NICH: GPT Anonymizer is a browser-based tool that anonymizes sensitive text before sending prompts to AI services like ChatGPT or DeepSeek, and restores original data from AI responses. It uses AI-powered entity recognition to detect and mask names, personal details, company information, emails, phone numbers, addresses, and custom data. All processing happens locally on the user's device, ensuring privacy. The tool is free and open-source, targeting professionals who need to use AI while protecting confidential information.