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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Convert low-ASCII English letters to lowercase.

Header File

Defined in <SDL3/SDL_stdinc.h>


int SDL_tolower(int x);

Function Parameters

int x character value to check.

Return Value

(int) Returns lowercase version of x, or x if no conversion available.


WARNING: Regardless of system locale, this will only convert ASCII values 'A' through 'Z' to lowercase.

This function returns the lowercase equivalent of x. If a character cannot be converted, or is already lowercase, this function returns x.

Thread Safety

It is safe to call this function from any thread.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryAPIFunction, CategoryStdinc

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