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Form N-400
Application for Naturalization
Issued byUSCIS
Edition01/20/25
Pages–
Fillable fields–
The blank form comes from our site. Everything you type stays in your browser — nothing is uploaded.
Your A-Number appears at the top of every page: type it once and all 14 pages are filled. Read the official instructions for each question before you answer.
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What is Form N-400?

Form N-400 is the application a lawful permanent resident (green card holder) uses to apply for U.S. citizenship through naturalization.

Who fills it in, and where does it go?

Permanent residents who meet the eligibility requirements complete it and file it with USCIS. USCIS also accepts this form online through a USCIS account. Check the official page for eligibility, fees and the documents to include.

How to fill it here

Click the boxes and type your answers page by page. Your A-Number is entered once and copied to the top of all 14 pages. Download the filled PDF, review every answer and sign where the form asks.

Common mistakes

Frequently asked questions

Do I have to type my A-Number on every page?

No. Type it once — it is copied into the header of all 14 pages automatically.

Can I file Form N-400 online instead?

Yes, USCIS accepts it online through a USCIS account. This page is for completing the paper form.

Is my information uploaded?

No. The form is filled inside your browser; nothing leaves your device.

Doctor PDF is not affiliated with the IRS or USCIS. This page offers the official blank form, unchanged, and a private way to fill it in your browser. It is not legal or tax advice — always follow the official instructions.