World Trademark Search is a trademark research resource that brings together records from the United States Patent and Trademark Office (USPTO) and the European Union Intellectual Property Office (EUIPO). Its searchable database covers more than 16.6 million live US and EU trademark records, with indexable pages organized by mark, owner and Nice classification. Users can search by name, browse by class or country, and explore the latest registrations from each office side by side.

The site supports practical research through tools and information for naming a brand, checking name availability and clearance, and understanding filing costs. Its Nice classification directory spans goods such as cosmetics, software, apparel and food, as well as services including advertising, finance, education, technology, restaurants and legal services. Insights and trends provide additional context on trademark activity. World Trademark Search describes itself as a reader for the USPTO and EUIPO registers, compiled by Oliver Wakefield-Smith. It also explains its sources and methodology, notes that its register mirrors may lag behind the offices’ live data, and provides privacy information and terms of use.