ASN1C includes a graphical user interface (GUI) wizard that can be used as an alternative to the command-line version. It is a cross-platform GUI and has been ported to Windows and several UNIXes. The GUI makes it possible to specify ASN.1 files and configuration files via file navigation windows, to set command line options by checking boxes, and to get online help on specific options.

The Windows installation program should have installed an ‘ASN1C Compiler’ option on your computer desktop and an ‘ASN1C’ option on the start menu. The wizard can be launched using either of these items. The UNIX version should be installed in ASN1C_INSTALL_DIR/bin; no desktop shortcuts are created, so it will be necessary to create one or to run the wizard from the command-line.

The C# GUI differs little from the C/C++ GUI; screenshots may include references to C or C++ directories, but the common code options are identical.