Does this file my N-400 with USCIS?

No. You file online at my.uscis.gov, or print and mail the completed form. AttachKit fills and drafts it privately — most applicants use it to prepare a clean, reviewed copy before submitting.

When am I eligible to naturalize?

Generally after five years as a lawful permanent resident, or three years if you've been married to and living with a U.S. citizen the whole time — with continuous-residence, physical-presence and good-moral-character requirements. Military service has separate rules. Check the current USCIS N-400 eligibility guidance; this isn't legal advice.

Is my immigration data private here?

Yes — your A-Number, SSN and history fill on your device and are never uploaded to our servers. The PDF itself never leaves your browser; you can confirm it in your browser's network tab.

Immigration · N-400

Fill N-400 (citizenship application) — free

Form N-400 is the application lawful permanent residents file to become naturalized U.S. citizens. It runs about 20 pages — your residence and travel history, eligibility, and biographic details. AttachKit drafts the parts it can from your profile and keeps everything on your device while you work through it.

Who needs it: Green-card holders eligible to naturalize — generally after five years as a permanent resident, or three if married to and living with a U.S. citizen, plus military and other special categories.

Need a blank N-400? Download from the source, then drop it in below.

Save your details once — supported forms auto-fill

Save your name, address, and other common fields once. Then open the blank N-400 in the form filler below — AttachKit maps what it can from your saved profile, right in your browser with nothing uploaded.

Set up profile →

Why fill it here

Auto-fill your name, mailing address and date of birth from your saved profile.
Your A-Number, Social Security number and residence history fill on your device and are never uploaded.
Review and edit every field in the browser before you file — the N-400 is long and unforgiving of typos.
Pairs with I-90 (green-card renewal) and I-765 (work authorization) if you're managing more than one filing.

Fill your N-400 now

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N-400 questions, answered

General information, not legal or tax advice

This page is general information about a USCIS form. Immigration outcomes can be life-changing and error-sensitive — for advice on your case, consult a licensed immigration attorney or DOJ-accredited representative. AttachKit fills the PDF; you remain responsible for what's submitted.

Does this file my N-400 with USCIS?: No. You file online at my.uscis.gov, or print and mail the completed form. AttachKit fills and drafts it privately — most applicants use it to prepare a clean, reviewed copy before submitting.
When am I eligible to naturalize?: Generally after five years as a lawful permanent resident, or three years if you've been married to and living with a U.S. citizen the whole time — with continuous-residence, physical-presence and good-moral-character requirements. Military service has separate rules. Check the current USCIS N-400 eligibility guidance; this isn't legal advice.
Is my immigration data private here?: Yes — your A-Number, SSN and history fill on your device and are never uploaded to our servers. The PDF itself never leaves your browser; you can confirm it in your browser's network tab.

More forms: I-485 · DS-160 · I-130 · I-864 · I-9 · Browse all 54 forms →