Free Pascal

Key Features

Free Pascal is a professional compiler, offering broad compatibility, cross-platform support, and a commitment to open-source development.

Why Choose Free Pascal?

Discover the advantages of using Free Pascal for your next project, from its robust performance to its supportive community.

Code Examples

See how simple and powerful Free Pascal can be. Here are a few examples to get you started.

program HelloWorld;
begin
  WriteLn('Hello, World!');
end.

program FileIOExample;
var
  F: TextFile;
  s: string;
begin
  Assign(F, 'test.txt');
  Rewrite(F);
  WriteLn(F, 'Writing to a file.');
  Close(F);

  Reset(F);
  ReadLn(F, s);
  WriteLn(s);
  Close(F);
end.

program ClassesExample;
type
  TShape = class
  public
    function Area: Real; virtual; abstract;
  end;

  TCircle = class(TShape)
  private
    FRadius: Real;
  public
    constructor Create(Radius: Real);
    function Area: Real; override;
  end;

constructor TCircle.Create(Radius: Real);
begin
  FRadius := Radius;
end;

function TCircle.Area: Real;
begin
  Result := Pi * Sqr(FRadius);
end;

var
  MyCircle: TCircle;
begin
  MyCircle := TCircle.Create(10);
  WriteLn('Area: ', MyCircle.Area:0:2);
  MyCircle.Free;
end.

Get Started with Free Pascal

Join the Community

The Free Pascal community is active and welcoming. Participate in the forums, report bugs, or contribute to the project.

Download Free Pascal

Choose the version suitable for your operating system.

x86/x64

Windows Linux macOS Other Platforms

ARM64

Linux macOS

For GUI development, we recommend using Lazarus IDE.

View Changelog