Fillable N-400 Application for U.S. Citizenship PDF

Are you ready to become a U.S. citizen? The Form N-400 – Application for Naturalization – is the official paperwork you need to file with USCIS. Instead of printing, scanning, or editing a static PDF, use our Fill out this form button to launch the Formize PDF Filler app. The fillable version is fully searchable, saves your data automatically, and guides you through every section.

Why Choose the Fillable N-400 PDF?

The fillable version mirrors the exact layout of the USCIS N-400, but adds:

• Clickable fields that prevent data‑entry errors.
• Real‑time validation for dates, numbers, and required fields.
• Easy download of a completed PDF ready for electronic filing or printing.

How to Complete the Form with Formize

Follow the simple steps below – no PDF editor needed.

Common Mistakes & Tips for a Successful Submission

Even a small typo can delay your citizenship process. Here are the top pitfalls and how to avoid them:

• Incorrect residency dates: Double‑check the start and end dates for each address you lived in the last five years.
• Missing signatures: The Formize app highlights any unsigned sections before you download.
• Invalid passport numbers: Use the exact characters as shown on your passport; the validator will flag extra spaces.

Where to Get Help and Submit Your Application

If you need clarification, consult the USCIS N-400 Instructions. After completing the form, you can either upload the PDF through your USCIS online account or mail it to the address listed in the instructions.

Ready to start? Click the button below and let Formize do the heavy lifting.

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