Formatting Objects Processor

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Apache FOP
Original author(s)	James Tauber
Developer(s)	Apache Software Foundation
Stable release	2.11[1] / 28 April 2025; 60 days ago (28 April 2025)
Repository	github.com/apache/xmlgraphics-fop
Written in	Java
Operating system	Cross-platform
Type	XSL-FO
License	Apache License 2.0
Website	xmlgraphics.apache.org/fop

Formatting Objects Processor (FOP, also known as Apache FOP) is a Java application that converts XSL Formatting Objects (XSL-FO) files to PDF or other printable formats. FOP was originally developed by James Tauber who donated it to the Apache Software Foundation in 1999. It is part of the Apache XML Graphics project.

FOP is open source software, and is distributed under the Apache License 2.0.