GTK Developer Matthias Clasen gtk4-builder-tool 1 User Commands gtk4-builder-tool GtkBuilder file utility gtk4-builder-tool COMMAND OPTION FILE gtk4-builder-tool can perform various operations on GtkBuilder .ui files. You should always test the modified .ui files produced by gtk4-builder-tool before using them in production. The following commands are understood: validate Validates the .ui file and report errors to stderr. simplify Simplifies the .ui file by removing properties that are set to their default values and write the resulting XML to stdout, or back to the input file. enumerate Lists all the named objects that are created in the .ui file. preview Preview the .ui file. This command accepts options to specify the ID of an object and a .css file to use. The simplify command accepts the following options: --replace Write the content back to the .ui file instead of stdout. --3to4 Transform a GTK 3 ui file to GTK 4 The preview command accepts the following options: --id=ID The ID of the object to preview. If not specified, gtk4-builder-tool will choose a suitable object on its own. --css=FILE Load style information from the given .css file.