たってEven if, Even though, No matter how

ても and たって both mean 'even if' or 'even though,' with the main difference being tone and formality. ても is widely used in both everyday speech and writing, while たって is more casual and emphatic, typically found in informal conversation. Aside from tone, their meaning is nearly identical, e.g., 行っても and 行ったって both mean 'Even if I/you/etc. go...'

These are two expressions that can look very similar, or even identical in some cases, as たって when used with nouns will become だって. As an overall guideline, だって is a casual expression used to express 'I hear (A)' or 'they say (A)', or as a colloquial 'because', while たって is one way to say 'even though (A)' or 'even (A)', similar to ても or でも.

にしても and たって are related in that たって is a more casual form of ても, meaning 'even if'. にしても could be rephrased as にしたって, which sounds more informal and emotional. For example, どこに行くにしても ('No matter where you go') can also be expressed as どこ行くにしたって.

Both express contrastive conditionals. たとえ〜ても is neutral or formal, e.g. たとえ雨に降られても気にしない 'Even if I get rained on, I won't care.' たって is casual and conversational, often used with emotional insistence, e.g. そんなこと言ったってしょうがないよ 'Even if you say that, there's nothing we can do.'

どうしても and たって are similar in that both express ideas like 'even' or 'no matter', but they are used differently. どうしても appears at the beginning of a sentence to convey 'no matter what'. For example, どうしても勝ちたい ('I want to win no matter what'). たって is a casual verb ending that functions like ても. In fact, どうしても can be expressed more colloquially as どうしたって.