Font Fallback Tester — Preview Font Stacks in Action
Preview how your website or app text renders with fallback fonts when the primary font is unavailable. Upload a font or use Google Fonts, test system-safe alternatives, and copy ready-to-use CSS.
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Test Your Font Fallback Stacks Easily
Use the Font Fallback Tester to see how your text will look if the primary font fails to load. Whether you're using a Google Font, a self-hosted TTF, or a WOFF file, this tool previews how your fallback stack behaves across common devices.
Key Features
- Upload custom font files in TTF, OTF, WOFF, or WOFF2
- Select from all popular Google Fonts
- Preview live with or without the primary font
- Toggle between font source modes (upload vs Google)
- Adjust font size and fallback stack dynamically
- Export ready-to-use CSS code
Common Fallback Stacks
These are standard font stacks used across the web to ensure content remains legible when a primary font is unavailable.
| Category | Stack |
|---|---|
Sans-Serif | Arial, Helvetica, sans-serif |
Serif | Georgia, Times, 'Times New Roman', serif |
Monospace | Courier New, Consolas, monospace |
System UI | -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif |
When Should You Use This Tool?
- Designing resilient typography systems for the web
- Comparing Google Fonts vs native font rendering
- Generating CSS with proper fallbacks for production
- Previewing accessibility in low-bandwidth scenarios
How to Use the Font Fallback Tester
- Choose between uploading a font or selecting from Google
- Select a fallback font stack from common presets
- Type or paste text into the preview area
- Adjust font size and observe side-by-side rendering
- Copy the generated CSS snippet for use in your code
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