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N-400, Application for Naturalization
Naturalization is the process to become a U.S. citizen if you were born outside of the United States. If you meet certain requirements, you may become a U.S. citizen either at birth or after birth. Use this form to apply for U.S. citizenship. Check your eligibility.
File Online
In the video below, you can learn how to use your online account to check your eligibility for naturalization, complete the online form, upload evidence, and pay your fee. You’ll also learn how to track and manage your case after filing. To review specific chapters, please see our How to File Your Application for Naturalization Online Video webpage.
Check Eligibility 
What This Form Can Help You Do
Become a U.S. Citizen Through Naturalization
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