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Resource Compiler (rcc)

The rcc tool is used to embed resources into a Qt application during the build process. It works by generating a C++ source file containing data specified in a Qt resource (.qrc) file.


rcc [options] <inputs>

RCC accepts the following command line options:

Option Argument Description
-o file Write output to file rather than to stdout.
-g, --generator <cpp|python|python2> Select generator.
-name name Create an external initialization function with name.
-threshold level Specifies a threshold level (as a percentage) to use when deciding whether to compress a file. If the reduction in the file size is greater than the threshold level, it is compressed; otherwise, the uncompressed data is stored instead. The default threshold level is 70%, meaning that compressed files which are 30% or less of their original size are stored as compressed data.
-compress-algo algorithm The algorithm to compress files with. Supported algorithms are zstd, zlib, and none, which respectively mean to compress the content using the Zstandard library, zlib library, and no compression. The default is zstd if that library was found at compile time, zlib if not.
-compress level Compress input files to the given compression level, which is algorithm-dependent. If the algorithm is zstd, the valid levels are 1 to 19, with the special values of 0 and -1 meaning libzstd's and rcc's default compressions. If the algorithm is zlib, the level is an integer in the range 1 to 9. For both algorithms, level 1 does the least compression but is fastest. Levels 9 or 19 do the most compression but are slowest. To turn off compression, use -no-compress. The default value for level is -1.
-root path Prefix the resource access path with path. The default is no prefix.
-no-compress Disable compression.
--pass <number> Pass number for big resources
-binary Output a binary file for use as a dynamic resource.
-version Display version information.
-help Display usage information.
-t, --temp <file> Use temporary <file> for big resources.
--namespace Turn off namespace macros.
--verbose Enable verbose mode.
--list Only list .qrc file entries, do not generate code.
--list-mapping Only output a mapping of resource paths to file system paths defined in the .qrc file, do not generate code.
-d, --depfile <file> Write a depfile with the .qrc dependencies to <file>.
-project Output a resource file containing all files from the current directory.
--format-version <number> The RCC format version to write.

See also The Qt Resource System for more information about embedding resources in Qt applications.

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