How to enable night mode in Safari browser?

Enabling night mode, or a dark theme, in the Safari browser is not governed by a single universal setting within the application itself, but rather through a coordinated system-level approach on Apple's platforms. The primary and most effective method is to activate the system-wide Dark Mode on your macOS or iOS/iPadOS device. On a Mac, you navigate to System Settings (or System Preferences in older versions), select "Appearance," and choose "Dark." On an iPhone or iPad, you go to Settings, then "Display & Brightness," and select the Dark appearance. Once this is enabled, Safari and most other native applications will automatically adopt a dark interface, transforming the browser's toolbars, tabs, and menus. This system-level integration ensures a consistent visual experience across the operating system and is the method Apple intends users to employ for a comprehensive dark theme.

For the specific content of web pages—turning white backgrounds dark—Safari relies on a separate but complementary feature called Reader Mode. This is not a blanket "night mode" for all websites but a tool that strips away most formatting to present article text in a customizable, distraction-free view. To use it, navigate to a compatible article-based webpage and tap or click the Reader icon (which resembles a set of lines) in the address bar. Once in Reader Mode, you can click the "AA" text controls button to access display settings, where you can select a background color theme such as "Dark" or "Sepia." This provides an excellent reading experience for long-form content but is not a global solution for dynamic sites like webmail or social media platforms.

On iOS and iPadOS, a more comprehensive solution for darkening website content globally is available through a feature called "Smart Invert" or "Classic Invert," which is an accessibility function. This can be found in Settings > Accessibility > Display & Text Size > Smart Invert. When enabled, it intelligently inverts colors on the display while preserving media and some app appearances. In Safari, Smart Invert will typically transform bright websites into dark versions, though its effectiveness varies depending on how a site is coded; some graphical elements may not invert as intended. It is a powerful workaround but exists outside Safari's direct settings, reflecting its origin as an accessibility tool rather than a dedicated browsing feature.

Therefore, achieving a full night mode experience in Safari involves understanding these layered mechanisms: system Dark Mode for the browser chrome, Reader Mode for formatted articles, and accessibility settings like Smart Invert for a broader, though less precise, website transformation. There is no single toggle within Safari's preferences labeled "night mode" because Apple has architected the functionality to be part of the broader ecosystem. The implication is that users seeking this visual style must engage with system settings, accepting that control over web content is either context-specific (Reader) or a system-wide override (Invert), rather than a per-site or built-in browser preference.