CSS Font Size Adjust Preview
Generate font-size-adjust CSS for fallback fonts with different x-heights.
What the CSS Font Size Adjust does
Generate font-size-adjust CSS for fallback fonts with different x-heights. A body font fallback can preserve readable lowercase height when the preferred font is unavailable Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: The value depends on the chosen font metrics, so compare with real fallback fonts.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the CSS Font Size Adjust do?
Generate font-size-adjust CSS for fallback fonts with different x-heights. A body font fallback can preserve readable lowercase height when the preferred font is unavailable.
What should I keep in mind?
The value depends on the chosen font metrics, so compare with real fallback fonts
Does it upload my input?
No. The CSS Font Size Adjust runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.