This document is a guide detailing the OCS Europe Certification program, which is a voluntary initiative aimed at enhancing awareness and promoting best practices for pellet-loss prevention in the plastics industry. The program provides tools and guidance for companies to implement effective measures against plastic pellet loss, a significant contributor to primary microplastics in marine environments. The certification process includes an external audit to verify adherence to the OCS pledge, resulting in the awarding of an OCS Europe certificate and a listing in the public register of certified companies. The guide outlines the importance of certification, the key recommendations based on six pillars for preventing pellet loss, and the certification process, which includes multiple stages from proposal acceptance to annual surveillance audits and recertification every three years. The document also identifies the target audience for the certification, which includes various pellet-handling facilities across Europe.