---
name: "fluid"
section: "1"
platform: "linux"
package: "fltk"
version: "1.4.5-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/fluid"
---

# fluid(1)

the fast light user-interface designer

## NAME

fluid - the fast light user-interface designer

## SYNOPSIS

fluid \[ -c \[ -o *code-filename* -h *header-filename* \] \] \[ *filename.fl* \]

## DESCRIPTION

*fluid* is an interactive GUI designer for FLTK. When run with no arguments or with a filename, *fluid* will display the GUI hierarchy and any windows defined in the file. Functions, classes, windows, and GUI components can be manipulated as needed.

When used with the *-c* option, *fluid* will create the necessary C++ header and code files in the current directory. You can override the default extensions, filenames, and directories using the *-o* and *-h* options.

## SEE ALSO

[fltk-config(1)](/fltk-config/1.md), [fltk(3)](/fltk/3.md)\
 FLTK Programming Manual, Chapter 9\
 FLTK Web Site, https://www.fltk.org/

## AUTHORS

Bill Spitzak and others.