How can I increase screen contrast without making text larger?

On Windows 10 or 11, use a contrast theme rather than changing text size. Open Settings > Accessibility > Contrast themes, choose a theme, and select Apply. The theme changes screen colors to make interface content more distinct, and it is separate from text-size controls. [S1] The steps here are for Windows; if you use another device, its controls may differ, so look for instructions specific to that device rather than assuming the Windows path applies.

Before applying a different theme, make a note of the current selection so you can find your way back. Then try a theme and inspect the kinds of screens you use. For example, check a settings page, a document, and a screen with buttons or menus. Ask yourself whether text stands out from its background and whether the controls are easy to pick out. This is a practical preview, not a guarantee that every screen will look the same. If the result makes something harder to distinguish, restore the usual appearance instead of changing text size just to compensate.

Yes. Windows contrast themes change screen colors to make interface content more distinct, so the appearance of interface elements—not just text—can change. [S1] During your preview, check backgrounds, buttons, and menus as well as words. The available Windows guidance describes the themes’ purpose, but does not say exactly how every individual app or screen will look. That is why checking the screens you actually use is more useful than judging the setting from a single page.

On Windows 10 or 11, return to Settings > Accessibility > Contrast themes. Select None in the theme menu, then apply it to return to the usual appearance. [S1] If you noted the original selection, you can use that note to guide your next choice; the documented way to return to the usual appearance is selecting None and applying it. If you are unsure whether you changed contrast or text size, check those controls separately rather than changing both at once.

Windows also includes an option to create a custom contrast theme. [S1] The guidance available here does not detail the custom-theme controls, so use the options shown in your Windows settings rather than relying on a particular control name. Keep text size unchanged if your goal is contrast, and preview the result on common screens. If the custom colors make text or controls less distinct, select None and apply it to return to the usual appearance. [S1]

Use this sequence on Windows 10 or 11:

1. Open Settings > Accessibility > Contrast themes.
2. Note the current selection.
3. Choose a theme and select Apply; leave text-size controls alone.
4. Preview a few screens you use, including text and interface controls.
5. If the result does not help, select None in the theme menu and apply it to return to the usual appearance. [S1]

For another device, use its device-specific instructions; the Windows steps may not match.