Ghostwriter

Ghostwriter is a Microsoft Office add-in that integrates OpenAI's ChatGPT directly into applications like Word, PowerPoint, and Outlook, enabling users to generate, refine, and manage written content without switching contexts. The tool is designed for professionals, students, writers, and business teams who need to produce documents, reports, emails, presentations, and creative material more efficiently. With over 2 million installs, Ghostwriter offers a privacy-first approach: all processing occurs locally within the user's Microsoft environment, and no user data is stored or sold to third parties. This makes it suitable for industries with strict data protection requirements, such as legal, medical, finance, and education. The add-in provides a rich set of features. Its core function is an AI writing assistant that can brainstorm ideas, outline structures, draft paragraphs, rewrite sentences, summarize text, and adjust tone or style. Users can invoke these actions via a sidebar or inline suggestions. The "Quick Action" prompts allow one-click tasks like generating bullet points, expanding on a topic, or creating a professional email reply. Ghostwriter also includes 50 specialized "Agents/Personas"—predefined AI roles such as a legal advisor, marketing copywriter, technical writer, academic editor, or creative storyteller. Each persona tailors the output to a specific domain, vocabulary, and format. For example, the "Resume Writer" persona can help craft job application materials, while the "Ghostwriter for Business" persona generates formal proposals and memos. In addition to text generation, Ghostwriter supports real-time collaboration: multiple users can access the same document and use the AI to co-edit sections simultaneously. The add-in also offers a "Rewrite wi