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Machine-readable passport
Machine-readable passport
Machine-readable passport
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A machine-readable passport (MRP) is a machine-readable travel document (MRTD) with the data on the identity page encoded in optical character recognition format. Many countries began to issue machine-readable travel documents in the 1980s. Most travel passports worldwide are MRPs. The International Civil Aviation Organization (ICAO) requires all ICAO member states to issue only MRPs as of April 1, 2010, and all non-MRP passports must expire by November 24, 2015.[1]

Machine-readable passports are standardized by the ICAO Document 9303 (endorsed by the International Organization for Standardization and the International Electrotechnical Commission as ISO/IEC 7501-1) and have a special machine-readable zone (MRZ), which is usually at the bottom of the identity page at the beginning of a passport. The ICAO 9303 describes three types of documents corresponding to the ISO/IEC 7810 sizes:

  • "Type 3" is typical of passport booklets. The MRZ consists of 2 lines × 44 characters.
  • "Type 2" is relatively rare with 2 lines × 36 characters.
  • "Type 1" is of a credit card-size with 3 lines × 30 characters.

The fixed format allows specification of document type, name, document number, nationality, date of birth, sex, and document expiration date. All these fields are required on a passport. There is room for optional, often country-dependent, supplementary information. There are also two sizes of machine-readable visas similarly defined.

Computers with a camera and suitable software can directly read the information on machine-readable passports. This enables faster processing of arriving passengers by immigration officials, and greater accuracy than manually-read passports, as well as faster data entry, more data to be read and better data matching against immigration databases and watchlists.

Apart from optically readable information, many passports contain an RFID chip which enables computers to read a higher amount of information, for example a photo of the bearer. These passports are called biometric passports and are also described by ICAO 9303.

Format

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Passport booklets

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Page of a passport with machine-readable zone in the red oval (US passport pictured)

Passport booklets have an identity page containing the identity data. This page is in the ID-3 size of 125 × 88 mm (4.92 × 3.46 in).

The data of the machine-readable zone consists of two rows of 44 characters each. The only characters used are the Latin letters A–Z, the Arabic numerals 0–9, and the filler character <.

First row
Positions Length Characters Meaning
1 1 alpha P, indicating a passport
2 1 alpha+< Type (for countries that distinguish between different types of passports)
3–5 3 alpha Issuing country or organization (ISO 3166-1 alpha-3 code with modifications)
6–44 39 alpha+< Surname, followed by two filler characters, followed by given names. Given names are separated by single filler characters. Some countries do not differentiate between surname and given name (i.e. no two filler characters), such as the Malaysian Passport

In the name field, spaces, hyphens and other punctuation are represented by <, except apostrophes, which are skipped. If the names are too long, names are abbreviated to their most significant parts. In that case, the last position must contain an alphabetic character to indicate possible truncation, and if there is a given name, the two fillers and at least one character of it must be included.

Second row
Positions Length Characters Meaning
1–9 9 alpha+num+< Passport number
10 1 numeric Check digit over digits 1–9
11–13 3 alpha+< Nationality or Citizenship (ISO 3166-1 alpha-3 code with modifications)
14–19 6 numeric Date of birth (YYMMDD)
20 1 numeric Check digit over digits 14–19
21 1 alpha+< Sex (M, F or < for male, female or unspecified)
22–27 6 numeric Expiration date of passport (YYMMDD)
28 1 numeric Check digit over digits 22–27
29–42 14 alpha+num+< Personal number (may be used by the issuing country as it desires)
43 1 numeric+< Check digit over digits 29–42 (may be < if all characters are <)
44 1 numeric Check digit over digits 1–10, 14–20, and 22–43

Official travel documents

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Hungarian identity card (2016)

Smaller documents such as identity and passport cards are usually in the ID-1 size, which is 85.6 × 54.0 mm (3.37 × 2.13 in), the same size as credit cards. The data of the machine-readable zone in a TD1 size card consists of three rows of 30 characters each. The only characters used are A–Z, 0–9 and the filler character <.

Some official travel documents are in the larger ID-2 size, 105.0 × 74.0 (4.13 × 2.91 in). They have a layout of the MRZ with two rows of 36 characters each, similar to the TD3 format, but with 31 characters for the name, 7 for the personal number and one less check digit. Yet some official travel documents are in the booklet format with a TD3 identity page.

The format of the first row for ID-1 (credit card size) documents is:

Positions Length Chars Meaning
1 1 alpha I, A or C
2 1 alpha+num+< Type, This is at the discretion of the issuing state or authority, but 1–2 should be AC for Crew Member Certificates and V is not allowed as 2nd character. ID or I< are typically used for nationally issued ID cards and IP for passport cards.
3–5 3 alpha+< Issuing country or organization (ISO 3166-1 alpha-3 code with modifications)
6–14 9 alpha+num+< Document number
15 1 num+< Check digit over digits 6–14
16–30 15 alpha+num+< Optional

The format of the second row is:

Positions Length Chars Meaning
1–6 6 num Date of birth (YYMMDD)
7 1 num Check digit over digits 1–6
8 1 alpha+< Sex (M, F or < for male, female or unspecified)
9-14 6 num Expiration date of document (YYMMDD)
15 1 num Check digit over digits 9–14
16–18 3 alpha+< Nationality
19–29 11 alpha+num+< Optional1
30 1 num Check digit over digits 6–30 (upper line), 1–7, 9–15, 19–29 (middle line)[2]

1: United States Passport Cards, as of 2011, use this field for the application number that produced the card. [citation needed]

The format of the third row is:

Positions Length Chars Meaning
1–30 30 alpha+< Surname, followed by two filler characters, followed by given names

The format of the first row for ID-2[3] (medium size) documents is:

Positions Length Chars Meaning
1 1 alpha I, P, A or C
2 1 alpha+< Type, This is at the discretion of the issuing state or authority, but 1–2 should be AC for Crew Member Certificates and V is not allowed as 2nd character. ID or I< are typically used for nationally issued ID cards and IP for passport cards.
3–5 3 alpha+< Issuing country or organization (ISO 3166-1 alpha-3 code with modifications)
6–36 30 alpha+< Name and surname. If there is more than one name they are separated by single filler. Double filler indicates the end of the primary identifier.

The format of the second row is:

Positions Length Chars Meaning
1–9 9 num Document, ID number
10 1 num Check digit over document number
11-13 3 alpha+< Nationality
14-19 6 num Birthday (YYMMDD)
20 1 num Check digit for birthday
21 1 alpha Sex: M, F, or X, for male, female, or unspecified
22-27 6 num Expiration date (YYMMDD)
28 1 num Check digit for expiration
29-35 7 alpha+num+< Optional data
35 1 num Check digit over optional data (not specified in ICAO 9303-6, may be used by issuing country regardless)
36 1 num Check digit over digits 1–10, 14–20, and 22–35

Machine-readable visas

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MRV-B Visa MRZ Construction
Chinese visa (2019)
Russian visa

The ICAO Document 9303 part 7 describes machine-readable visas. They come in two different formats:

  • MRV-A - 80 mm × 120 mm (3.15 in × 4.72 in), 2 × 44 chars
  • MRV-B - 74 mm × 105 mm (2.91 in × 4.13 in), 2 × 36 chars

The format of the first row of the machine-readable zone is:

Positions Length Chars Meaning
1 1 alpha "V"
2 1 alpha+< Type, this is at the discretion of the issuing state or authority
3–5 3 alpha+< Issuing country or organization (ISO 3166-1 alpha-3 code with modifications)
6–44 39 alpha+< Name in MRV-A
6–36 31 alpha+< Name in MRV-B

The format of the second row is:

Positions Length Chars Meaning
1-9 9 alpha+num+< Passport or Visa number
10 1 num Check digit
11–13 3 alpha+< Nationality
14–19 6 num Date of birth (YYMMDD)
20 1 num Check digit
21 1 alpha+< Sex
22-27 6 num Valid until (YYMMDD)
28 1 num Check digit
29–44 16 alpha+num+< Optional data in MRV-A
29–36 8 alpha+num+< Optional data in MRV-B

Specifications common to all formats

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The ICAO document 9303 part 3 describes specifications common to all Machine Readable Travel Documents.

The dimensions of the effective reading zone (ERZ) is standardized at 17.0 mm (0.67 in) in height with a margin of 3 mm at the document edges and 3.2 mm at the edge against the visual readable part. This is in order to allow use of a single machine reader.

Nationality / Citizenship codes

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The nationality codes shall contain the ISO 3166-1 alpha-3 code with modifications for all formats. The check digit calculation method is also the same for all formats.

Some values that are different from ISO 3166-1 alpha-3 are used for the issuing country and nationality field:[4]

Other values, which do not have broad acceptance internationally, include:

Implementation challenges

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Uruguay currently issues passports with the country of birth code in the place of the citizenship code, affecting naturalised citizens as their passports return "error", causing significant travel challenges for passport holders. This is due to a combination of the official Spanish translation of 9303 using "nacionalidad" rather than "ciudadania" to reflect the English original of citizenship - notable in part 3 section 7.1 which specifically addresses this potential error. In October 2023, the high level technical team of TAG/TRIPS4 addressed the Uruguay case and it is proposed the translation is adjusted and the update is communicated to Uruguayan authorities. Uruguayan authorities have committed to reviewing their policy on the understanding citizenship should be used, which overcomes the challenge of domestic definitions of nationality currently differing from citizenship.[citation needed]

Checksum calculation

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The check digit calculation is as follows: each position is assigned a value; for the digits 0 to 9 this is the value of the digits, for the letters A to Z this is 10 to 35, for the filler < this is 0. The value of each position is then multiplied by its weight; the weight of the first position is 7, of the second it is 3, and of the third it is 1, and after that the weights repeat 7, 3, 1, and so on. All values are added together and the remainder of the final value divided by 10 is the check digit.

Names

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Due to technical limits, characters inside the Machine Readable Zone (MRZ) need to be restricted to the 10 Arabic numerals, the 26 capital Latin letters A through Z, and the filler character <.

Apostrophes and similar punctuation marks have to be omitted, but hyphens and spaces should be replaced by an opening angle bracket.

Section 6 of the 9303 part 3 document specifies transliteration of letters outside the A–Z range. It recommends that diacritical marks on Latin letters A-Z are simply omitted (ç → C, ď → D, ê → E, ñ → N etc.), but it allows the following transliterations:

  • å → AA
  • ä → AE
  • ð → DH
  • ij (Dutch letter; capital form: IJ, the J as part of the ligature being capitalized, too)→ IJ
  • ö → OE
  • ü → UE or UXX
  • ñ → NXX (allowed[5] but Spanish uses U and N for ü and ñ)

The following transliterations are mandatory:

In Germany, Austria, Switzerland and Scandinavia it is standard to use the Å→AA, Ä or Æ→AE, Ö or Ø→OE, Ü→UE, and ß→SS mappings, so Müller becomes MUELLER, Gößmann becomes GOESSMANN, and Hämäläinen becomes HAEMAELAEINEN. ð, ñ and ü occur in Iceland and Spain, but they write them as D, N and U.

Austrian passports may (but do not always) contain a trilingual (in German, English, and French) explanation of the German umlauts and ß.

Russian visas and Russian internal passports have a one-to-one correspondence for the Cyrillic letters in the name and the Latin letters in Machine-readable zone, but since Russian alphabet has 33 Cyrillic letters, 26 Latin letters are not sufficient, thus Russia also uses some Arabic numerals for the Cyrillic letters.[6][7] This system is not used for Russian international passports which follow the international standard in which the MRZ is based on the transliteration into Latin letters.[8]

Cyrillic letter Corresponding Latin letter (or Arabic numeral) Cyrillic letter Corresponding Latin letter (or Arabic numeral) Cyrillic letter Corresponding Latin letter (or Arabic numeral)
Аа A Кк K Хх H
Бб B Лл L Цц C
Вв V Мм M Чч 3
Гг G Нн N Шш 4
Дд D Оо O Щщ W
Ее E Пп P Ъъ X
Ёё 2 Рр R Ыы Y
Жж J Сс S Ьь 9
Зз Z Тт T Ээ 6
Ии I Уу U Юю 7
Йй Q Фф F Яя 8

First and given names

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For airline tickets, visas and more, the advice is to only use the first name written in the passport. This is a problem for people who use their second name (as defined by the order in the passport) as their main name in daily speech. It is common, for example in Scandinavia, that the second or even third name is the one defined for daily usage: for example, the actor Hugh Laurie, whose full name is James Hugh Calum Laurie. Swedish travel agents usually book people using the first and daily name if the first one is not their main name, despite advice to use only the first name. If this is too long, the spelling in the MRZ could be used.

For people using a variant of their first name in daily speech, for example the former US president Bill Clinton whose full name is William Jefferson Clinton, the advice is to spell their name as in the passport.

In Scandinavian legislation, a middle name is a name placed between the given name and surname, and is usually a family name. Such names are written as an extra surname in passports. People have been stranded at airports since they entered this extra family name in the "middle name" field in airline booking forms, which in English speaking tradition is a given name.

Chinese, Japanese, Korean and Hungarian names might pose a challenge too, since the family name is normally written first. Tickets should use given name and surname as indicated in passports. Indonesian and Burmese mononyms also create a challenge in passport issuances, since many of them have no surname.

This name issue is also an issue for post-Brexit EU women under the Brexit settled status (they have two family names, a birth and marriage name, but only the birth name was used by the passport MRZ and therefore used in the settlement application, although they have been using the married name in UK population register).[further explanation needed][9]

See also

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References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Machine-readable passport

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from Grokipedia
A machine-readable passport (MRP) is a standardized featuring a dedicated machine-readable zone (MRZ) on the data page, which encodes the holder's biographical details in a format compatible with (OCR) technology for automated border processing. This zone typically consists of two lines of 44 alphanumeric characters each, capturing essential information such as the document type, number, , surname, given names, date of birth, , expiry date, personal number (if any), and check digits for verification. Adopted globally under ICAO specifications, MRPs enhance the efficiency, accuracy, and security of international travel by reducing manual errors and enabling rapid among automated systems at airports and checkpoints. The development of MRPs traces back to , when ICAO's Air Transport Committee initiated efforts to standardize machine-readable travel documents (MRTDs) amid growing volumes and the need for faster processing. Initial standards were formalized in the early through ICAO 9303, which defined the MRP as a TD-3 sized booklet (125 mm × 88 mm when closed) with at least 32 pages, including the MRZ positioned at the bottom of the visa page (VIZ) for optimal scanning. By 2005, ICAO mandated the MRP format as the universal standard, requiring all member states to issue only MRPs starting April 1, 2010, with non-MRP passports phased out by November 24, 2015, to ensure worldwide compatibility. As of 2025, all 193 ICAO member states issue MRPs compliant with these standards, often enhanced with biometric features. Key technical features of the MRP include the use of ICAO-compliant fonts (OCR-B) in the MRZ for high-accuracy machine reading, with character heights between 1.75 mm and 2.25 mm and precise spacing to fit within the 17.0 mm high effective reading zone (ERZ) positioned at the bottom of the data page with the lower edge 2.0 mm ± 0.5 mm from the document's bottom edge. These specifications, detailed in Doc 9303 Parts 3 and 4, also incorporate security elements like UV-reactive inks and to deter , while the MRZ's check digits—calculated via a modulo 10 —validate during scans. Although MRPs laid the foundation for modern , they do not include embedded chips; subsequent ePassports (eMRPs) build on this by adding contactless RFID technology for digital signatures and facial images, as per ICAO's 2006 public key directory framework. Since their widespread adoption, MRPs have significantly streamlined global migration management, with all ICAO member states issuing them and facilitating efficient processing for billions of international travelers annually, though challenges like MRZ damage or non-compliance in some regions persist.

Overview

Definition and Purpose

A (MRP) is an official issued by a to its citizens for travel, conforming to the specifications outlined in ICAO Document 9303. It features a dedicated machine-readable zone (MRZ) on the data page, where personal details such as the holder's name, , date of birth, passport number, and expiration date are encoded in a fixed (OCR) format using two lines of 44 characters each in font. This standardization ensures compatibility with automated scanning systems worldwide. The primary purpose of the MRP is to streamline and processes by enabling machines to rapidly extract and verify traveler information, thereby reducing reliance on manual and minimizing . By providing a uniform , MRPs facilitate faster passenger clearance at and seaports, supporting the efficient flow of global travel while enhancing security through consistent verification protocols. This automation is particularly vital in high-volume international hubs, where it accelerates low-risk processing without compromising oversight. Introduced in the post-World War II era to replace error-prone handwritten passports and address the surge in international , the MRP concept was formalized by the (ICAO), which began standardization efforts in 1968 and published the initial Doc 9303 in 1980. Key benefits include significantly reduced processing times—often cutting clearance from minutes to seconds—improved accuracy in identity verification to prevent fraud, and seamless integration with global security databases like INTERPOL's Stolen and Lost Travel Documents (SLTD) database, which uses MRZ data to check against approximately 138 million reported compromised documents from INTERPOL's 196 member countries (as of 2024). These advantages have made MRPs a foundational element of modern border management, promoting both efficiency and safety in international mobility.

Relation to Biometric Passports

Biometric passports, commonly referred to as ePassports or electronic Machine Readable Travel Documents (eMRTDs), are standardized by the (ICAO) as advanced travel documents that build upon the foundation of machine-readable passports (MRPs). These documents retain the mandatory Machine Readable Zone (MRZ) while incorporating an embedded contactless (RFID) chip that stores the holder's personal biographical data along with biometric identifiers, primarily a digital , and optionally fingerprints or iris scans. As of 2025, more than 150 ICAO member states issue biometric passports. The evolution from MRPs to biometric passports is seamless, as all ePassports must comply with MRP standards by including an identical MRZ format, which acts as a printed for the electronic on the chip. This MRZ not only enables optical verification but also plays a critical role in securing access to the chip through mechanisms like Basic Access Control (BAC), where details from the MRZ are used to derive keys, preventing unauthorized skimming of the stored . A primary distinction lies in data handling and security: MRPs depend exclusively on optical reading of the MRZ for automated processing, whereas ePassports augment this with digital protections, including (PKI) for chip , digital signatures to verify , and safeguards against or alteration of the biometric information. The biometric passport standards were formalized in ICAO Document 9303 (with new parts introduced in 2006), which extended the MRP framework to specify the inclusion of facial biometrics for enhanced global interoperability; ICAO has standardized eMRTDs as an advancement over MRPs, with member states encouraged to adopt them for new passports to enhance security and interoperability, and widespread adoption beginning in 2006 among member states. This integration offers significant advantages, particularly the MRZ's role as a reliable fallback for reading essential data via conventional scanners if the RFID chip malfunctions or is unreadable, thus preserving seamless cross-border functionality without disrupting legacy systems.

History and Development

Origins and Standardization

The concept of machine-readable passports emerged in the late amid the rapid growth of international following , which strained manual processing systems at borders and airports. The (ICAO), founded in 1944 to regulate and standardize practices among its member states, recognized the need for automated travel documents to enhance efficiency and accuracy. In 1968, ICAO's Air Transport Committee established the Panel on Passport Cards to explore the feasibility of machine-readable formats, focusing on reducing reliance on error-prone handwritten or typewritten entries that often led to transcription mistakes during checks. Prior to machine-readable passports (MRPs), travel documents depended heavily on manual data handling, resulting in inconsistencies and delays as air traffic volumes surged—global passenger numbers had grown from under 10 million in to over 100 million by the late . This pre-MRP era highlighted the limitations of non-standardized, visually inspected passports, where variations in handwriting and formatting across countries complicated verification processes. The ICAO panel's work addressed these challenges by prioritizing (OCR) technology, enabling machines to read standardized data fields directly from the document. A pivotal advancement came in 1980 when ICAO published the first edition of Document 9303, titled A Passport with Machine Readable Capability, formalizing the specifications for MRPs across its 190+ member states. This standard introduced a two-line machine-readable zone (MRZ) at the bottom of the passport's data page, designed for simplicity and universal adoption, with data printed in the font—a monospaced optimized for scanning with constant stroke width and fixed character spacing of 2.54 mm. The recommendation aimed to unify global formats, facilitating automated border controls and reducing in international travel. Early implementations followed soon after, with the issuing the first MRP-compliant passports in 1983.

Evolution of Standards

The standards for machine-readable passports (MRPs) have evolved iteratively through revisions to ICAO Document 9303, particularly Part 5, which specifies requirements for TD3-size MRPs. Initial considerations in the and explored various data capture technologies, including magnetic stripes, but these were abandoned due to reliability issues and lack of standardization; instead, an optical machine-readable zone (MRZ) was adopted for its durability and compatibility with systems. The MRZ format was standardized using the , selected over for improved human readability while maintaining machine accuracy, as detailed in Doc 9303 Part 3. In the , Doc 9303 underwent expansion to encompass a broader family of machine-readable travel documents, including the introduction of a three-line MRZ format for machine-readable visas (MRVs) in Part 7, enabling seamless integration into pages for automated processing at borders. This revision, part of a comprehensive update initiated in by the ICAO Technical Advisory Group on Machine Readable Travel Documents (TAG/MRTD), aimed to enhance across document types without altering the core two-line MRP MRZ. The 2000s marked a pivotal shift toward biometric integration, with the sixth edition of Doc 9303 (2006) updating Part 5 to align MRP specifications with emerging ePassport standards, mandating harmony between the optical MRZ and contactless RFID chip data for secure . This included using MRZ elements—such as document number, date of birth, and expiry date—to derive keys for , ensuring the chip's protected data could only be accessed after optical verification, thereby preventing unauthorized skimming. In 2005, ICAO adopted a global mandate requiring all member states to begin issuing only MRPs no later than April 1, 2010, with all non-MRP passports to be phased out by November 24, 2015, to ensure universal compatibility and security. The seventh edition (2015) refined these protocols for broader adoption of electronic MRTDs, while the eighth edition (2021) of Doc 9303, including Part 5, incorporated digital enhancements such as optional logical data structures for travel records, visa records, and additional , improving data and in eMRPs. As of 2023, ICAO supplements to Doc 9303 enhanced support in MRZ name , expanding character mappings for non-Latin scripts (e.g., , ) to better accommodate diverse nationalities while preserving the 39-character limit, reducing errors in automated systems. Concurrently, ICAO's Technical Advisory Group on Traveler Identity Programs (TAG/TRIP) has initiated preparations for quantum-resistant security in MRPs, evaluating post-quantum cryptographic algorithms to protect RFID chips against future threats, with migration strategies outlined in working papers from 2023 onward.

Document Formats

Passport Booklets

Machine-readable passports (MRPs) are issued in the form of TD3-sized booklets, measuring 125 mm × 88 mm (closed). According to ICAO standards, these booklets consist of a cover and a minimum of eight pages, including a dedicated page that incorporates the holder's personal information and photograph. While the minimum page requirement accommodates basic issuance needs, most countries produce standard 32-page booklets to allow space for visas and endorsements, ensuring compatibility with automated border control systems. The materials used in MRP booklets prioritize durability to support typical validity periods of up to 10 years. Traditional constructions employ paper-based pages with protective laminates, while modern variants often feature synthetic data pages made from polycarbonate or polyethylene terephthalate (PET) to enhance resistance to wear, environmental exposure, and tampering. These materials are selected to maintain structural integrity throughout the document's lifespan, with testing protocols ensuring they withstand repeated handling and travel conditions. The layout of the biodata page is standardized for efficient machine processing, with the machine-readable zone (MRZ) positioned at the bottom in a two-line format. Above the MRZ lies the zone (VIZ), which includes the holder's and printed biographical details that mirror the encoded information in the MRZ for manual verification. This dual-zone design facilitates both human and automated reading at border checkpoints. Some issuing authorities offer variations in booklet length to accommodate frequent travelers, such as 48-page or 64-page editions, which provide additional visa pages without altering the core TD3 dimensions or layout. In electronic machine-readable travel documents (eMRTDs), an chip is typically embedded in the booklet cover to store biometric data, supplementing the MRP features. The standardization of MRP booklets emerged in the 1980s to enable compatibility with emerging automated readers, with ICAO's Doc 9303 first published in 1980 following earlier work by the Panel on Passport Card and related groups.

Passport Cards and Other Forms

Passport cards represent a compact alternative to traditional passport booklets, designed specifically for machine-readable processing in regional travel scenarios. These documents conform to the TD2 size specifications outlined in ICAO Doc 9303, adopting the ID-2 card dimensions of 85.6 mm by 53.98 mm as defined in ISO/IEC 7810. Introduced during the 2000s, passport cards facilitate land and sea border crossings within designated areas, such as between the United States, Canada, Mexico, Bermuda, and certain Caribbean nations. For instance, the United States began issuing them in 2008 as a lower-cost option for non-air travel. In Europe, Ireland launched its passport card in 2015, enabling travel to EU member states, EEA countries, Switzerland, and the United Kingdom. The machine-readable zone (MRZ) on cards typically appears on the reverse side and follows TD2 formatting with two lines of 36 characters each, ensuring compatibility with automated reading systems. These cards may be single-sided or double-sided depending on the issuing authority's design, and they often integrate with (eID) systems through embedded chips in biometric variants. Unlike passport booklets, which accommodate visas and stamps across multiple pages, cards offer greater portability for but are restricted in scope, commonly limited to land and sea travel due to issuing country policies, though ICAO standards permit broader use. Validity periods vary by issuer; for example, 10 years for adults and up to 5 years in Ireland. Beyond passport cards, other machine-readable travel documents include official variants such as laissez-passer and travel documents, which incorporate MRZ for international recognition. , issued to UN officials, adhere to ICAO specifications with a TD3-sized format and MRZ, enabling duty-related travel worldwide. Similarly, travel documents under the 1951 UN Convention Relating to the Status of Refugees feature MRZ to support safe passage, often in booklet or card form with single- or double-sided layouts. These documents typically have abbreviated validity, such as five years for the electronic UN laissez-passer (e-UNLP), and prioritize essential in the MRZ while aligning with the same standardization principles as s. By 2025, several countries, including the and , actively issue passport cards, with broader adoption of compatible card-based official documents enhancing regional mobility.

Machine-Readable Visas

Machine-readable visas (MRVs) are standardized travel documents that provide temporary entry permissions and are designed for automated processing at international borders. These visas conform to the specifications outlined in ICAO Document 9303, Part 7, which ensures compatibility and global interchangeability with other machine-readable travel documents. The format for full-size MRVs, known as MRV-A, features a machine-readable zone (MRZ) consisting of two lines, each with 44 characters, matching the TD3 size used in to enable seamless scanning by existing systems. This alignment with passport MRZ basics supports efficient data capture without requiring specialized equipment modifications. MRVs are typically affixed as stickers or printed directly on designated pages within the holder's , occupying a space that allows for additional annotations or stamps while preserving the document's integrity. The specifications include essential data elements such as the visa type (indicating the purpose of travel, like tourist or ), validity dates (from issuance to expiration), and issuer codes (representing the issuing authority's or ). Introduced during the expansion of ICAO standards in the to encompass a broader family of machine-readable documents, MRVs were developed to streamline visa verification amid growing international travel volumes. In practice, MRVs are scanned at points to record entry and exit details, integrating with databases for rapid authenticity checks and compliance verification. While electronic visas (eVisas) have emerged as digital alternatives, linking traveler data through online systems, physical MRVs retain the MRZ to maintain with legacy automated infrastructure worldwide. This dual approach ensures that MRVs continue to support secure, efficient cross-border movements as specified in ICAO Doc 9303, Part 7.

Machine-Readable Zone

Structure and Layout

The Machine Readable Zone (MRZ) of a machine-readable passport is positioned at the bottom of the page, adjacent to the outer long edge and parallel to the document's spine, ensuring consistent placement for automated scanning. This zone occupies a fixed area designed for (OCR), with the visual inspection zone (VIZ) above it duplicating key biographical data in human-readable form to facilitate manual verification alongside machine reading. MRZ formats vary by document type as specified in ICAO standards. For passport booklets (TD3 size), the MRZ consists of two lines, each containing 44 characters. Passport cards and similar formats (TD2 size) use two lines of 36 characters each, while identification cards (TD1 size) employ three lines of 30 characters per line. Machine-readable visas (MRV-A) feature a two-line MRZ with 44 characters per line. The layout adheres to precise dimensional standards to ensure global . Characters have heights between 1.75 mm and 2.25 mm, and the MRZ is positioned such that its content lies within the effective reading zone (ERZ) spanning 20.32 mm to 25.4 mm from the document's bottom edge to allow for scanner tolerances. Characters are monospaced, measuring 1.95 to 2.05 mm in width, printed at a horizontal density of 10 characters per 25.4 mm (0.1 in). The text is left-justified, with unused positions filled by angle brackets (<) or blanks to maintain structural integrity without altering fixed field positions. The MRZ is printed using the OCR-B monospaced font in size 1 with constant stroke width, optimized for machine readability. This font, specified in ICAO Doc 9303, uses machine-readable ink that contrasts sharply with the background, enabling accurate scanning at resolutions yielding 8 to 16 pixels per character horizontally and vertically. These printing requirements ensure the MRZ remains legible under standard document readers, supporting rapid border processing without degradation from wear or environmental factors.

Data Fields

The Machine Readable Zone (MRZ) of a machine-readable passport, as specified in the TD3 format, encodes essential personal and document data across two lines of 44 characters each, using a restricted set of alphanumeric characters and the filler symbol "<". Line 1 identifies the document type, issuing country, and holder's name, with positions 1-2 indicating "P<" for a standard passport; positions 3-5 containing the three-letter issuing country code in accordance with alpha-3; and positions 6-44 recording the holder's name as surname followed by "<<" and given names (or prenoms), with any unused space filled by "<". Line 2 captures core biographical and validity information, starting with the passport number in positions 1-9 (up to nine alphanumeric characters, in position 10); followed by the holder's nationality code in positions 11-13 (using alpha-3); the date of birth in positions 14-19 formatted as YYMMDD ( in 20, where YY represents the last two digits of the year, MM the month, and DD the day); the holder's sex in position 21, encoded as "M" for , "F" for , or "<" if unspecified; the date of expiry in positions 22-27 also in YYMMDD format ( in 28); an optional personal number or other data element in positions 29-42 (up to 14 characters, such as an identity number, which may be left blank or filled with "<" if unused, in 43); and a composite check digit in position 44. All dates in the MRZ adhere to the YYMMDD structure, with years interpreted based on a 100-year window centered around the issuance date to resolve ambiguity (e.g., 00-49 corresponding to 2000-2049). Names are transliterated into the using a standardized scheme to ensure compatibility with systems, limiting characters to uppercase A-Z, 0-9, and "<". The optional personal number field in Line 2 allows flexibility for additional identifiers, such as national ID numbers, but its use is at the discretion of the issuing authority and must not conflict with MRZ formatting constraints.
LinePositionsField DescriptionExample Encoding
11-2Document typeP<
13-5Issuing country (ISO 3166-1 alpha-3)GBR
16-44Name (surname<<given names)DOE<<JOHN<A<<<<<<<<<<<<<<<<<<<<<<<<
21-9Passport number123456789
210Check digit (number)0
211-13Nationality (ISO 3166-1 alpha-3)GBR
214-19Date of birth (YYMMDD)750612
220Check digit (DOB)1
221SexM or F or <
222-27Date of expiry (YYMMDD)250101
228Check digit (expiry)2
229-42Optional personal number12345678901234 or <<<...
243Check digit (personal)0
244Composite check digit0
This tabular representation illustrates the primary data fields for TD3; all fields use the OCR-B font for machine readability. Check digits are derived separately.

Checksum Calculation

The checksum calculation in the machine-readable zone (MRZ) of machine-readable passports uses a weighted modulo 10 algorithm to verify the integrity of key data fields, ensuring accurate interpretation by optical character recognition systems. This method applies specifically to numeric and alphanumeric fields, including the passport number, birth date, expiry date, and personal number, with check digits appended to each relevant field. The algorithm employs cycling weights of 7, 3, and 1, assigned sequentially from left to right across the characters in the field. To compute the check digit, each character in the field is first converted to a numerical value: digits 0–9 retain their value, uppercase letters A–Z are mapped to 10–35 (A=10, B=11, ..., Z=35), and filler characters (<) are treated as 0. For alphanumeric fields like the passport number, these mappings allow inclusion of letters in the calculation. The weighted sum is then formed by multiplying each character's value by the corresponding weight, summing the products, and taking the result 10. The is this remainder, or 0 if the sum is exactly divisible by 10. The formula for a field with characters d1,d2,…,dnd_1, d_2, \dots, d_n (where value(di)value(d_i) is the numerical equivalent) and weights wiw_i cycling through 7, 3, 1 is: Check digit=(∑i=1nvalue(di)×wi)mod  10\text{Check digit} = \left( \sum_{i=1}^{n} value(d_i) \times w_i \right) \mod 10 This process detects single-digit errors and most transpositions, providing robust error-checking for automated reading while minimizing false positives in data entry or scanning. The same algorithm is applied consistently to the fields and composite check digit for line 2. For instance, consider the birth date field "750612" (YYMMDD format). The values are 7, 5, 0, 6, 1, 2, with weights 7, 3, 1, 7, 3, 1. The products are 49, 15, 0, 42, 3, 2, summing to 111. Then, 111mod  10=1111 \mod 10 = 1, so the check digit is 1.

Data Specifications

Nationality and Citizenship Codes

The and codes in machine-readable passports (MRPs) utilize three-letter codes derived from the alpha-3 standard to denote the holder's or . These codes occupy positions 11 through 13 in the second line of the MRZ, as specified by ICAO standards, ensuring automated readability by systems. The use of these codes is mandatory for all MRPs to facilitate global interoperability in processing. For cases without standard nationality affiliations, special codes are employed: XXA designates a stateless person under the 1954 Convention Relating to the Status of Stateless Persons; XXB indicates a as defined in Article 1 of the 1951 Convention Relating to the Status of Refugees; XXC applies to refugees not covered under XXB; and XXD denotes a person of unspecified where the issuing state deems further specification unnecessary. These special codes ensure that vulnerable individuals can obtain machine-readable travel documents compliant with international norms. The codes are updated through revisions to the standard, with the latest edition published in 2020 and last reviewed in 2025, incorporating changes such as the addition of SSD for following its independence in 2011—a post-2010 update reflecting new geopolitical realities. ICAO maintains a compatibility list of these three-letter codes in its Doc 9303, Part 3, to align with ISO updates and ensure consistent application across MRPs. Changes to these codes, such as the dissolution of the USSR in —which replaced the former SU code with individual codes for successor states like RUS (), (), and ()—often necessitate the reissuance of affected passports to maintain validity and compliance with updated standards. The following table provides examples of 15 common alpha-3 codes used in MRPs, along with their corresponding or names:
CodeCountry/Territory Name
USAUnited States of America
GBR
CAN
FRA
DEU
ITA
JPN
CHN
IND
BRA
MEX
AUS
ESP
NLD
SSD

Personal Name Representation

In the machine-readable zone (MRZ) of a passport, personal names are encoded on the first line following the document type indicator (P) and the three-letter issuing country code. The name field occupies positions 6 to 44 (39 characters total). The primary identifier(s) (surname(s)) are entered first, separated by < if compound, followed by << to separate from the secondary identifier(s) (given name(s)), which are also separated by < if compound. Fillers < are used for unused positions. If the total length exceeds 39 characters, the secondary identifiers are truncated. This structure ensures standardized machine readability while accommodating variations in name length and composition. Transliteration is required for names in non-Latin scripts to convert them into the basic Latin alphabet (A-Z) used in the MRZ, as specified in ICAO Doc 9303. For languages using Cyrillic, Arabic, Chinese (via Pinyin), or other scripts, standardized romanization tables guide the conversion; for example, the Cyrillic letter "Ч" transliterates to "CH," and "Ш" to "SH." Diacritical marks are omitted or substituted—such as Ä becoming AE, Ö as OE, and Ü as UE—to maintain compatibility with optical character recognition systems. These rules prioritize phonetic approximation while ensuring the transliterated name closely matches the visual zone representation where possible. Specific encoding rules apply to handle punctuation and spacing within names. A single filler character (<) represents spaces, hyphens, commas, or apostrophes; for instance, "O'Connor" becomes "OCONNOR" or "O<CONNOR" if the apostrophe position requires separation, and "Jean-Paul" is rendered as "JEAN<PAUL." If the combined surname and given names exceed 39 characters after applying these substitutions, truncation occurs from the end of the given names, with the final character potentially replaced by a filler if needed. For individuals with mononyms (a single name without distinction between surname and given names), the full name is entered in the surname field, followed by << and fillers to fill the remaining positions. These conventions present challenges, particularly with cultural naming practices that do not align neatly with the surname-first format. For Chinese names, which traditionally place the family name first without spaces, is applied directly—e.g., "Li Wei" becomes "LI<<WEI"—but inconsistencies can arise if issuing authorities vary in interpreting compound family names. Similarly, gender-neutral or composite names from diverse traditions may require careful application of fillers to avoid ambiguity, underscoring the need for consistent national implementation of ICAO guidelines. The 8th edition of Doc 9303 (2024) refines these tables to better support multi-script origins, improving global .

Date Formats and Other Elements

In the Machine Readable Zone (MRZ) of passports, dates are formatted using a six-digit string in YYMMDD order, where YY represents the last two digits of the year, MM the month (01-12), and DD the day (01-31, subject to calendar validity). This compact representation facilitates automated while conserving space in the fixed 44-character second line of the MRZ. The holder's date of birth occupies positions 15 to 20 in this line, followed by a in position 21. For example, the date June 12, 1975, is encoded as 750612. The passport's expiry date is similarly formatted and placed in positions 23 to 28, with a in position 29. Century interpretation for YY is determined by reading systems based on context (e.g., reasonable birth ages, future expiry dates) to resolve ambiguities. The sex of the document holder is indicated in position 22 of the second MRZ line using a single character: , , or < for unspecified. Some issuing states use X for non-binary in the visual zone, but the MRZ sex field remains M, F, or <. As of 2025, U.S. Customs and Border Protection requires binary M or F in advance passenger information systems for international travel. This field ensures compatibility with gender-based processing in systems without requiring additional interpretation. An optional personal number field, such as a number or other identifier, may be included in positions 30 to 42 of the second line, allowing up to 13 alphanumeric characters. If used, this field includes its own in position 43; otherwise, it is filled with < characters, and position 43 also uses <. This optional element enhances for countries that incorporate supplementary identification data, provided it adheres to the overall MRZ in position 44. Unused positions in the MRZ are filled with the < character to maintain structural integrity and prevent misreads during scanning; blank spaces are not permitted, as they could disrupt OCR accuracy. Validity rules stipulate that the expiry date must follow the passport's issue date (recorded in the visual inspection zone), with maximum validity periods varying by issuing country—typically 5 to 10 years for adults, and shorter for minors—while the birth date must precede the issue date by a reasonable age span consistent with national regulations.

Security and Verification

Basic Security Features

Machine-readable passports (MRPs) incorporate several basic security features in their physical construction to deter counterfeiting and tampering, distinct from the machine-readable zone (MRZ) which serves as a foundational layer for optical extraction. These overt features are designed for visual and simple instrumental verification, ensuring authenticity during manual inspections. Printing techniques on the biodata page include intricate guilloche patterns—fine-line geometric designs that are difficult to replicate without specialized equipment—alongside microtext lines that appear as solid elements to the but reveal tiny text under magnification. (UV) inks are commonly applied, remaining invisible under normal light but fluorescing in specific colors or patterns when exposed to UV radiation; the MRZ itself is printed in non-fluorescent to maintain consistent for optical scanners. Holograms and laminates enhance protection through optically variable devices (OVDs), such as diffractive holograms placed over the holder's , which shift in color and image based on viewing angle to prevent photo substitution. Tamper-evident covers the page, incorporating adhesives that delaminate or discolor upon attempted removal, revealing alterations. The security substrate typically consists of embedded with watermarks—semi-transparent images or patterns visible when held to —to verify paper authenticity and resist reproduction. Verification of these features involves basic tools: UV illuminates hidden fluorescent elements, microtext, and patterns for , while tilting the reveals OVD effects and checks laminate for anti-forgery purposes during optical scanning. Additionally, the MRZ includes check digits calculated using a modulo 10 algorithm to validate during automated verification. ICAO Document 9303, particularly Parts 1 and 2, mandates the inclusion of specified basic security features for all conforming MRTDs, including at least watermarks, , and UV elements as outlined in Appendix A, Table A-1, to ensure a minimum level of overt .

Implementation Challenges

One significant technical challenge in implementing machine-readable passports (MRPs) is ensuring scanner compatibility with the font mandated by ICAO standards for the machine-readable zone (MRZ). Older or non-compliant scanners often struggle to accurately recognize this , leading to misreads of critical data fields such as passport numbers and expiry dates. Additionally, handling damaged MRZs poses difficulties; smudges, creases, or fading ink from can degrade readability. Data-related challenges further complicate MRP deployment, particularly transliteration inconsistencies across languages. Non-Latin scripts, such as Arabic or Cyrillic, require romanization per ICAO guidelines, but variations in national practices lead to mismatches between the visual zone and MRZ, complicating automated verification. Legacy border control systems in many countries also fail to support updated nationality and citizenship codes introduced in recent ICAO amendments, necessitating costly software upgrades to avoid rejection of valid documents. In developing countries, cost and infrastructure barriers exacerbate adoption issues. High expenses for secure printing facilities and MRZ-compliant readers strain limited budgets, delaying full MRP rollout despite ICAO's 2015 deadline for phasing out non-machine-readable passports. border agents to interpret MRZ and troubleshoot errors adds further demands. Specific operational problems include name length limits in the MRZ, which cap fields at 31 characters, causing truncation of long surnames common in cultures like those in or , potentially leading to identity mismatches. errors from manual , often due to human transcription mistakes, can undermine the MRZ's error-detection mechanism at busy checkpoints. To address these hurdles, ICAO has developed training programs, including workshops and online modules, delivered to member states since 2010 to enhance MRZ handling skills. Software solutions for error correction have also emerged, with AI-based optical character recognition (OCR) systems improving damaged MRZ readability through convolutional neural networks trained on diverse passport datasets. The digital transition to ePassports, incorporating biometric chips alongside MRZs, introduces additional challenges, such as integrating legacy MRP systems with RFID readers while maintaining backward compatibility. Post-COVID-19 adoption delays, driven by global supply chain disruptions and issuance backlogs, have affected MRP upgrades in various countries, with recovery efforts ongoing as of 2025.

Global Adoption

International Standards Compliance

The (ICAO), comprising 193 Member States, established a global mandate in 2005 requiring all members to begin issuing machine-readable passports (MRPs) compliant with ICAO Doc 9303 standards, with full implementation enforced for all new passports issued after April 1, 2010. This directive aimed to standardize travel documents for enhanced security and efficient border processing worldwide. By the 2010 deadline, 170 of 190 Member States were issuing MRPs, and remaining non-compliant passports were required to expire by November 24, 2015, achieving near-universal adoption. Since the November 24, 2015, deadline for phasing out non-compliant passports, MRP standards have achieved near-universal adoption globally, reflecting complete compliance across nearly all issuing authorities. Adoption timelines varied by region, with advanced economies leading the transition. The , through Regulation (EC) No 2252/2004, mandated MRP-compliant biometric passports across member states by August 28, 2006, ensuring early and uniform adherence ahead of the global deadline. In developing nations, progress was supported by ICAO's Facilitation Programme, which has provided technical assistance, training, and capacity-building to over 80 states since the early 2000s to implement MRTD systems, often in partnership with United Nations agencies like the . These efforts addressed resource constraints, enabling widespread issuance in regions such as and by the mid-2010s. Compliance is monitored through ICAO's oversight mechanisms and the (IATA)'s database, which airlines consult to verify document validity before boarding. Non-compliant passports are routinely rejected at international borders, preventing travel disruptions and enforcing standards. As of 2025, 178 ICAO Member States issue ePassports—a biometric subset of MRPs—with over 1 billion such documents in global circulation. This adherence facilitates seamless cross-border movement in key regional frameworks, including automated e-gates in the for faster processing and the program for streamlined business travel among 21 economies. MRP standards also underpin electronic authorization systems like the U.S. (ESTA), which requires compliant documents for visa-waiver travel.

Variations and Exceptions

While the (ICAO) standards in Doc 9303 aim for uniformity in machine-readable travel documents (MRTDs), certain national variations arise from historical, political, or administrative needs. For instance, some countries have historically employed four-letter codes in early MRZ implementations before the adoption of the three-letter alpha-3 standard for issuing states, though such practices are now obsolete and non-compliant with current specifications. Exceptions occur in temporary or travel documents, which may lack a full MRZ to expedite issuance in urgent situations, such as lost passports during ; these are addressed in ICAO Doc 9303 Part 8, allowing for simplified formats without compromising basic readability where possible. Non-ICAO member states like utilize the designated code "TWN" in the field of their MRZ, enabling international recognition despite geopolitical constraints. Special cases include diplomatic passports, which incorporate unique MRZ fields such as a "D" indicator for document type (e.g., "PD" instead of "P<") to denote official status, while adhering to core ICAO formatting for interoperability. Refugee and stateless persons' travel documents employ special nationality codes in the MRZ: "XXA" for stateless individuals under the 1954 Convention, "XXB" for refugees as defined in the 1951 Convention, and "XXC" for other refugees, facilitating their movement without a standard national code. These variations can lead to challenges, including when automated readers encounter non-standard formats, prompting manual verification and increasing wait times at checkpoints. ICAO addresses such issues through ongoing harmonization efforts, including updates to Doc 9303 that promote global compliance and reduce discrepancies in MRTD specifications. In recent developments as of 2025, post-Brexit passports continue to use the "GBR" code for nationality and issuing state, maintaining seamless integration with and global systems. Similarly, State passports, coded "VAT," achieve ICAO compliance with support from Italy's infrastructure, allowing Vatican citizens to travel under recognized standards despite the enclave's unique status.

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