Verifying a French biometric ID card: complete guide in 4 checks (MRZ, security, validity)

Article updated in February 2026 to reflect the latest developments in French biometric ID cards and online document verification tools.

The French biometric identity card, introduced in 2021, is gradually replacing the former 1995 French ID card. It is now a key official document used to prove identity and French nationality in many contexts, including KYC, banking, insurance, real estate, public administrations, digital platforms, and online services.

Like any modern identity document, it is still exposed to document fraud risks such as expired cards, visual alterations, inconsistencies between data fields, MRZ falsification, reuse of stolen documents, or identity theft.

In 2026, it is now possible to perform an initial online verification using documentary analysis and automatic MRZ reading, before completing this process with an in-depth visual inspection of the document’s physical security features.

How can you verify a French biometric ID card and ensure the document presented is authentic?
This guide provides the answer through four essential verification checks.

Before any visual inspection, an initial automatic verification can be performed using a simple image of the document.

This step enables:

• automatic MRZ reading
• validation of check digits
• consistency checks across key fields (name, date of birth, expiration date, nationality, document number)
• detection of data entry errors or common inconsistencies
• generation of a timestamped PDF report

⚠️ There is no public database allowing official validation of a French biometric ID card. Online verification therefore relies solely on documentary analysis and must be complemented by a visual inspection of security features.

When access to the original card is possible, the first step is to examine the overall appearance of the document. The card should show no signs of cutting, delamination, gluing, or visible alteration. Particular attention should be paid to the photo area and transparent edges.

The French biometric ID card follows the ID-1 format (bank card size), with a polycarbonate body designed to make any tampering visible.

The second step consists of verifying the consistency of the information displayed on the card and its alignment across the different areas of the document.

Key elements to verify include:

• document number (present on the front and in the MRZ)
• date of birth
• surname and given name(s)
• holder’s gender
• nationality
• expiration date (displayed in several locations)

Any discrepancy between these elements should be treated as a warning signal requiring further investigation.

The document number can be found in two different places: on the lower part of the front side, and in the first line of the MRZ.

Both must be identical:

The date of birth of the holder can also be found in two different places: in the middle of the front of the card and at the beginning of the second MRZ line in the format YYMMDD:

The same goes for last and first names, which can be found on the front of the card and in the third line of the MRZ:

The holder’s gender is indicated by “M” for male and “F” for female. This information is found on the front side and in the second MRZ line:

The holder’s nationality can be found in ISO 3166-1 format on the front of the card and in the second MRZ line:

Finally, the last element present three times on the card: the expiry date, which can be found on the front, on the back printed over the miniature photo, and in the second MRZ line in the format YYMMDD:

The lower part of the French biometric ID card contains a three-line MRZ encoding the document’s data in a standardized format along with check digits.

The MRZ allows:

• verification of document structure
• mathematical validation of encoded data
• detection of transcription errors or falsification attempts

Check digits rely on the ICAO standard algorithm using fixed weights (7, 3, 1), ensuring reliable and automatable verification.

1. Document Type: 2 characters, code indicating the type of document, represented by the letters “ID”.
2. Issuing Country: 3 characters, the ISO 3166-1 alpha-3 code of the issuing country.
3. Card Number: 9 characters, unique card number.
4. Check Digit: 1 character, check digit for the unique card number.
5. End of Line: filler chevrons “<” to complete the line.

1. Date of Birth: 6 characters, year, month, and day of birth in the format YYMMDD.
2. Check Digit: 1 character, check digit of the date of birth.
3. Gender: 1 character, “M” or “F”.
4. Expiry Date: 6 digits, card expiry date in the format YYMMDD.
5. Check Digit: 1 character, check digit of the expiry date.
6. Country Code: 3 characters, ISO 3166-1 alpha-3 code of the holder’s nationality.
7. Separator: 11 characters, “<“.
8. Check Digit: 1 character, check digit of the concatenation of characters line 1 positions 6-15, line 2 positions 1-7, line 2 positions 9-15.

1. Holder’s Last and First Names: holder’s last and first names, starting with the family name followed by the first name. The last name and first name are separated by two “<” characters. In case of compound last names, compound first names, or multiple first names, they are separated by the “<” character. Spaces and apostrophes are replaced by the “<” character and the name is truncated to 30 characters if needed, and any accents on letters are removed. The line is then completed with the “<” character.

A French biometric identity card includes 4 check digits (or security keys) that validate the information preceding them.

They help avoid transcription errors or intentional/unintentional modifications.

The algorithm used to create and validate the check digits is common to all identity documents: characters have a weight, which is multiplied by a factor depending on their position in the string (7, 3, and 1).

Digits have their value (“0” = 0, “1” = 1, …, “9” = 9), the chevron “<” also has a value of 0, while letters start at 10 for “A”, 11 for “B” up to 35 for “Z”.

Let’s take as an example the check digit of the date of birth from the specimen above.

The string to validate is: “900713”.

To calculate the check digit, we proceed as follows:

– “9” has a value of 9 and is in the first position, so multiply by 7: 9 * 7 = 63

– “0” has a value of 0 and is in the second position, so multiply by 3: 0 * 3 = 0, add to previous 63: 0 + 63 = 63.

– “0” has a value of 0 and is in the third position, so multiply by 1: 0 * 1 = 0, add to previous 63: 0 + 63 = 63.

– 7 * 7 = 49 and 49 + 63 = 112

– 1 * 3 = 3 and 3 + 112 = 115

– 3 * 1 = 3 and 3 + 115 = 118

We obtain a total of 118, from which we take modulo 10 (the remainder of the division by 10), which keeps only the last digit, “8”.

Our check digit is therefore valid because 8 appears on the document!

The French biometric ID card includes several advanced security features, some visible to the naked eye and others requiring specialized equipment.

Key security features include:

• secure background extending into the transparent edge
• holographic device protecting the photo
• visible electronic seal / 2D-Doc barcode
• contactless electronic chip
• Multiple Laser Image (MLI)
• ultraviolet-visible elements

These features make document reproduction or alteration extremely difficult and are essential for confirming the physical authenticity of the card.

The first quickly and visually checkable security element: the security background extends into the transparent edge of the card, making the whole consistent:

A next-generation holographic device is used to protect the cardholder’s photograph.

It changes color depending on the orientation:

A new security feature used on other official documents (such as income tax notices), a Visible Electronic Seal (VES) or 2D-Doc code is used to encode the information present on the card, allowing online verification by cross-checking with the card’s visible data.

It appears on the back, top right corner:

An electronic chip is embedded in the card allowing contactless reading of the information stored on the document.

A Marianne emblem and three “RF” letters are engraved on it.

Again, it is possible to verify a French biometric identity card online by cross-checking information on the card or from the VES / 2D-Doc barcode.

You can find it just below the VES / 2D-Doc code:

The photo and expiry date of the document are reproduced on a map of metropolitan France.

The image changes depending on the card’s orientation.

This feature is located on the back, top right of the card:

Some elements are visible only under ultraviolet light, but this requires specialized equipment (thus not suitable for verifying a French biometric identity card online).

Front of the card under ultraviolet light:

Back of the card under ultraviolet light:

You now have all the necessary tools to verify a French biometric ID card and assess its authenticity in a structured and reliable way.

Without specialized equipment, combining MRZ analysis, data consistency checks, and visual inspection already allows detection of many common document fraud scenarios.

To go further, online document verification solutions can also be used. For example, TrustDocHub enables automatic verification of French biometric ID cards from a simple image, delivering results directly within the application and as a timestamped PDF report.