Web Font Performance Calculator

Analyze font loading impact on your site performance

Select Fonts
Font Weights & Styles
Configuration

Font Summary

Fonts Selected: 0
Total Variants: 0
Total Size: 0 KB
Compression (brotli): 0 KB

Load Performance

Load Time: 0 ms
FOUT Duration: 0 ms
Font Swap Time: 0 ms
Strategy: FOUT

FOUT

+ Faster visible text
- Text layout shift

FOIT

+ No layout shift
- Invisible text delay

Swap

+ Fast fallback shown
- Font still loads

Optional

+ Minimal impact
- Font may not load

Load Timeline

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Made by one person, free to use.

I started krzen in April 2026 and have built the image compressor plus 25 page-speed tools since. I pay for the domain and the hours myself. A small tip keeps it going. The tools stay free either way.

Michael

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