How I Built a Free Markdown-to-PDF Converter in the Browser

Last month I shipped MD2PDF Online — a free tool that converts Markdown to PDF, Word, HTML and Mind Map, with zero server-side processing. Everything runs client-side. Here's what I learned building it and why the approach matters. The Problem Most online converters upload your file to a server, process it, then send back the result. This works, but: Your document content leaves your device There are file size limits Server costs scale with usage Privacy concerns for sensitive documents I wanted