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Free Online Guitar Tuner — Standard & Alternate Tunings
Use this free online guitar tuner to tune by microphone in your browser. Standard six-string tuning is E2 · A2 · D3 · G3 · B3 · E4. Switch to Drop D, DADGAD, Open G, Open D, or a custom tuning and see precisely how many cents each string is flat or sharp. The analog needle and center-now pitch graph share the same detected frequency.
STRING
Target note
—
Live frequency
—Hz
Target — Hz
Detected —
Tuning offset
— ¢
Waiting for a clear note
Deviation · ±50¢ · NOW centered● OFF
Reference note & volume
A4 = 440 Hz · E2–E5
Select a key to hear its note and frequency.
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Input & import
+ Add backing music
Choose a practice backing or upload your own. Use headphones when recording over it.
16 bars per preset · Original synthesized practice tracks.
Recording settings
Up to 5 minutes per recording. Import audio up to 5 minutes / 100 MB. Two layers play together from the start; set each volume before downloading the mix.
Download before leaving: recordings are kept only until this page is closed or reloaded.
Guitar tuning guide: standard, Drop D and common questions
How to tune a guitar online
Choose Guitar → Standard, allow microphone access, and pluck each open string separately. The tuner selects the nearest target string. You can also tap a specific string to lock it. A needle pointing left means flat; a needle pointing right means sharp. A centered needle means within about five cents of the target.
What frequencies should the open strings have?
With A4 = 440 Hz, the standard targets are E2 (82.41 Hz), A2 (110 Hz), D3 (146.83 Hz), G3 (196 Hz), B3 (246.94 Hz) and E4 (329.63 Hz). Your measured frequency updates as you tune.
How do I tune to Drop D?
Select Drop D. The lowest string becomes D2 (73.42 Hz); the five higher strings remain the same. The tuner measures the actual note against the chosen target, rather than always snapping to the nearest chromatic semitone.
Can I use another instrument?
Yes. The RecoTune music workspace includes bass, ukulele, violin-family instruments, an 88-key online piano and a recording studio.