What Form N-400 is
Form N-400, Application for Naturalization, is the form a lawful permanent resident (green-card holder) files to apply to become a US citizen. It is a long form that asks about your background, residence, travel, and eligibility, and it is the first step in the naturalization process.
You fill it out, sign it, and file it with USCIS. AnyPDFfiller helps you complete and sign the PDF; you submit the finished form to USCIS yourself.
Who can file it
Naturalization has eligibility rules set by USCIS. In general terms, most applicants are permanent residents who have:
- held a green card for a required number of years (commonly five, or three if married to and living with a US citizen);
- met continuous-residence and physical-presence requirements;
- good moral character;
- a basic command of English and US civics (with some exceptions).
The exact rules and exceptions are on the USCIS site — check that you qualify before you file.
How to fill the N-400 with AnyPDFfiller
Download the current Form N-400 from the USCIS website and upload the PDF here. Because it is long, filling it on screen — where every field is listed beside the page — is faster and neater than by hand. Work through each section, add your signature, and download the completed PDF to file with USCIS.
Fee, timing, and where to file
The N-400 filing fee, biometrics requirements, current processing times, and filing location can change and depend on how you file (online or by mail). Confirm the current fee and address on the official Form N-400 page at uscis.gov before submitting.
N-400 questions people ask
What is the N-400 for?
It is the application a green-card holder uses to request US citizenship through naturalization.
Where do I get a blank N-400 PDF?
Download the latest edition from uscis.gov, then upload it here to fill it. Filling on screen keeps a long form legible and easy to review.
Can I save and finish it later?
Yes — with a saved project you can come back to a long form like the N-400 instead of completing it in one sitting. See saving your project.
Can I sign it online?
Yes — add your signature, then download the signed PDF. A printed copy of your signed form is accepted when filing by mail.
Is filling it online free?
Completing and downloading the N-400 costs nothing here; only the watermark-free copy is a paid feature. Any USCIS filing fee is separate and paid directly to USCIS.
AnyPDFfiller is an independent tool for filling PDFs — not a government site, not affiliated with USCIS, and not a source of legal advice. Whether you qualify to naturalize is decided by USCIS, so rely on the official N-400 instructions or a licensed immigration attorney for your own situation.
