Samsung
High Contrast Keyboard: Turn On or Off auf Samsung
Samsung Keyboard renders keys in a standard color palette by default. On some displays or in bright ambient light, this low-contrast look makes letters and symbols harder to distinguish quickly.
The High contrast keyboard option is an accessibility setting inside Samsung Keyboard settings. Turning it on changes the background and key colors and increases key size at the same time, since both changes are tied to the same toggle.
To enable or disable it, go to Settings ➔ General management ➔ Samsung Keyboard settings ➔ High contrast keyboard.
Tap the toggle to switch it on or off. The keyboard updates immediately, so you can preview the new colors and size before leaving the settings screen.
The exact color scheme and key layout of the high-contrast design differ slightly between Samsung models and firmware versions. If the option is missing from Samsung Keyboard settings, check whether Samsung Keyboard is set as your active input method under keyboard settings, since third-party keyboards do not offer this toggle.
If you need larger text everywhere rather than just on the keyboard, a system-wide font size or display size setting is a better fix than this keyboard-specific option.