Use when you're completely sure and want to emphasize your confidence in a statement.

Certainty Emphasis

Has a positive tone, suggesting something is the best or right choice.

Positive Connotation

Placing 'without doubt' at the end of a sentence can give extra impact to your assertion.

Used in law to express that something is proven to the highest level of certainty.

Implies that no other explanation or possibility can exist.

Mostly used in serious situations where mistakes can have major consequences.