Flying Saucer

Flying Saucer is an open-source Java library for rendering XHTML and CSS, with support for generating PDF output. It is typically used by developers who need to turn server-side HTML/XML templates into paged documents such as invoices, reports, or letters.

The project is best known as a renderer rather than a full PDF editor. It focuses on standards-based layout from well-formed XHTML and CSS, and is commonly paired with Java PDF backends such as iText or OpenPDF for PDF creation. A distinguishing trait is its emphasis on Java-based XHTML/CSS rendering for print-style documents.