PrivyMermaid is a free Chrome extension designed for creating and editing Mermaid diagrams with a strong emphasis on privacy. This local-first editor allows users to generate diagrams using natural language descriptions and provides a split-pane layout for real-time editing and previewing. The extension features theme support for instant SVG previews and options to export diagrams in various formats including SVG, PNG, or .mermaid source files. Users can also zoom in and validate their diagrams, enhancing the editing experience.

The program integrates a local AI component, Ollama, which facilitates generating, fixing, and refactoring diagrams directly on the user's device. Users can ask questions regarding their diagrams, correct broken Mermaid syntax, and improve the readability of their diagrams without needing an internet connection. With a user-friendly interface and a commitment to privacy—ensuring that all data remains on the local machine—PrivyMermaid is an excellent tool for developers and writers looking for efficient diagram editing without compromising their data security.