This was a fun project I used to learn about Fabric JS and some other JS libraries. It's all serverless and most everything executes right in the browser, including the PDF generation. Since there's no backend, it saves the card state right in the URL. This creates some rather massive URL for complicated card designs, but in most of my testing, it seemed to work alright. Let me know if anything seems off.
My example card: https://emojify.cards/?canvas-0=%F0%9F%91%8B+1057+222+12.729...