Hermes Markdown

Hermes Markdown is a specialized markdown editor designed specifically for prompt engineering. It provides a local-first approach where all data stays on your device, ensuring complete privacy for your intellectual property and AI prompts. The tool runs entirely in your web browser with no account required, works offline, and is completely free to use.

• Slash Commands - Access 30+ specialized prompt templates by typing / anywhere in the editor. Templates are organized by category including Prompt Foundation, Content Transformation, Content Generation, and Technical templates for developers.

• Local-First Privacy - All content stays in your browser's local storage with no data uploaded to servers. No tracking, analytics, or data collection ensures your sensitive prompts and proprietary techniques remain completely private.

• Token & Quality Metrics - Real-time token estimation (word count × 1.35) helps you stay within LLM context limits. Flesch Reading Ease scores measure prompt clarity, with higher scores indicating easier-to-understand instructions for AI models.

• Clean Copy Feature - The Copy Prompt button automatically strips YAML frontmatter and metadata, giving you clean instruction-only text ready to paste into any AI interface.

• Document Templates - Full document templates provide complete prompt structures for complex tasks including System Contract, Security Red Team, Component Refactor, Database Schema, and various communication templates.

• Table Editor - Create and edit markdown tables visually without writing table syntax manually. Add rows and columns dynamically with automatic markdown formatting.

• Zen Mode - Distraction-free writing environment that hides all UI elements except the editor for focused prompt crafting sessions.

• Export & Import - Export prompts as clean markdown files or PDF. Import existing .md files with full YAML frontmatter preservation for metadata like title, description, and tags.

• Progressive Web App - Install as a standalone app on your device. Works fully offline after initial page load with automatic browser storage saving.

• Customization Options - Choose from multiple monospace fonts (JetBrains Mono, Fira Code, Source Code Pro), adjust font sizes, and toggle between light and dark themes.

To get started, simply visit the website and begin writing. Type / to access the command palette and explore templates like /structure for basic prompt scaffolding, /constraints for scope definitions, or /refactor for code-related prompts. Use the real-time metrics to optimize your prompts before copying them to your preferred AI interface.