fyllyoYes/no questions the documents never ask
Notes that say “never arrested” or “never served in the military” don’t answer the questions about weapons training or detention sites. Software often turns that silence into a “No”.
IMMIGRATION FORMS · USCIS · BUILT IN
Fill Form N-400 with AIApplication for Naturalization
Add the intake and the applicant’s records. Fyllyo fills Form N-400 on your Mac, shows the lines behind each answer and leaves anything the documents don’t answer for you, with the reason.
Where AI form filling goes wrong on Form N-400
Form N-400 asks dozens of yes/no questions about the applicant’s whole life, alongside addresses, trips, children and the people who helped with the form. Intake notes answer some of those questions one by one, sum up others in a single line, and leave some out. These are the common places AI tools and autofill get it wrong. What the form requires is for USCIS to say. Follow its instructions. USCIS instructions for Form N-400.
One line for many questions
An intake can sum up the background questions in a single line, such as “All other security, weapons and immigration-fraud questions: No”. Software can apply it to every question on the page, or to none.
A traffic citation
A citation that ended in a paid fine can look like nothing to report. Software can skip it.
Interpreter and preparer
One sheet names both the interpreter and the attorney who prepared the form. Software can put the same person in both parts.
A child who lives elsewhere
A stepchild who lives with the other parent can be dropped, or given the applicant’s address.
Trips abroad
Trips listed newest first in one table can be merged into one row or filled out of order.
How Fyllyo takes care of them
With a test client and four documents (a client questionnaire, marriage and birth records, a citation with its court disposition, and a fee, interpreter and preparer sheet), Fyllyo filled 163 fields in 48 seconds. It left the Social Security number for the person: the documents show it only masked.
- Yes/no questions the documents never ask. Ticks an answer only where the documents give one. In the test, 37 questions got a No from the questionnaire’s own answers, and the questions it doesn’t cover stayed empty.
- One line for many questions. Uses such a line only for the topics it names. Questions about other topics stay empty for the person.
- A traffic citation. In the test, it ticked Yes on the question about being arrested, cited or charged, and filled the offense from the court record: the 09/14/2024 citation in Aurora, Colorado, the 10/02/2024 outcome and the $95.00 fine.
- Interpreter and preparer. Fills each part with its own person. In the test, the Hindi interpreter and the attorney each went in their own part.
- A child who lives elsewhere. Lists each child with the relationship and residence the questionnaire gives. In the test, the stepchild was listed as not living with the applicant.
- Trips abroad. Fills one row per trip in the order given. In the test, the trip to India and the trip to Canada each got their own row.
How much of a Form N-400 does Fyllyo fill?
Fyllyo fills 396 of the 400 fields on Form N-400 from the client’s documents. Lines the documents don’t support stay blank and are listed for you to check.
You do
- Applicant's preferred USCIS interview field office
- Applicant's date of signature
- Interpreter's date of signature
- and 1 more field that need your judgement
You confirm on every form
- Applicant's A-Number
- Applicant's current legal middle name
- Applicant's current legal first name
- Applicant's current legal last name
- Applicant's date of birth
- and 5 more
What do you give Fyllyo?
Fyllyo reads the documents you already have. These can be PDFs, scans, photos, Word files or typed notes, and you can add several at once. Fyllyo works out which document answers which line.
Filling Form N-400 for clients? Compare AI form fillers for law firms.
Client data stays on your Mac
Client documents and the filled form never leave your computer. Fyllyo uploads nothing. Once it is set up, filling works offline.
What Fyllyo doesn’t do
Fyllyo doesn’t decide what to file, give legal or tax advice, or submit Form N-400 for you. Use the USCIS’s instructions for Form N-400 and your professional judgement. Fyllyo does the reading and the typing.
Which edition of Form N-400 does Fyllyo fill?
The built-in Form N-400 is the edition dated 01/20/25. For a different edition, add that fillable PDF as your own form. You set it up once, then fill it like this one. Set up that fillable PDF as your own form →
What if a document is a scan or a photo?
Fyllyo reads scans and photos as well as PDFs, Word files and typed notes. Clear, readable copies give the best results, and every answer on Form N-400 still shows the line it came from.
Fill your next Form N-400 on your Mac
Try form filling free for 5 days. Then buy Fyllyo Paid once for $99. It is a lifetime licence with free updates and no subscription. Filling forms on your Mac uses no AI credits. Pricing and licence details.