Guitar tuner
Online tuner using your microphone for acoustic guitar, electric guitar, bass and ukulele, with standard and alternate tunings.
Tune your guitar.
Allow the microphone and play one string at a time, somewhere quiet.
Click start and allow the microphone.
Available in: 
Guitar tuner: what it is for
The tuner listens to the string through the microphone and shows the note and whether it is sharp or flat, with an easy-to-read needle. It has standard and alternate tunings for each instrument, and the reference A can be adjusted.
The sound is analyzed on your device and is not recorded.
How to use
- Choose the instrument and tuning.
- Allow the microphone and play a string.
- Tighten or loosen until the needle is centered.
When to use it
- Tune before playing or rehearsing.
- Alternate tunings.
- Tune without a physical tuner.
Frequently asked questions
What is standard guitar tuning?
From the thickest string to the thinnest: E, A, D, G, B, E. It is the same on acoustic and electric guitar.
How do I use the tuner?
Play an open string. If the needle is on the left, the string is flat: tighten the tuning peg. If it is on the right, it is sharp: loosen it. When it is in the middle and green, it is in tune.
What about the cavaquinho?
The most common tuning in Brazil is D, G, B, D, from the top string down. Choose “Cavaquinho” in the list.
Is the sound sent anywhere?
No. The sound is analyzed on your device.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.