tinypdf
Minimal PDF creation library
...The library supports essential primitives like writing text, drawing basic shapes, and placing JPEG images, which covers common needs such as invoices, receipts, tickets, and simple reports. It also supports clickable links so generated documents can include interactive URLs, and it can create multi-page documents with custom page sizes. A notable convenience is built-in markdown-to-PDF conversion for common structures like headers and lists, letting you go from formatted text to a PDF layout quickly.