The State of Web Vitals

LCP image format

The image format of the LCP resource.

Field data PhoneDesktopAll Scope All sites Q1 2026 edition · All devices field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for LCP image format

The image format of the LCP resource.

12
Categories
58,649 sites
49.6%
Top share
jpg
1.6s
Top LCP
Median for jpg

49.6% of LCP images are JPEG. 26.8% are WebP, 6.2% AVIF.

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
2

LCP image format who uses what, and how fast each group loads

Median LCP
0
0.5s
1s
1.5s
2s
2.5s
3s
3.5s
4s
avif1.4s6% of sites
gif1.4s1% of sites
webp1.5s27% of sites
jpg1.6s50% of sites
png1.6s15% of sites
svg+xml1.6s2% of sites
*1.9s0% of sites
VariantShare of sitesMedian
avif 3,616 sites
6%
1.4s
gif 323 sites
1%
1.4s
webp 15,689 sites
27%
1.5s
jpg 29,073 sites
50%
1.6s
png 8,632 sites
15%
1.6s
svg+xml 1,250 sites
2%
1.6s
* 58 sites
0%
1.9s

Avif sites post the best median LCP (1.4s). * sites trail at 1.9s. Correlation, not causation. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
3

Passing LCP per LCP image format which group passes the LCP most often

VariantSitesPassing LCPLCP
Avif 6.2% 3,616 90% 1.4s
Gif 0.6% 323 85% 1.4s
Webp 26.8% 15,689 85% 1.5s
Jpg 49.6% 29,073 81% 1.6s
Png 14.7% 8,632 80% 1.6s
Svg+xml 2.1% 1,250 80% 1.6s
* 0.1% 58 67% 1.9s
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good LCP (2.5s at p75) · one value per site

90% of Avif sites pass LCP. Svg+xml trails 10 points behind. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices field datacorewebvitals.io/state-of-cwv
4

Why this matters for the Core Web Vitals, and where to start fixing it

The format sets the bytes per pixel, and the LCP's load time scales with the bytes. The same hero photo is far smaller as AVIF or WebP than as JPEG, and PNG for photos is the classic mistake: a lossless format doing a lossy job. SVG is its own case, tiny and sharp at any size for logos and illustrations.

Nobody should convert images by hand. An image CDN or a build step serves the best format each browser supports from one source file. The format mix is mostly a measure of which sites have that step.

How does this affect the Core Web Vitals?

LCP image format correlates with the LCP. With AVIF, 90% of sites pass the LCP. With PNG, 80% do.

The split is bigger on INP. With JPG, 96% of sites pass it. With GIF, 79% do.

Go fix it Optimize images for Core Web Vitals → JPEG XL and Core Web Vitals → Optimize the LCP image →
Related signals LCP priority hint → LCP origin → LCP responsive markup → LCP discovery → Chrome field data from 94,910 sites, representing millions of real page loads · How we measured