DocRaptor
DocRaptor is an HTML-to-PDF conversion API built on a real Prince XML rendering engine rather than a headless-browser screenshot approach, which gives it noticeably more accurate CSS support for print-specific features — page breaks, headers/footers, running page numbers, and CSS `@page` rules — that many headless-Chrome-based converters handle inconsistently. A web page or HTML string is submitted via a simple POST request along with CSS, and the API returns a rendered PDF (or Word document, on newer plans).
Because developers can build the document layout using familiar HTML/CSS rather than a proprietary templating language, existing web design skills transfer directly to designing invoices, reports, or certificates — a team's frontend developer can build and iterate on the PDF layout the same way they'd build a web page, including using CSS frameworks and existing component styles.
A free tier (test documents watermarked, limited volume) is available for development and testing; production use requires a paid plan billed per document generated. For Nigerian SaaS platforms generating invoices, reports, or certificates where the team already has strong CSS skills but no PDF-specific tooling experience, DocRaptor's HTML/CSS-based approach is usually faster to get pixel-accurate output from than a code-based library like PDFKit.