Online tuner
Online Guitar & Bass Tuner
Tune guitar or electric bass through your microphone, or use the reference tones below. The detector shows the nearest note, frequency, and cents of error.
Microphone tuner
Press start and play one note
Use one string at a time and let the note ring steadily. The needle shows pitch error in cents: negative is flat, positive is sharp.
Microphone access requires HTTPS (or localhost) and browser permission. Audio stays in the browser.
Guitar and bass reference tones
Use these buttons when microphone access is unavailable. Match the open string to the tone, listen for slow beating, and adjust until the beating disappears.
| String | Frequency | Instrument |
|---|---|---|
| Bass E1 | 41.20 Hz | Bass |
| Bass A1 | 55.00 Hz | Bass |
| Bass D2 | 73.42 Hz | Bass |
| Bass G2 | 98.00 Hz | Bass |
| Guitar E2 | 82.41 Hz | Guitar |
| Guitar A2 | 110.00 Hz | Guitar |
| Guitar D3 | 146.83 Hz | Guitar |
| Guitar G3 | 196.00 Hz | Guitar |
| Guitar B3 | 246.94 Hz | Guitar |
| Guitar E4 | 329.63 Hz | Guitar |
Standard guitar tuning: E A D G B E
From the thickest string to the thinnest, standard guitar tuning is E2, A2, D3, G3, B3, and E4. The interval between most neighboring strings is a perfect fourth; G to B is a major third. Tune upward to the target pitch to reduce slack at the tuning post.
Online electric bass tuner guide
A four-string bass uses E1, A1, D2, and G2. Because these frequencies are low, use the neck pickup, reduce distortion, and pluck near the twelfth fret for a clearer fundamental. Five-string bass commonly adds B0 below E1; six-string bass may also add C3 above G2.
Frequently asked questions
How do I tune a guitar online?
Allow microphone access, pluck one open string, wait for a stable note name, and adjust until the cents value stays close to zero. Move from the lowest string to the highest.
Can this tune an electric bass?
Yes. Use the bass reference frequencies E1, A1, D2, and G2. Low notes need a clean attack and a few extra moments for the detector to settle.
What do cents mean on a tuner?
One semitone equals 100 cents. A reading of −12 cents is slightly flat; +12 cents is slightly sharp. Within roughly 5 cents is generally a practical target.
Why does the tuner jump between notes?
Room noise, overtones, old strings, and a hard pick attack can confuse pitch detection. Pluck gently near the middle of the string and mute the other strings.
Is the microphone recording uploaded?
The included script analyzes audio locally in the browser and does not contain upload code. Your hosting platform and browser permissions still determine the final privacy environment.