Applying for United States citizenship is a major step, and the official Form N‑400, Application for Naturalization is the gateway. With Formize’s fillable PDF you can complete the entire form directly in your browser—no extra software required.
Our online PDF filler loads the exact version of the USCIS N‑400 form, preserving the official layout while allowing you to type, select checkboxes, and attach digital signatures. When you’re ready, simply download the completed PDF and submit it to USCIS.
Form N‑400 is the United States Citizenship and Immigration Services (USCIS) document used by permanent residents to apply for naturalization. The form collects personal information, residency history, employment details, and answers to eligibility questions.
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 automatically. Follow the on‑screen prompts, save your progress, and export the finished document when you’re done.
After completing the form, print the PDF (or keep the digital copy) and mail it to the USCIS Lockbox address listed in the USCIS filing instructions. You can also submit the form online through the USCIS myUSCIS portal if you prefer a fully electronic filing process.
Need help? Review the USCIS official instructions for detailed guidance on each section.
No. With Formize’s online filler you can complete the form in any modern browser—no Adobe Acrobat or other PDF editor is required.
Yes. The PDF linked on this page is the exact file published by USCIS, ensuring your application meets the agency’s formatting standards.
Absolutely. The Formize app lets you save a draft locally or export a partially completed PDF, so you can continue whenever you’re ready.
You can open the exported PDF in any PDF editor to correct small errors, or simply re‑fill the form using the online filler and export a new version.
Print the filled PDF and mail it to the USCIS Lockbox address indicated in the form instructions, or upload the digital copy through the myUSCIS portal.
Yes. As of the latest USCIS guidelines, the filing fee is $725 (including the biometrics fee). Check the USCIS website for current amounts.
Form N‑400 is intended for lawful permanent residents applying from within the U.S. If you are abroad, you must follow the consular processing instructions on the USCIS site.
A copy of your green card, two passport‑style photos, tax transcripts, proof of residence, and any documents related to criminal history or military service, if applicable.
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