Web font formats and the Core Web Vitals
92.8% of font-using sites (170,896) serve modern WOFF2 fonts and reach 82% good LCP (1.6s median), while the 28.8% still serving legacy WOFF (78% good LCP) and 17.4% serving uncompressed TTF (79% good LCP) lag behind.
92.8% of sites use WOFF2 fonts web font format, and 82% of those sites have a good LCP, against 82% of all sites.
LCP pass rate
Sites with WOFF2 fonts web font format have a good LCP most often: 82%, against 82% of all sites. Sites with legacy WOFF fonts font formats have it least often, at 78%.
Web font format usage
WOFF2 fonts is the most used: 92.8% of sites.
LCP phase breakdown by web font format
Across the four LCP sub-parts in Chrome's field data, the largest gap between WOFF2 fonts and legacy WOFF fonts sits in time to first byte (TTFB): 667 ms median for WOFF2 fonts against 772 ms for legacy WOFF fonts. Overall median field LCP is 1.6s for WOFF2 fonts (TTFB 667 ms, load delay 334 ms, load duration 146 ms, render delay 228 ms) versus 1.7s for legacy WOFF fonts.
Understanding web font formats
Why WOFF2 replaces legacy WOFF, TTF, and OTF across all modern browsers
WOFF2 uses custom Brotli preprocessing to compress font glyphs ~30% smaller than legacy WOFF and up to 50%+ smaller than raw TTF or OTF files, and has been supported by every major browser since 2016. Across 170,896 font-using sites (92.8%) serving WOFF2, good LCP reaches 82% (1.6s median). Sites still serving legacy WOFF (28.8%, 53,091) drop to 78% good LCP (1.7s median), and sites serving raw TTF (17.4%, 31,968) drop to 79% good LCP (1.6s median).
Declare only format("woff2") in your @font-face src rules and ensure WOFF2 is listed first if legacy fallbacks exist, so modern browsers never download uncompressed TTF or WOFF files. Across all font-using sites, 92.8% serve WOFF2 (82% good LCP) versus 17.4% serving raw TTF (79% good LCP).
How web font format plays out per platform
What the field data shows when you isolate a single CMS or framework.
WordPress 63,649 sites 36.5% of WordPress sites download WOFF and 18.3% download TTF (65% good LCP vs 69% for WOFF2).
Across 63,649 font-using WordPress sites, 94.7% serve WOFF2 (69% good LCP), 36.5% download WOFF (67% good LCP), and 18.3% download TrueType TTF files (65% good LCP, 2.1s median).
Shopify 8,390 stores 99.4% of Shopify stores serve WOFF2 fonts (96% good LCP), while 3.0% load TTF (90%).
Shopify's Liquid font_face filter emits .woff2 and .woff font URLs. Across Shopify storefronts, 99.4% serve WOFF2 (96% good LCP, 1.3s median), 20.8% load WOFF (95% good LCP), and 3.0% load TTF (90% good LCP, 1.6s median).
React & Next.js 9,431 sites React & Next.js sites loading TTF fonts (7.3%) pass LCP 26 points less often than sites on WOFF2 (59% vs 85%).
Across 9,431 font-using React sites, 96.9% serve WOFF2 (85% good LCP, 1.4s median), 14.0% serve WOFF (64% good LCP), and 7.3% serve TTF (59% good LCP, 2.3s median).
By Arjen Karel · 210,902 crawled sites (196,263 with all devices Chrome field data, 184,141 sites with web font format, October 2026). How we measured.