Fill in Form N-400 online
Applies for US citizenship.
Do not sign this form electronically. Form N-400 has to be signed by hand, in person or through the agency’s own filing system. You can type your details into the PDF here, then print it and follow the official instructions to sign and submit it.
Form N-400 at a glance
- Official name
- Application for Naturalization
- Issued by
- USCIS
- Country
- United States
- Category
- Immigration and visas
- Language
- English
- Who uses it
- Lawful permanent residents (green-card holders) who meet the eligibility requirements.
- Signature
Print and sign by hand
USCIS requires a handwritten signature on paper filings. Under a USCIS rule in force since 10 July 2026, typed names, pasted signature images and signatures made with e-signature software are not valid; a scan or copy of an original wet-ink signature is accepted, and electronic signatures count only when you file online through a USCIS account.
- Instructions
- Official USCIS page
Form N-400 is the application for US citizenship through naturalization, used by lawful permanent residents who meet the residence and other requirements. You can file it online or on paper. Open the official form from uscis.gov in BunnyDoc's free Sign PDF tool straight from this page, type your details into its fillable fields and download it to print and sign by hand. The file is handled in your browser and never leaves your device.
How to fill in Form N-400
Check eligibility and the edition
Use the USCIS N-400 page to check the accepted edition and the eligibility rules, such as the usual 5 years as a permanent resident, or 3 years if married to a US citizen. Then open n-400.pdf in Sign PDF.
Eligibility and information about you
Tick the basis of your eligibility, then give your names, A-number, green card date, and biographic details.
Addresses, marital history, children and travel
List your addresses and employment or schooling for the period the form asks for, your marital history, your children, and every trip outside the US of more than 24 hours.
Answer the eligibility questions
Answer every yes or no question about things such as taxes, arrests, and support for the Constitution. Explain any yes answer as the form directs.
Print and sign by hand
Download the form, print it and sign the applicant's signature section in ink. You will also sign again at your interview.
File with USCIS
File online through a USCIS account, or mail the signed form, fee and copies of your green card to the address on the USCIS N-400 page.
What you need before you start
- Your green card and A-number.
- Your address, employment and travel history for the period the form asks about.
- Marriage, divorce and children's details.
- Records of any arrests or court cases.
- The current fee from the USCIS fee schedule, and details of any reduced fee you qualify for.
Can I sign Form N-400 electronically?
No, not on a paper filing. A USCIS rule on signatures on immigration benefit requests, in force for filings made on or after 10 July 2026, says a valid signature on a paper form is a handwritten one. Typed names, copied signature images, stamps and signatures created with e-signature software are invalid, and USCIS can reject or even deny a request because of them, keeping the fee in the case of a denial. A scan, photocopy or fax of a form that carries an original wet-ink signature is accepted.
So type your answers into Form N-400 with BunnyDoc, download it, print it, and sign it by hand in ink. If you file online through a USCIS online account instead, you sign electronically inside that system. For background, see whether e-signatures are legal.
Common mistakes
- Filing too early. USCIS allows filing up to 90 days before you meet the continuous residence requirement, not earlier.
- Missing trips abroad from the travel list.
- Not disclosing an arrest or citation, even one that was dismissed.
- Leaving out copies of both sides of the green card.
Form N-400: frequently asked questions
Where do I send Form N-400?
If you file on paper, mail it to the lockbox for your state shown on the USCIS N-400 page. Military applicants use a separate address.
Can I file Form N-400 online?
Yes. USCIS accepts N-400 online through a USCIS account, and you sign electronically there.
Can I sign Form N-400 electronically?
Not on a paper filing. USCIS requires a handwritten signature on paper forms.
How much is the N-400 fee?
Fees differ for online and paper filing and change from time to time, and some applicants qualify for a reduced fee. Check the USCIS fee schedule.
What happens after I file?
USCIS sends a receipt, may schedule a biometrics appointment, and then invites you to an interview with the English and civics tests.
Is BunnyDoc connected to USCIS?
No. BunnyDoc is not affiliated with USCIS or the US government. We link to the official form on uscis.gov and give you a free tool to fill it in your browser.
BunnyDoc is not affiliated with USCIS. Always download the latest edition from the official site and follow its instructions for signing and filing.
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