Forms I-94 and I-94W (for nonimmigrants with a visa waiver) record the arrival and departure dates of people visiting the U.S.
Everyone entering the U.S. needs an I-94 or I-94W form except:
Customs and Border Protection (CBP) typically issues Form I-94 electronically.
With the CBP One app or I-94 website, you can also:
Customs and Border Protection (CBP) sends visitors email reminders about their remaining time in the U.S. In addition, it sends notifications to travelers who may have exceeded their admission period.
In most cases, your departure from the U.S. will be recorded electronically, whether you are traveling by air, land, or sea.
Citizens of Visa Waiver Program countries must have an approved and current authorization through the Electronic System for Travel Authorization (ESTA) to apply for their I-94W in advance. You can apply through the official I-94 website or the CBP One app.