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In tune. Now learn a song.
We recommend Guitar Tricks for step-by-step lessons, real songs, and a guided path from beginner fundamentals to advanced techniques.
Try Guitar Tricks free for 14 daysFree Guitar Tuner
Tune your guitar online for free with microphone pitch detection. Use Standard EADGBE, Drop D, open tunings, half step down, bass tunings, and custom note setups without creating an account or downloading an app.
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Tune for Free Before You Play
The tuner works directly in the browser, so you can get back to practicing, recording, or playing along without setting up extra gear.
Free in your browser
Open the tuner, allow the microphone, and tune. There is no account gate or paid version to unlock the basic tuner.
No app download
Use the same tuner on iPhone, Android, tablet, or desktop without installing another app just to tune before playing.
Microphone pitch detection
The tuner listens for the string you play and shows whether you are sharp, flat, or centered on the target note.
Affiliate disclosure: we earn a commission if you sign up, at no extra cost to you.
Free Tuners for Common Guitar Setups
Start with standard tuning or jump to the free tuner page that matches the song, instrument, or custom setup you are using.
Standard Guitar Tuning
E-A-D-G-B-E for everyday guitar, lessons, tabs, chords, and most songs.
Drop D Tuning
Lower the sixth string to D for riffs, heavier rhythm parts, and one-finger power chords.
Half Step Down Tuning
Eb-Ab-Db-Gb-Bb-Eb for lower vocal keys, looser string tension, and classic rock songs.
Custom Guitar Tuner
Build a free tuner for any set of notes, extended range guitars, or saved custom tunings.
How to Use the Free Guitar Tuner
- 1Choose Standard tuning or the alternate tuning you need.
- 2Allow microphone access when your browser asks.
- 3Play one guitar string clearly and let the note ring.
- 4Tighten the tuning peg if the note is flat, or loosen it if the note is sharp.
- 5Repeat for each string, then recheck the first string once the guitar settles.
Free Guitar Tuner FAQ
- Is this guitar tuner really free?
- Yes. GuitarTuner.io is free to use in your browser. You can tune with the microphone tuner without creating an account, paying for an upgrade, or installing an app.
- Do I need to download anything?
- No. Open the free guitar tuner in your browser, allow microphone access, and tune one string at a time. It works on phones, tablets, and desktop browsers.
- How does the free guitar tuner hear my guitar?
- The tuner uses your browser microphone permission to detect pitch in real time. Play one string clearly and the tuner shows whether the note is sharp, flat, or in tune.
- What tunings can I use for free?
- You can tune to Standard EADGBE, Drop D, Drop C, Half Step Down, Open G, Open D, DADGAD, bass tunings, 12-string tuning, and custom note setups.
- Can I use this free tuner on an electric or acoustic guitar?
- Yes. The tuner works for acoustic guitar, unplugged electric guitar, and bass. For electric guitar, use a clean signal or tune unplugged so the microphone gets a clear pitch.