The N-400 is the official Application for Naturalization used by the United States Citizenship and Immigration Services (USCIS). A fillable PDF lets you type directly into the form, reduces errors, and speeds up processing.
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 loads in your browser, giving you a clean, interactive workspace.
Follow the step‑by‑step guide below to finish your application online.
After you have saved the completed N-400, print it, sign the hard copy, and mail it to the USCIS lockbox address listed in the form instructions. You can also submit the electronic version through your USCIS online account if you prefer.
Review the official USCIS instructions included with the PDF or visit the USCIS N-400 page for detailed guidance.
Yes. USCIS provides a fillable PDF version of the N‑400, which can be completed online using tools like Formize PDF Filler.
USCIS requires a handwritten signature, so you must print the completed form, sign it, and then mail it. Some cases allow electronic submission through your USCIS account.
Formize automatically saves your work while you fill out the form. You can download the partially completed PDF and return to it at any time.
Cross out the error neatly, write the correct information, and initial the change. For major errors, it’s best to start a new form.
The PDF linked on this page is the current version from USCIS (as of 2024). Always check the USCIS N‑400 webpage for updates.
Yes, there is a filing fee. Check the USCIS website for the most up‑to‑date fee schedule and payment methods.
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