Form N-400: Application for Naturalization
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JustFill is not affiliated with USCIS. This is an independent third-party tool to help you complete Form N-400. Always download the current blank form from the official source and verify your completed copy before signing or submitting. Official Form N-400 from USCIS
USCIS Form N-400, Application for Naturalization, is the application a lawful permanent resident (green-card holder) files to become a US citizen. It covers your eligibility basis, residence and travel history, employment, and the good-moral-character questions USCIS reviews. Most applicants qualify after five years as a permanent resident (or three years if married to and living with a US citizen). With JustFill you upload the blank USCIS N-400 PDF, the AI maps every field, and you complete and download it free online.
Form N-400 is the USCIS application for US citizenship through naturalization. JustFill makes the long form fillable in your browser. It asks for your biographic details, time as a permanent resident, trips outside the United States, residence and employment history, marital information, and a series of eligibility and good-moral-character questions. After filing, you attend a biometrics appointment and an interview that includes the English and civics tests before taking the Oath of Allegiance.
What each section of Form N-400 asks for. JustFill’s AI will detect these fields automatically when you upload the PDF — review the breakdown below so you know what to enter.
Whether you qualify under the 5-year rule, 3-year (married to a citizen) rule, military service, or another basis.
Legal name, any name change requested, A-Number, date and country of birth.
Addresses and jobs for the past 5 years.
Each trip abroad of 24 hours or more during the relevant period — affects continuous residence.
Current and prior marriages, and your spouse's immigration status.
Questions about arrests, taxes, and affiliations USCIS uses to assess eligibility.
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Official source: Form N-400 on USCIS’s website
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