Although "it is I" qualifies as the most correct in terms of grammar, in normal conversation people do not say this. If I should say, "It is I," then someone might consider me slightly strange. At the same time, students taking tests in some countries suffer at the mercy of strict grammarians, and so everyone should remember that "it is I" remains the safer answer.

There is no difference. It is I = classical English and is rarely used today. It is me = modern English. Use this one.

Privet, try this page: http://www.dailywritingtips.com/its-me-vs-it-is-i/ good luck

The traditional grammar rule states when a pronoun follows a linking verb, such as is, it should be in the subject case. That means it is correct to say, “It is I". Some grammarians would say "It is I" is extinct, though. For them "It is me" is acceptable in informal English.

Use "it is me".This sounds familiar. Technically "it is I" is correct - something about a subject pronoun following a copula - but saying "it is I" sounds as if you want everyone to bow down before you.