Tuner
Free online tuner that uses your microphone. Tunes guitar, bass and ukulele in standard and dozens of alternate tunings, or any instrument in chromatic mode. No sign-up.
About the tuner
This tuner listens through your microphone and matches the pitch it hears against the note it thinks you’re aiming for, in real time. It works for anything with strings — guitar, bass, ukulele, violin, banjo — and for anything else too, since the chromatic mode just tells you the nearest note and how far off it is, no instrument-specific tuning required.
How to use it
- Pick your instrument, then a tuning for it (standard, drop D, open G, and many more), or build a custom one.
- Tap “Start tuner” and allow microphone access.
- Play a string. In auto-detect mode the tuner figures out which string you’re playing; in manual mode, pick the string yourself first.
- Watch the readout and the trail graph — a line along the center band and a green readout mean in tune. Each string is marked once it has held steady in tune.
- Switch to open tuner mode for a plain chromatic readout instead of a fixed string set.
Tips for a cleaner reading
- Tune in a quiet room — background noise and other instruments confuse the pitch detector.
- Pluck or bow the string so it rings clearly, then hold still rather than re-plucking constantly.
- On a phone, hold it close to the instrument rather than across the room.
- If detection feels jumpy, try the Settings panel’s sensitivity control before assuming it’s wrong.
Tuning reference
Strings are listed from the lowest-pitched to the highest (ukulele is the exception: its G is tuned higher than the C next to it, but it’s still listed first).
Guitar
| Tuning | Strings |
|---|---|
| Guitar · Standard | E A D G B E |
| Guitar · Half step down | D♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar · Whole step down | D G C F A D |
| Guitar · Step and a half down | C♯ F♯ B E G♯ C♯ |
| Guitar · Two steps down | C F A♯ D♯ G C |
| Guitar · Drop D | D A D G B E |
| Guitar · Drop C♯ | C♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar · Drop C | C G C F A D |
| Guitar · Drop B | B F♯ B E G♯ C♯ |
| Guitar · Drop A | A E A D F♯ B |
| Guitar · Double drop D | D A D G B D |
| Guitar · Open G | D G D G B D |
| Guitar · Open D | D A D F♯ A D |
| Guitar · Open D minor | D A D F A D |
| Guitar · Open E | E B E G♯ B E |
| Guitar · Open A | E A E A C♯ E |
| Guitar · Open C | C G C G C E |
| Guitar · DADGAD | D A D G A D |
| Guitar · All fourths | E A D G C F |
| Guitar · New Standard (Fripp) | C G D A E G |
| Guitar · Nashville (high-strung) | E A D G B E |
| Guitar (7-string) · Standard | B E A D G B E |
| Guitar (7-string) · Drop A | A E A D G B E |
| Guitar (7-string) · Half step down | A♯ D♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar (7-string) · Drop G | G D G C F A D |
| Guitar (8-string) · Standard | F♯ B E A D G B E |
| Guitar (8-string) · Drop E | E B E A D G B E |
Bass
| Tuning | Strings |
|---|---|
| Bass · Standard | E A D G |
| Bass · Half step down | D♯ G♯ C♯ F♯ |
| Bass · Whole step down | D G C F |
| Bass · Drop D | D A D G |
| Bass · Drop C | C G C F |
| Bass · Piccolo (octave up) | E A D G |
| Bass (5-string) · Standard | B E A D G |
| Bass (5-string) · High C | E A D G C |
| Bass (5-string) · Half step down | A♯ D♯ G♯ C♯ F♯ |
| Bass (6-string) · Standard | B E A D G C |
Ukulele
| Tuning | Strings |
|---|---|
| Ukulele · Standard (GCEA) | G C E A |
| Ukulele · Low G | G C E A |
| Ukulele · D tuning (ADF♯B) | A D F♯ B |
| Ukulele · Baritone (DGBE) | D G B E |
FAQ
How do I tune a guitar with this online tuner?
Choose “Guitar” and then “Standard” in the menus, press “Start tuner” and allow the microphone. Pluck the low E string and watch the trail: if the line sits below the center the string is flat, so tighten the tuning peg; if it sits above center it’s sharp, so loosen it. When the line holds in the middle band and the readout goes green, move on to the A string, and so on up to the high E. Then run through all six once more, since tightening one string nudges the others.
What are the standard guitar string notes?
From the thickest string to the thinnest, standard tuning is E, A, D, G, B, E. Bass is E, A, D, G, and a standard ukulele is G, C, E, A. Guitars with 7 or 8 strings and basses with 5 or 6 are covered by the number-of-strings option in Settings.
Does this tuner work on a phone?
Yes. It runs in any modern browser on iPhone, Android or desktop. Allow microphone access when asked, and hold the phone close to the instrument for the cleanest reading.
Is my audio recorded or uploaded?
No. The pitch is worked out on your device as you play, and nothing is recorded or sent anywhere. See the Privacy Policy for details.
Nothing happens when I play a note.
Check that your browser actually granted microphone access — look for a blocked-mic icon in the address bar. If it’s allowed and still silent, make sure no other app (a video call, another tab) is holding the microphone.
Is the tuner available in other languages?
Yes — with the tuner itself translated too: Stimmgerät online (German), Afinador online (Spanish), Gitaar stemmer online (Dutch), Stroik online (Polish), Онлайн-тюнер (Russian) and Stem gitar online (Indonesian).
Can I tune a bass or a ukulele?
Yes — pick Bass or Ukulele from the instrument menu, or go straight to the bass tuner or ukulele tuner (there’s a guitar tuner page too). For anything else (a banjo, a violin, a five-string bass), use a custom tuning or open tuner mode. Once you’re in tune, the Chord Chart shows how to play any chord.
Can I tune to something other than A440?
Yes — the Settings panel lets you set a different reference pitch for A4, for instruments tuned to an orchestra or a recording.
What’s the difference between “by string” and “open tuner” mode?
By-string mode checks each string against a fixed tuning and tells you which one you’re closest to. Open tuner mode skips the fixed string list entirely and just names whatever note it hears — useful for instruments or tunings this tool doesn’t list by name.