Tune guitar, bass, ukulele, violin, and custom setups in your browser with live note, hertz, and cents detection.
Microphone access starts only after you click Start tuner. Play one clear string at a time for the most stable reading.
Use this online tuner when you need a fast browser-based guitar tuner, bass tuner, ukulele tuner, violin tuner, or general instrument tuner. Start the microphone only when you are ready, pick a preset or custom targets, and follow the flat / sharp guidance until the note lands in tune.
Detected note
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Cents: —
Waiting for a stable note
Pluck or play one clear note close to the microphone.
Selected target: E2
Use the online tuner the same way you would use a simple guitar tuner app, but without installing anything. Choose the instrument preset that matches what you are holding, tap Start tuner, allow microphone access, and play one string at a time. The large note readout shows the nearest note name, the hertz value shows the measured pitch, and the cents meter tells you whether you are flat, sharp, or centered. If you already know which string you are tuning, tap that target first. The page will still listen chromatically, but the guidance becomes easier to follow because it compares the live pitch to the note you want. This is especially useful for standard guitar tuning, bass tuning, ukulele tuning, and violin tuning, where beginners often want a clear “tune up” or “tune down” message instead of raw note data. For the cleanest result, mute background music, pluck once, and let the note ring. Browser tuning works best when the microphone hears one steady source instead of chords, room reflections, or a speaker playing over the instrument.
This online tuner is built as a chromatic tuner first, so it can detect whatever note reaches the microphone, but the preset list keeps common instruments fast to use. Guitar opens with standard EADGBE targets, which makes the page work as a practical guitar tuner online for acoustic and electric players. Bass uses E1 A1 D2 G2 for the standard four-string layout. Ukulele uses the common C tuning G4 C4 E4 A4, and violin uses G3 D4 A4 E5. The custom mode lets you build your own target list for alternate tunings, practice setups, or instruments that do not fit the default presets. That means the page can act as an instrument tuner for more than one family of strings without pretending to be a giant database of every possible tuning. If you are tuning Drop D, a five-string bass, or another variation, the simplest approach is to switch to custom targets or use the chromatic view and watch the nearest note directly. The tool is designed to support fast everyday tuning, not to lock you into one rigid workflow.
A browser tuner does not guess the note from a preset alone. It listens to live microphone input, checks whether the signal is strong and stable enough, estimates the fundamental frequency, and then maps that frequency to the nearest equal-tempered note. That is why this page can behave like a free online tuner, a guitar string tuner, a bass tuner online, or a general pitch detector online without changing the core engine. The hertz reading is the measured frequency. The note label is the nearest musical name to that frequency. The cents indicator shows how far the pitch sits above or below the target center. Because browser microphones are affected by room noise, harmonics, and distance, the tool uses smoothing and confidence gating instead of reacting to every noisy frame. When the signal is weak, the page deliberately switches back to a listening or weak-signal state instead of showing random note jumps. That honesty matters more than fake precision. In a quiet room with a reasonable microphone, browser pitch detection is good enough for everyday tuning. In a loud rehearsal space, a dedicated clip-on tuner or pedal tuner may still be more reliable.
Hertz and cents sound technical, but they are useful once you connect them to what you hear. Hertz, written as Hz, is the raw measured frequency of the vibrating note. If the tuner shows A4 at 440 Hz, that means the pitch is sitting on the usual concert reference. If you change the reference pitch to 442 Hz or 432 Hz, the tuner recalculates what counts as the center of each note. That is why the A4 control matters. Cents are a much smaller unit used to describe how far away a note is from the exact target. One semitone contains 100 cents, so a reading that is 8 cents flat is close, while a reading that is 35 cents sharp is clearly off. The center mark on the meter represents the target note. Negative cents mean tune up. Positive cents mean tune down. For most players, the goal is simply to get close enough that the meter settles in the green in-tune zone. You do not need to chase perfect zero on every frame. A calm, centered reading matters more than a number flickering between tiny values.
If the tuner keeps jumping between notes, the first cause is usually not the algorithm. It is the signal. A microphone tuner works best when you play one clean note at a time in a quiet room. Chords, sympathetic strings, background videos, ceiling fans, and room echo all make a browser tuner less stable. Fresh plucks usually read better than weak sustain. Low notes on bass can take slightly longer to settle, especially on phones with small microphones. Harmonics can also trick the display if you touch the string lightly or pluck near a node. Another common issue is distance. If the phone or laptop is too far away, the tuner hears more room than instrument. Move closer to the sound hole, headstock, or amp at low volume. If you are using speakers on the same device, playback can bleed into the microphone and confuse the reading. That is one reason this page includes related tools like speaker test and headphone test: sometimes the real problem is your monitoring setup, not your tuning ear. When readings stay unstable, simplify the environment before assuming the note engine is wrong.
An online tuner is the fastest option when you need a free browser tool right now. It opens instantly, works across phones and laptops, and helps with note, hertz, and cents feedback without another app install. That convenience is why searches for online tuner, online guitar tuner, and web based tuner stay strong. A clip-on tuner has a different advantage: it reads vibration through the instrument, so it often performs better in noisy rooms or during rehearsals. A pedal tuner is even more dependable in live or amplified setups where silent muting, bright stage visibility, and repeatable stability matter. None of that makes a browser tuner useless. It just defines the right job for it. This page is best for practice rooms, quick restringing, lesson prep, travel, and any moment when you want a chromatic tuner online without extra hardware. It is also a helpful teaching tool because it shows the note name, the measured frequency, and the cents direction together. That makes it easier for beginners to understand what a tuner is actually reporting instead of treating the result as a black box.
Tap Start tuner, allow microphone access, choose the right preset, and pluck one string at a time close to the device microphone. The page shows the nearest note, measured hertz, and cents direction so you can tune up or down.
Most unstable readings come from room noise, chords, weak sustain, or the microphone being too far away. Move closer, mute nearby audio, and play one fresh note at a time.
Cents show how far the detected pitch sits from the exact target note. Negative cents are flat, positive cents are sharp, and zero is the center.
A4 = 440 Hz is the standard concert reference for tuning. Changing it to another value shifts the note centers the tuner uses for all notes.
Yes. It works as an acoustic guitar tuner or electric guitar tuner as long as the microphone can hear one clear string in a reasonably quiet space.
Yes. The presets include standard bass, ukulele, and violin targets, and custom mode covers alternate setups.
It works on modern mobile browsers that support microphone access, including current Safari on iPhone and current Chrome on Android.
The tuner needs live audio input to detect pitch. It does not start the microphone until you choose to begin.
For everyday tuning in a quiet room, a browser tuner is usually accurate enough. In loud spaces or on stage, a clip-on or pedal tuner is often more reliable.
Yes. Use the reference pitch control to move A4 between 432 and 446 Hz, then the note mapping and cents guidance update immediately.