It usually starts with something simple: "We just need to export a PDF." Sounds straightforward. Until it isn't. At first, everything seems fine. You pick a library, write a few lines of code, and get a PDF output. Done. Then the real problems begin. Not in development — but the moment you deploy. The layout looks completely different from your HTML. Fonts are missing or rendering incorrectly. It works on your machine… but fails in Docker or Linux. Performance drops when processing larger files. And suddenly, licensing becomes a concern you didn't plan for. What felt like a quick task turns into a series of unexpected trade-offs. The truth is, choosing a PDF library in .NET isn't about features — it's about what actually works in production. In this article, we'll take a practical look at some of the most popular .NET PDF libraries in 2026, compare free and paid options, and — more importantly — help you figure out which one actually fits your use case.…