I run a small company and only issue two or three invoices a month, so I’m after a lightweight Windows-compatible program that lets me fill in basic details and instantly save or print the result as a PDF. Core needs • Windows desktop app or script—no web component needed. • Input fields for my company name, address, customer details, an itemised list of products or services, and payment terms. • A clean, standard template is fine; no custom colours or logos required. • One-click export to PDF that preserves the layout for printing or emailing. If you can package this as a simple executable (or an easy-to-run Python, C#, or similar script) with clear instructions, that’s all I need.