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Keeping your guitar in tune is very important. Some time, your guitar may be will go out of tune, so you will need to tune your guitar.
THESE ONLINE GUITAR TUNERS MAYBE WILL HELP YOU.
GuitarTuna: Guitar, Bass tuner-App for Apple products and also for Android - Free and accurate.
JamPlay guitar tuner-a Flash based reference and digital tuner if you have a line-in. This one uses Flash, so it won't perform too well on mobile devices.
Online Guitar Tuner - Accurate, picks up the sound of your guitar, but also uses Flash.
GuitarTricks guitar tuner - an online reference tuner, uses HTML5