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About DFM Files

A .dfm file is a form file used by Delphi to store the design and settings of a program's visual interface. DFM files typically contain information about forms and the controls placed on them, such as buttons, text fields, menus, and other interface elements, including their size, position, appearance, and properties. The files can be stored as text or in a binary format, depending on the Delphi version and how the project was configured.

Delphi introduced DFM files as part of its visual development environment, which was originally released by Borland in the mid-1990s. Developers use DFM files when creating Windows and other applications with Delphi, allowing them to design interfaces visually while storing the corresponding form information separately from the program's source code. You may encounter .dfm files when maintaining Delphi applications, working with older Borland software projects, studying Delphi source code, or developing applications with a compatible Delphi environment.

You can open and view a text-based .dfm file with a source code editor or plain text editor, while binary DFM files require a compatible Delphi tool or another application that supports the format. To edit the form as part of a Delphi project, you generally need Delphi or a compatible development environment.