Guitar Tuner Online
Tune your guitar with your microphone — the tuner hears which string you pluck, tells you which way to turn, and checks off each string as it lands. Free, no app, nothing recorded.
Tap a peg to hear its note and start tuning — the browser will ask for mic access once. Sound is analyzed on your device, never uploaded.
How to Tune a Guitar Online
Standard tuning, string by string, in about a minute.
Allow the Microphone
Press Tune my guitar and allow mic access when the browser asks. Everything runs on your device.
Pluck One String
Play any string and let it ring — the tuner recognizes which one it is and shows how far off it sits.
Turn Until It's Green
Follow the tune up / tune down hint. When the needle centers and turns green, hold it a moment — the peg gets a check. Six checks and you're done.
A Tuner That Does the Thinking
Auto string detection, plain-language directions, green when done.
Knows Which String You Hit
Pluck any string and the tuner recognizes it automatically — no clicking through E-A-D-G-B-E by hand. Tap a peg to lock one if you prefer.
Tune Up or Tune Down, Told Plainly
No decoding a wobbling dial: the readout says which way to turn the peg, and the needle goes green when the string lands within 5 cents.
Six Green Checks
Each string you finish gets a check mark on its peg, so you always know what's left — and when the whole guitar is done.
Reference Tones Included
Every string can play its target pitch out loud — tune the old-school way by ear, or double-check what the needle is telling you.
Nothing Is Recorded
The mic signal is analyzed on your device, frame by frame, and discarded. Nothing is stored or uploaded — it's a tuner, not a recorder.
Works on Mobile
Tune from your phone at rehearsal, on the couch, or backstage — iOS, Android, Chrome, Firefox, Safari, and Edge.
A Tuner, Not a Recorder
The microphone signal is analyzed on your own device, frame by frame, and thrown away. No audio is recorded, stored, or uploaded — and the mic switches off the moment you press Stop.
No Recording
Frames are analyzed and discarded
No Upload
The analysis runs in your browser
You're in Control
Stop ends mic access instantly
Every Time a Guitar Needs Tuning
Which, as every guitarist knows, is every time you pick it up.
Acoustic & Electric
Works with any guitar your mic can hear — unplugged or through a small amp
Before You Record
Thirty seconds of tuning saves a take you can't fix later
Band Practice
Get everyone to the same A 440 before the first song
Beginners
The tuner says tune up or tune down in words — no theory needed
No Gear on Hand
Forgot the clip-on? Any browser becomes your backup tuner
Ear Training
Guess by ear first, then let the needle grade your guess
Standard Tuning, Explained While You Tune
A guitar in standard tuning runs E2 A2 D3 G3 B3 E4, from the thickest string to the thinnest — the low E at 82.4 Hz, the high E two octaves up at 329.6 Hz, everything referenced to A4 at 440 Hz. That’s the tuning nearly every song, lesson, and chord chart assumes, which is why a guitar that’s “a little off” makes even perfect playing sound wrong. This tuner hears which string you pluck, measures it in cents, and walks you to center, string by string.
Why the tuner says up or down instead of showing a dial
A classic tuner dial makes you translate: needle left of center means flat, which means… tighten? This one just tells you — tune up or tune down — and keeps the needle as confirmation. Turn slowly, pluck again, and when the string lands within five cents of target the readout turns green. Hold it there a moment and the string’s peg gets a permanent check, so a full tune-up becomes a visible six-step checklist instead of a guessing game.
Getting a clean reading on every string
Pluck one string at a time and let it ring — chords can’t be tracked, and a fresh firm pluck reads better than a dying one. The low E is the trickiest string for any microphone tuner because so much of its energy is in the overtones; plucking it over the 12th fret, or a touch harder than usual, locks it in. If the room is noisy, get the guitar closer to the mic. And when a string is way off — a new string, or one that dropped a whole step — the auto-detect might briefly think you meant the neighboring string; tap the right peg to lock it and tune on.
By needle or by ear
Every peg can also play its reference tone — the exact pitch that string should sound. Tuning by ear against a reference is a skill worth building (it’s how guitarists tuned for decades), and having the needle underneath means you can check your ear’s work as you go. If you want to explore the pitch side further, the pitch detector shows any sound’s exact frequency, and the note identifier names whatever note you play.
Other instruments in the case
The same tuner covers the rest of the band: bass, ukulele, violin, cello, mandolin, and banjo — each with its own strings and reference tones. And once you’re in tune and recording, the online audio editor takes it from there.
In Tune? Hit Record
The full Notevibes Online Audio Editor records your playing, cleans up room noise, detects key and tempo, and exports to MP3 or WAV — all in your browser.
Free to try · No credit card required
Related Audio Tools
More free AI audio tools from Notevibes — same engine, no sign-up.
Drop D Tuning
Tune to D A D G B E — one string down, big low end.
Half Step Down Tuning
Tune to Eb standard — every string one semitone down.
Bass Tuner
Tune a 4-string bass (E A D G) with your mic.
Ukulele Tuner
Tune G C E A with your mic, string by string.
Pitch Detector
Read the live pitch of any sound — Hz, note, and cents.
Note Identifier
Sing or play a note and see its name instantly.
Guitar Tuner FAQ
How do I tune my guitar with this online tuner?
Press the button, allow microphone access, and pluck a string. The tuner recognizes which string you're playing, shows how far off it is, and tells you to tune up or down. Turn the peg slowly until the needle centers and turns green, let it hold for a moment, and the string gets a check mark. Repeat for all six.
What tunings does it support?
Standard tuning (E2 A2 D3 G3 B3 E4, referenced to A4 = 440 Hz) plus the most-used alternates — pick Drop D, Half Step Down (Eb), DADGAD, Open G, Open D, Drop C, or D Standard from the pills above the pegs. Each alternate tuning also has its own page explaining how it works and how to get there from standard.
Does it work for both acoustic and electric guitars?
Yes. Acoustic guitars work directly. For electric, either play acoustically close to the mic (it's quiet but enough), or put a small amp near your device. The tuner only needs to hear one clear string at a time.
How accurate is it?
The needle reads in cents — hundredths of a semitone — and counts a string as in tune within ±5 cents, which is tighter than most ears can hear and on par with clip-on tuners. For best results, pluck one string at a time and let it ring.
Why doesn't it react when I pluck a string?
Usually it's the mic: check that access was allowed and that background noise isn't drowning the guitar. Pluck a single string firmly and let it ring — strummed chords have many pitches at once and can't be tracked. On the low E, plucking near the 12th fret gives a cleaner reading.
Is anything recorded or uploaded?
No. The sound is analyzed on your own device in real time and discarded frame by frame — nothing is recorded, stored, or sent to any server, and the mic switches off when you press Stop.
Is it free?
Completely free — no account, no app to install, no limits. It runs entirely in your browser and only asks for microphone permission, which you can revoke at any time.