What Is Fingerprinting?

Fingerprinting is a biometric method used to identify individuals based on the unique patterns on their fingertips. Widely used across law enforcement, background screening, and biometric security, it allows authorized agencies to compare a person's identity against official records.

But the term “fingerprinting” is no longer limited to physical fingerprints. It can also describe processes that identify people, devices, files, or substances by analyzing distinctive patterns or characteristics.

Fingerprinting can involve several steps, from capturing the fingerprints to preparing and submitting them to the relevant authority. Learn more about how fingerprinting works and what documents you may need for fingerprinting in our detailed guides.

The fingerprinting process can take different forms depending on what is being identified and how the information will be used. These include physical and forensic fingerprinting, digital and device fingerprinting, and scientific and biological fingerprinting.

Because physical fingerprinting remains the most established and regulated form, especially for identity verification and background checks, the rest of this guide focuses on how it works in practice.

Physical fingerprinting is widely used for identification because fingerprint ridge patterns are highly distinctive and remain stable throughout a person's lifetime.

• Uniqueness: Even identical twins have different fingerprints, making them useful for distinguishing one person from another.
• Persistence: Minor cuts or surface injuries may affect the skin temporarily, but the underlying ridge pattern remains unchanged.
• Comparability: Fingerprints can be captured, digitized, and compared with known fingerprint records. Automated fingerprint identification systems can analyze distinctive features in a print to determine whether it corresponds with an existing record.

Although every person's fingerprints are distinctive, most fingerprint patterns can be broadly classified into three basic types:

• Loops: The ridges enter from one side, curve around, and exit from the same side.
• Whorls: The ridges form circular, spiral, or concentric patterns around a central area.
• Arches: The ridges enter from one side and rise in the center before leaving through the other side.

These broad classifications help describe fingerprint patterns, but identification does not depend on the overall pattern type alone. More detailed ridge characteristics are used when fingerprints are examined or compared.

In law enforcement and administrative screening, physical fingerprints are used in:

1. Forensic Police Investigations

Forensic specialists may encounter three types of fingerprint impressions:

• Latent prints: Usually invisible impressions left by natural oils and perspiration.
• Patent prints: Visible impressions transferred through substances such as blood, ink, dirt, or paint.
• Plastic prints: Three-dimensional impressions left in soft materials such as wax, putty, or fresh paint.

Analysts can then use methods such as ACE-V (Analysis, Comparison, Evaluation, and Verification) to compare recovered prints with known fingerprints.

2. Employment and Background Check Screening

Unlike forensic investigations which analyze partial or smudged prints from a crime scene, background checks require a full, intentionally captured set of prints from an applicant.

• The Collection: Applicant prints are captured using either traditional ink rolled onto paper cards or via modern digital scanners known as Live Scan.
• The Submission: Depending on the background check, fingerprints are submitted electronically or sent on the required fingerprint card to the relevant government agency or authorized processing channel.
• The Match: The receiving agency compares the fingerprints against its records to identify a possible match and produce the required background-check result.

Fingerprints are collected primarily using ink and digital methods.

When people think of fingerprinting, they often picture a person pressing inked fingers onto a fingerprint card. That is broadly correct, but there is an important distinction between flat impressions and rolled impressions.

Flat vs. Rolled Fingerprints

A flat or plain impression is made by pressing the finger straight down onto the fingerprint card. It captures the ridge patterns from the portion of the finger that touches the card but does not record the entire side-to-side surface of the fingertip.

A rolled fingerprint, by contrast, is captured by placing the inked finger on one edge of the nail and carefully rolling it across the fingerprinting area to the opposite edge. This records a larger portion of the fingertip and provides more ridge detail for examination and comparison.

Rolled impressions are commonly required on official fingerprint cards used for international background checks. Cards such as the FBI FD-258 and RCMP C-216C include designated spaces for rolled impressions as well as plain impressions.

Why Are Rolled Impressions Used?

Rolling the finger allows the fingerprint specialist to capture ridge detail across the full width of the fingertip. This can provide a more complete impression for the authority conducting the fingerprint comparison.

A properly captured rolled print should show clear ridge patterns without excessive pressure, gaps, smudging, or overlapping areas. The provider must control the direction and movement of the finger while keeping the fingertip in contact with the card throughout the roll.

Fingerprint cards may also include plain impressions, usually taken by pressing several fingers straight down together. These impressions provide an additional reference for verifying that the correct fingers were captured and that the rolled impressions are properly associated with each finger.

Digital Fingerprinting

Fingerprints can also be captured electronically using a digital fingerprint scanner. Instead of transferring ink to paper, the scanner records the fingerprint ridge patterns as a digital image.

Digital capture can allow the provider to check the quality of an impression immediately and recapture a finger if the image is unclear. Where the receiving authority accepts electronic submissions, the fingerprint data can then be transmitted through the required system.

The required capture method depends on the specifications of the organization receiving the fingerprints. Some international background checks continue to require fingerprints on a specific physical card, while others accept electronic submissions.

What Makes a Fingerprint Usable?

A fingerprint must contain enough clear ridge detail for reliable examination or comparison. Several factors can affect fingerprint quality, including:

• Insufficient ink or pressure, which can produce faint or incomplete ridge patterns.
• Excessive ink or pressure, which can cause the ridges to blur together.
• Moisture, sweat, or dirt, which can interfere with the clarity of the impression.
• Dry or damaged skin, which may make individual ridge details difficult to capture.
• Movement during capture, which can create smearing or distortion.

For this reason, fingerprint collection is not simply a matter of placing a finger on paper or a scanner. The provider must be skilled in the technicalities of the method.

The fingerprinting process can vary based on why the fingerprints are being collected and which organization will receive them. Before making an appointment, it is important to confirm:

• the required fingerprint format,
• whether ink or electronic capture is accepted, and
• where the completed fingerprints need to be submitted.

For international applications like FBI background checks and RCMP criminal record checks, these requirements can differ between countries and agencies. A fingerprint card accepted for one background check may not be suitable for another. So, applicants should follow the instructions provided by the receiving authority.

Because these requirements differ by country, it helps to work with a provider experienced in international applications.

Globeia, for example, helps individuals arrange fingerprinting for international background checks and identity-verification requirements. These include applications to authorities in countries like the United States, Canada, Australia, the United Kingdom, New Zealand, Singapore, Hong Kong, Japan, France, Italy, Spain, Portugal, and more.

A fingerprint is a small physical detail, but it can carry significant meaning. The same idea of a distinctive “fingerprint” now extends from the patterns on our fingertips to devices, DNA, files, and other forms of identification. In each case, the purpose is similar: using distinctive characteristics to establish what something is, or who it belongs to. For individuals completing a background check or official application, that simple principle becomes a practical tool for proving identity and connecting it to the right records.