Fill out your USCIS form, free and step by step
Answer simple questions in English or Spanish. I explain each one with the official instructions and, at the end, you get the official form filled in, ready to review, sign and file.
N-400 · Application for Naturalization
To become a U.S. citizen.
Edition 01/20/25 · the one USCIS accepts now
More forms
Coming once the N-400 is complete.
How it works
- One question at a time, with the official wording of the form and a plain explanation.
- Your answers stay in your browser: they are not sent to GreenBro. Nothing is saved unless you choose to, encrypted with your own password.
- At the end you download the official PDF filled in, to review, sign by hand and mail; or you follow the guide to file it online in your own USCIS account, with your answers ready to copy.
GreenBro is a free self-help tool. It is not a law firm, an immigration consultant or a "notario", and it is not affiliated with USCIS. It does not give legal advice: you are responsible for your answers and must review the form before signing it. The official instructions, edition and fees published by USCIS prevail. If your situation is delicate, talk to an attorney or an accredited representative: find legal services (USCIS).