Show HN: A graph paper generator that renders vector PDFs in the browser

A free, browser-based graph paper generator allows users to create and download print-ready PDFs in various styles—including square grids, dot grids, isometric, hexagon, and Cornell notes—without login or watermarks. The tool supports multiple paper sizes from the ISO A/B/C and US/Imperial series, with customizable spacing, colors, and margins that preview in real-time before export. Users can select pre-made templates or build custom layouts and print at 100% scale for accurate grid measurements.