Our tuner works through a microphone on your device, and the instrument range you can tune-up with our online guitar tuner tool is endless: acoustic, bass, electric, ukulele, etc. What we’ve created (and here's the best part,) is a hands down free online guitar tuner so you can easily tune up your guitar. Hz Online Tuner For Your String InstrumentsĪ mountain of online guitar tuners could be found on the internet, and all of them allow you to tune up your guitar by playing notes and listening carefully to the pitch.