Converting your Person of Indian Origin (PIO) card to an Overseas Citizen of India (OCI) card involves several steps and compliance with  NRI Immigration regulations, and also it is advisable to complete the conversion before the PIO card validity expires. Here’s a concise guide on the process:

• Online Application: Visit the OCI services website and start by selecting the option “OCI Registration. Carefully read the instructions and proceed by filling out the application form with the required personal, passport and family details.
• Document Submission: Upload the necessary documents, including a valid passport and your PIO card. Ensure that your photograph and signature meet the specified requirements.
• Fee Payment: Pay the applicable fee..
• Submission to Indian Mission: Print the application form and submit it along with the required enclosures to the nearest Indian Mission or Post, as per your jurisdiction.
• Processing: The Indian authorities will process your application, and any objections or additional requirements will be communicated via the online status enquiry system.

This process falls under NRI Immigration regulations and must be completed to enjoy the benefits of an OCI card, such as lifelong multiple entry visas to India and exemption from police reporting for stays over 180 days​. Ensure all information is accurate and documents are in order to avoid delays.