System Font Stack Generator

How to use

1. 1Pick a system font stack: the sans default suits most UI, or choose system-ui, GitHub, Bootstrap, Tailwind, serif, or monospace.
2. 2Edit the preview text and adjust the size, weight, and light or dark background to see the stack render.
3. 3Review the ordered font list to confirm which name the browser tries first and which generic family is the fallback.
4. 4Choose an output format: a CSS rule, a CSS variable, a Tailwind config snippet, or the bare value, and set the selector, property name, or key.
5. 5Copy the generated code and paste it into your stylesheet, theme tokens, or Tailwind config.

About this tool

System Font Stack Generator builds the font-family value you reach for when you want text to use the operating system's own interface font instead of a downloaded web font. A native or system font stack lists each platform's UI typeface in priority order: -apple-system and BlinkMacSystemFont for San Francisco on macOS and iOS, Segoe UI on Windows, Roboto on Android, and the common Linux defaults such as Cantarell, Ubuntu, and Noto Sans, finished with a generic family keyword as the guaranteed fallback. Choosing the system font has real benefits. The fonts already ship with the device, so there is no extra network request, no flash of unstyled or invisible text while a web font downloads, and no layout shift when it finally arrives. Text also matches the rest of the user's apps, which makes an interface feel native. The catch is that the exact list is easy to get wrong: the Apple entries are order sensitive, the modern system-ui and ui-sans-serif keywords belong at the front of the stacks that use them, the generic family must come last, and color emoji only keep rendering if you append the right emoji fallbacks. This tool removes the guesswork by keeping several battle-tested stacks ready to use: a safe sans default for product UI, the one-keyword system-ui stack, the real stacks shipped by GitHub, Bootstrap, and Tailwind CSS, a native serif for long-form reading, and a monospace stack for code and tabular data. A live preview renders your own text in the selected stack at any size and weight, on a light or dark background, so you can see how it looks before you commit, and the ordered font list shows exactly which name the browser will try first and which is the final fallback. When you are ready, copy the result in the form your codebase needs: a complete CSS rule with a selector you choose, a CSS custom property plus a var() reference, a Tailwind fontFamily config snippet keyed however you like, or just the bare font-family value to drop into an existing rule. Everything is generated in your browser, so nothing you type is uploaded.

Free to use. Works in your browser. No signup, no login.