ThermalMarky is a web application and CLI tool that converts Markdown text into formatted ESC/POS commands for thermal receipt printers. The system is built with FastAPI for the HTTP server and python-escpos for printer communication. It features a clean web UI (single HTML page with Bootstrap) and a command-line interface for piping or file input. The architecture is a straightforward monolith: the web endpoint accepts markdown, saves it to a temporary file, then invokes the CLI script via subprocess. The core library modules handle configuration (with content overrides via HTML comments), input loading (stdin/file), markdown parsing into tokens with formatting (bold, underline, headers, alignment, QR codes), and printer output with line-width wrapping and truncation. The project includes proper Docker support and environment variable configuration. It demonstrates good separation of concerns and a non-trivial markdown-to-ESC/POS converter that handles inline format toggling and scaled text width calculations.