Fillable N-400 Form – Application for Naturalization

The N-400, Application for Naturalization is the official United States Citizenship and Immigration Services (USCIS) form used by lawful permanent residents to apply for U.S. citizenship. Our fillable PDF version lets you complete the form directly in your browser—no printing, scanning, or PDF editor required.

What Is the N-400 Form?

The N-400 collects personal information, residence history, employment details, and background data needed to determine if you meet the statutory requirements for naturalization. It is the first step toward becoming a U.S. citizen.

Eligibility Requirements for Naturalization

• Be at least 18 years old.
• Have continuous residence as a lawful permanent resident for 5 years (or 3 years if married to a U.S. citizen).
• Demonstrate good moral character.
• Pass English language and U.S. civics tests (unless exempt).
• Show physical presence in the U.S. for at least 30 months out of the last 5 years.

How to Fill Out the Fillable N-400 PDF on Formize

Follow these simple steps to complete the form online:

1. Click the "Fill out this form" button on this page.
2. Wait a few seconds while the Formize PDF Filler app loads the official N-400 PDF.
3. Enter your information in each highlighted field. The filler automatically saves your entries.
4. Use the built‑in navigation pane to jump between sections quickly.
5. When all fields are complete, click "Review & Export" to generate a final, printable PDF.

Common Mistakes to Avoid When Completing N-400

• Incorrect edition date: Ensure the PDF you’re using matches the latest USCIS edition (check the bottom of each page).
• Leaving required fields blank: The Formize filler highlights empty mandatory sections before you can export.
• Mismatched signatures: Sign exactly where the form indicates; digital signatures are accepted if you print later.
• Submitting original documents: Only send copies unless USCIS specifically requests originals.

Where to Submit Your Completed N-400

After exporting the final PDF, you can either:

• File online through your USCIS account (recommended for faster processing).
• Mail the printed form to the appropriate USCIS Direct Filing Address listed on the USCIS website.

Having a clean, error‑free PDF speeds up the review process and reduces the chance of a Request for Evidence (RFE).