A440?
- Yes — the concert pitch field accepts any value from 415–466 Hz, so you can match an orchestra tuning to A442 or a period-instrument ensemble tuning lower. Every string's target frequency in the chart is recomputed from that value, so the numbers on screen are always the numbers being aimed at.
Every preset, every string
Twelve tunings, generated from the one table the tuner itself runs on — so what is printed here is exactly what the needle aims at. Frequencies are equal temperament at A4 = 440 Hz; the tunings with a page of their own are linked.
| Tuning | Strings, low to high | Frequency (Hz, A4 = 440) |
|---|---|---|
| Guitar — Standard (EADGBE) | E2 A2 D3 G3 B3 E4 | 82.41 110.00 146.83 196.00 246.94 329.63 |
| Guitar — Drop D (DADGBE) | D2 A2 D3 G3 B3 E4 | 73.42 110.00 146.83 196.00 246.94 329.63 |
| Guitar — DADGAD | D2 A2 D3 G3 A3 D4 | 73.42 110.00 146.83 196.00 220.00 293.66 |
| Guitar — Open G (DGDGBD) | D2 G2 D3 G3 B3 D4 | 73.42 98.00 146.83 196.00 246.94 293.66 |
| Guitar — Open D (DADF#AD) | D2 A2 D3 F♯3 A3 D4 | 73.42 110.00 146.83 185.00 220.00 293.66 |
| Guitar — Half step down (E♭ standard) | E♭2 A♭2 D♭3 G♭3 B♭3 E♭4 | 77.78 103.83 138.59 185.00 233.08 311.13 |
| Bass — 4-string (EADG) | E1 A1 D2 G2 | 41.20 55.00 73.42 98.00 |
| Bass — 5-string (BEADG) | B0 E1 A1 D2 G2 | 30.87 41.20 55.00 73.42 98.00 |
| Ukulele — Standard (GCEA) | G4 C4 E4 A4 | 392.00 261.63 329.63 440.00 |
| Violin — Standard (GDAE) | G3 D4 A4 E5 | 196.00 293.66 440.00 659.26 |
| Cello — Standard (CGDA) | C2 G2 D3 A3 | 65.41 98.00 146.83 220.00 |
| Banjo — Open G (gDGBD) | G4 D3 G3 B3 D4 | 392.00 146.83 196.00 246.94 293.66 |
