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CSS Font Stack Generator - Online Fallback Fonts

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CSS Font Stack Generator

Build robust font-family stacks with intelligent fallbacks. Preview, customize, and copy ready-to-use CSS.

Popular Presets
Font Library
Your Font Stack 0 fonts + generic
Click fonts from the library or choose a preset above
Generic family:
Live Preview
32px
The quick brown fox jumps over the lazy dog.
CSS Output
font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

Frequently Asked Questions

What is a CSS font stack?

A font stack is a list of fonts in the font-family CSS property, ordered by preference. The browser tries each font in sequence until it finds one installed on the user's system, ensuring text always renders—even if the preferred font is unavailable.

Why do I need fallback fonts?

Not all fonts are installed on every device. Without fallbacks, if your primary font is missing, the browser defaults to a generic font—which may ruin your design. A well-crafted stack preserves your typographic intent across platforms.

What are web-safe fonts?

Web-safe fonts are those commonly installed across most operating systems—like Arial, Georgia, Verdana, and Times New Roman. They're reliable fallbacks but limited in variety. Modern stacks often combine web-safe fonts with system-ui and Google Fonts for broader coverage.

What does system-ui mean?

The system-ui generic family tells the browser to use the operating system's native UI font—SF Pro on macOS/iOS, Segoe UI on Windows, Roboto on Android. It provides a native look and excellent performance since no font files need to be downloaded.

How many fallback fonts should I include?

Typically 3–5 fonts plus a generic family is ideal. Too few and you risk poor fallback; too many adds unnecessary CSS bloat. Focus on fonts with similar x-height and character width for seamless fallback transitions.

Should I use Google Fonts or system fonts?

It depends on your priorities. System fonts load instantly and feel native, while Google Fonts offer more creative choices but add HTTP requests and potentially impact performance. Many developers use Google Fonts as the primary with system font fallbacks.

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