Free Pascal (FPK Pascal) for Windows is a 32-bit Pascal compiler.

Free Pascal (FPK Pascal) language syntax is semantically compatible with Turbo Pascal 7.0. Some extensions used by Delphi are also supported. These are: classes, rtti, exceptions, and ansi strings.

Additional features include: procedure and operator overloading support, a code optimizer, a peephole optimizer, the ability to load variables into registers, an assembler level dataflow analyzer, stack frame eliminations, an integrated BASM (built-in assembler) parser, smart linking, support for the GNU debugger, and cross-platform API support.