N-400 form template
With the traditional set of features for viewing and filling out a PDF document, combined with the benefits of a web application and responsive layout, you can complete N-400 form in minutes.
Fillable N-400 Application for Naturalization
- Language English
- Country USA
- Activity Immigration
- Department USCIS
The N-400, Application for Naturalization is the official USCIS form used by lawful permanent residents to become U.S. citizens. Our fillable PDF version lets you complete the entire application directly in your browser—no extra software required.
What Is the N-400 Form?
The N-400 collects personal information, residency history, employment, travel, and moral character details. It also includes sections for English and civics test exemptions, medical certifications, and supporting documents.
How to Fill Out the N-400 Online
Simply click the “Fill out this form” button below. The Formize PDF Filler loads instantly, allowing you to type, select, and navigate each field just like a web form. All changes are saved automatically.
Common Mistakes to Avoid
- Using lowercase letters or fancy fonts – USCIS requires capital letters.
- Leaving any required field blank – the filler highlights missing information.
- Submitting outdated edition dates – make sure the PDF shows the current edition (01/20/25).
- Uploading non‑English documents without certified translations.
Eligibility & Filing Requirements
Before you start, confirm you meet one of the standard eligibility paths: 5 years of continuous residence, 3 years if married to a U.S. citizen, or qualifying military service. Gather your Green Card, marriage certificates, tax records, and any supporting evidence.
Download the Official PDF
For reference or offline completion, you can download the official USCIS version of the N-400 form. Our fillable version mirrors the exact layout, so you can print it later if you prefer mailing your application.
Is the N-400 form available as a fillable PDF?
Yes. Formize provides a fillable version that mirrors the official USCIS PDF, allowing you to complete it online without extra software.
Can I submit the N-400 online through Formize?
Formize lets you fill out and download the completed PDF. You still need to submit the paper form to USCIS by mail or use the USCIS online portal for filing.
Do I need a PDF reader to use the fillable form?
No. The Formize PDF Filler runs completely in your web browser, so no Adobe Reader or other PDF software is required.
What if I make a mistake after I’ve saved the form?
You can reopen the saved PDF in the Formize filler, edit any field, and re‑save the document before final submission.
Is the fillable N-400 form free?
Yes. Downloading and completing the fillable N-400 via Formize is completely free. USCIS filing fees still apply when you submit the application.
How do I know I have the latest version of the N-400?
The PDF we provide is linked to the current USCIS edition (01/20/25). Always check the edition date at the bottom of the form to confirm it matches the latest USCIS release.
Can I use the fillable form on a mobile device?
The Formize filler is responsive and works on smartphones and tablets, though typing may be easier on a desktop or laptop.
How to fill out N-400 form for free, online in 4 easy steps:
- 1Open the Fillable N-400 FormClick the “Fill out this form” button below. The Formize PDF Filler loads instantly in your browser.
- 2Enter Your InformationType directly into each field. The form auto‑saves as you go, so you never lose your progress.
- 3Review & ValidateUse the built‑in validation tools to check for missing or incorrectly formatted answers before finalizing.
- 4Download or SubmitWhen you’re done, download the completed PDF or print it for mailing to USCIS. You can also save a copy for your records.
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