# SDL_free Free allocated memory. ## Header File Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h) ## Syntax ```c void SDL_free(void *mem); ``` ## Function Parameters | | | | | ------ | ------- | --------------------------------------- | | void * | **mem** | a pointer to allocated memory, or NULL. | ## Remarks The pointer is no longer valid after this call and cannot be dereferenced anymore. If `mem` is NULL, this function does nothing. ## Thread Safety It is safe to call this function from any thread. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_malloc](SDL_malloc) - [SDL_calloc](SDL_calloc) - [SDL_realloc](SDL_realloc) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)