Fillable N-400 Application for US Citizenship

Applying for United States citizenship is a major step, and the USCIS N-400 form is the official paperwork you need. Our fillable PDF lets you complete the entire application online, without printing, scanning, or using a separate PDF editor.

Why Use the Fillable N-400 PDF?

The fillable version mirrors the exact layout of the government‑issued N-400 PDF, ensuring every field is correctly placed. Benefits include:

• Instant validation of required fields
• Automatic saving so you never lose your progress
• Easy printing or direct upload to USCIS

How to Complete the Form with Formize

Instead of downloading the PDF and opening it in a separate editor, simply click the "Fill out this form" button on this page. The Formize PDF Filler app will load in seconds, and you can start typing right away.

Common Mistakes & Tips for a Smooth Submission

• Incorrect personal information – double‑check your name, DOB, and alien registration number.
• Leaving required fields blank – the filler highlights missing data before you can save.
• Using the wrong document version – this is the latest 2024 N-400 edition.
• Forgetting signatures – you can add an electronic signature or print to sign.

Where to Get Help and Submit Your Application

If you need guidance, the USCIS website offers detailed instructions for each section of the N-400. After completing the form, print it, sign it, and mail it to the address listed in the USCIS filing guide. You can also submit electronically through the USCIS online portal if you prefer.