Overview

Forgery is the making, adapting or imitating of an object, document, signature or work of art with the intent to deceive another person. Typical targets include contracts, identification papers, signatures, diplomas, banknotes and artworks. Because the act is intended to mislead, forgery is treated as a form of fraud in most legal systems and can lead to criminal charges and civil liability.

Common types and techniques

Forgery appears in many forms, each with different techniques and motives. Examples include forged signatures on checks or wills; altered or fabricated identity documents; imitated paintings created to pass as originals; and reproductions of currency. When money or certain government-issued items are imitated, the practice is often called counterfeiting.

History and importance

Attempts to pass false documents or art have accompanied literate societies for centuries. Advances in printing, photography and digital editing have expanded opportunities for forgery while also prompting stronger security measures. Because forgery can undermine trust in financial systems, legal records and cultural heritage, it is regarded as a serious social and economic problem.

Detection and prevention

  • Forensic document examination: handwriting analysis, ink and paper testing, and microscopic inspection.
  • Scientific methods: spectroscopy, radiography and pigment dating for artworks.
  • Security design: watermarks, holograms, microprinting, and digital signatures to deter alteration.
  • Provenance and recordkeeping: documentary chains that establish origin and ownership of objects.

Legal definitions vary but typically require a false making or alteration plus intent to deceive. Penalties depend on the nature of the forgery and the harm caused. It is distinct from related offenses such as identity theft or document fraud in scope and method, and it overlaps with fraud and counterfeiting where financial instruments or state-issued items are involved. Courts also consider questions of authenticity in civil disputes over artworks or contracts.

Notable considerations

Investigations of alleged forgeries often involve expert testimony and specialized laboratories. Prevention combines legal deterrence, public awareness and technical safeguards. For collectors, businesses and public institutions, maintaining rigorous authentication practices reduces the risk that forged items will enter circulation or influence decisions.