Passport Bio Data Page: Contents, Chip, and Corrections

The passport bio-data page is the personal-information page inside your passport booklet — the one carrying your photo, name, date of birth, passport number, and expiration date on a single spread. It’s the page border agents check, the page airlines scan, and the page consulates photocopy when you apply for a visa. The International Civil Aviation Organization (ICAO) sets a worldwide standard for what this page contains and how machines read it, so passports from different countries follow essentially the same template.

What’s Printed on the Page

ICAO Doc 9303 divides the page into labeled zones. The header identifies the issuing country in full and as a three-letter code, prints the word “Passport” in the issuing country’s language plus an ICAO-recognized language, and shows a document code beginning with “P” to designate a machine-readable passport.¹ That’s why you’ll see “Type: P” near the top.

The personal data zone carries your full name split into a primary identifier (surname) and secondary identifiers (given names), your nationality, date of birth, and sex. The sex field uses “F,” “M,” or “X,” though each country decides which options it issues. The document data zone lists the passport number, date of issue, expiration date, and issuing authority.¹ Your photograph and signature or usual mark round out the mandatory elements. Some countries also print a personal identification number or place of birth, but those aren’t universally required.

The Machine-Readable Zone

At the bottom of the page sits the Machine-Readable Zone, or MRZ: the block of capital letters, numbers, and angle-bracket filler characters a scanner reads at the border. For a standard passport, the MRZ is exactly two lines of 44 characters each.¹

The first line encodes the document code, issuing country, and name. The second line packs in the passport number, nationality, date of birth, sex, expiration date, and an optional personal number, along with single-character check digits that let the scanner confirm it read each field correctly.¹ The MRZ also serves as the key that unlocks the passport’s electronic chip.

The Electronic Chip

Most passports issued today are e-passports, marked by a small rectangular symbol on the front cover. An embedded contactless chip stores a digital copy of the data printed on the bio-data page, a digital version of your photo, and a digital signature that lets a reader verify nothing has been altered. Some countries store additional biometrics like fingerprints.

The chip uses radio-frequency technology, but it isn’t broadcasting your information to anyone nearby. The cover contains a metallic shield that blocks the signal when the booklet is closed. Even open, a security mechanism called Basic Access Control requires the reader to first scan the MRZ and derive a session encryption key from the passport number, date of birth, and expiration date before the chip responds. In practice, someone needs physical access to your open passport to read it.

Security Features

The bio-data page is the most heavily protected page in the booklet. ICAO Doc 9303 lays out a layered approach: some features are visible to the eye, others reveal themselves under UV light or magnification, and a final tier is known only to forensic labs and the manufacturer.²

Visible protections include fine-line guilloché patterns in the background, rainbow color shifts that resist ordinary printers, and watermarks in the paper that appear when you hold the page to light. ICAO recommends the bio-data page use a different watermark from the visa pages to prevent page swapping between booklets. Under UV light, fluorescent inks glow in predetermined colors and patterns as a required feature, not an optional upgrade. Microprinted text runs through the design, and chemical sensitizers in the paper react visibly to erasure or alteration attempts.²

Many countries now use polycarbonate for the bio-data page rather than paper. On a polycarbonate page, personal details and the photograph are laser-engraved into the material itself, which makes scratching off or chemically altering the data extremely difficult.

Check the Expiration Date Before You Travel

The expiration date on your bio-data page matters more than travelers often realize. Many countries require a passport to be valid at least six months beyond an intended stay, not just valid on the day of arrival. The United States enforces this rule for most inbound visitors, though citizens of certain countries are exempt and need only a passport valid through the length of their trip.³

The rule works in reverse for U.S. citizens traveling abroad: your destination country may refuse entry if your passport expires within six months of your arrival, and airlines sometimes catch it at the gate before you board. Check the expiration well before booking, because renewal takes time even under routine processing.

If Your Bio-Data Page Is Damaged

A passport counts as damaged when its physical appearance or composition has changed through ordinary wear, carelessness, or accident — a booklet run through the washing machine, torn, singed, or chewed by a pet all qualify.⁴ A more serious category is a mutilated passport, one the holder altered intentionally.

If your bio-data page is water-stained, cracked, peeling, or hard to read, don’t risk traveling with it. Border agents and airline staff can refuse a passport they consider too damaged to verify. The MRZ is especially critical: if the scanner can’t read those two lines, you’re likely to face delays or denial of boarding. For a U.S. passport damaged beyond normal wear, you’ll need to apply in person with Form DS-11 as if applying for the first time, along with proof of citizenship, a photo, and the applicable fees.

Keep a Copy Before You Travel

Before any international trip, photograph or scan the bio-data page and store the image somewhere you can access without your physical passport, such as a secure cloud folder, an email to yourself, or a trusted travel companion’s phone. If your passport is lost or stolen abroad, that copy speeds up the process at a U.S. embassy or consulate. Many hotels and tour operators also ask for a photocopy at check-in, and handing over a copy is safer than leaving the booklet at a front desk.

Changing Information on the Page

Because the bio-data page is either laser-engraved into polycarbonate or printed under layers of security features, you can’t simply update a field. Any change requires a new passport. The process depends on what changed and when.

Name Changes

If your name changed through marriage, divorce, or court order, and both the name change and your current passport are less than one year old, submit Form DS-5504 by mail with your current passport, an original or certified name-change document, and one passport photo. There’s no fee unless you want expedited processing, which costs $60.⁵

If more than a year has passed since either your passport was issued or your name was legally changed, DS-5504 no longer applies. You’ll renew by mail with Form DS-82 (if your passport was issued when you were 16 or older, within the last 15 years, and is undamaged) or apply in person with Form DS-11. Both paths require your name-change document, a passport photo, and the standard fees.⁵ The current fee for an adult passport book renewal is $130.⁶

Correcting a Printing Error

If the State Department made a mistake printing your passport — a misspelled name, wrong birth date, or similar data error — submit Form DS-5504 with documentation showing the correct information. There’s no fee for correcting a government error.⁷

Sex Marker

Under current U.S. policy, the State Department recognizes two sex designations, male and female, and requires that passports reflect the holder’s sex assigned at birth. The “X” gender marker, briefly available, is no longer issued on new passports, renewals, or replacements. Existing passports that already carry an “X” or a gender-identity-based marker remain valid until they expire.

Renewing Online

If your passport is expiring and no personal information needs to change, online renewal is now an option. You’re eligible if your current passport was valid for 10 years, is expiring within one year or expired less than five years ago, and you’re 25 or older. You must be located in a U.S. state or territory when you submit, and you can’t be traveling internationally for at least six weeks. The fee for an adult passport book is $130, the same as a mail renewal.⁸

One detail to note: the State Department cancels your old passport as soon as you submit the online application. Don’t start the process if you have upcoming travel before the new one arrives. You’ll need a digital passport photo, a credit or debit card, and your Social Security number to complete it.

1
International Civil Aviation Organization. ICAO Doc 9303 Part 4 – Specifications for Machine Readable Passports
2
International Civil Aviation Organization. ICAO Doc 9303 Part 2 – Specifications for the Security of the Design, Manufacture and Issuance of MRTDs
3
U.S. Customs and Border Protection. Six-Month Validity Update
4
U.S. Embassy in Honduras. Damaged and Mutilated Passport
5
U.S. Department of State. Name Change for U.S. Passport or Correct a Printing or Data Error
6
U.S. Department of State. United States Passport Fees
7
U.S. Department of State. Passport Fees
8
U.S. Department of State. Renew Your Passport Online