Formal:
* Todo estará bien. (This is the most literal translation and is generally the most formal option.)
* Todo saldrá bien. (This is a slightly more hopeful phrase, suggesting a positive outcome.)
Informal:
* Todo va a estar bien. (This is a more casual and comforting phrase, often used with friends or family.)
* No te preocupes, todo va a salir bien. (This is a more reassuring phrase, adding the element of "don't worry".)
* Ya verás que todo va a estar bien. (This emphasizes that things will turn out okay, even if it's not obvious right now.)
More specific:
* Tranquilo/a, todo se va a solucionar. (This focuses on things being solved, implying a problem that needs resolution.)
* No te preocupes, las cosas van a mejorar. (This emphasizes improvement and positive change.)
You can choose the phrase that best suits the specific situation and the level of formality you want to use.