The State of Web Vitals

LCP image format

The image format of the LCP resource.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Desktop field outcomes
Metric LCP INP CLS
1

At a glance the headline numbers for LCP image format

The image format of the LCP resource.

15
Categories
111,844 sites
49.6%
Top share
jpg
1.4s
Top LCP
Median for jpg

49.6% of LCP images are JPEG. 26.6% are WebP, 6.1% AVIF.

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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
pipeg0.8s0% of sites
pjpeg1.1s0% of sites
gif1.3s1% of sites
avif1.4s6% of sites
jpg1.4s50% of sites
svg+xml1.4s2% of sites
webp1.4s27% of sites
png1.4s15% of sites
PNG1.5s0% of sites
*1.8s0% of sites
avif, image/avif2s0% of sites
VariantShare of sitesMedian
pipeg 1 sites
0%
0.8s
pjpeg 8 sites
0%
1.1s
gif 651 sites
1%
1.3s
avif 6,824 sites
6%
1.4s
jpg 55,475 sites
50%
1.4s
svg+xml 2,499 sites
2%
1.4s
webp 29,753 sites
27%
1.4s
png 16,520 sites
15%
1.4s
PNG 2 sites
0%
1.5s
* 104 sites
0%
1.8s
avif, image/avif 1 sites
0%
2s

Pipeg sites post the best median LCP (786ms). Avif, image/avif sites trail at 2.0s. Correlation, not causation. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop field datacorewebvitals.io/state-of-cwv
3

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

VariantSitesPassing LCPLCP
PNG 0% 2 100% 1.5s
Avif, image/avif 0% 1 100% 2.0s
Pipeg 0% 1 100% 786ms
Gif 0.6% 651 90% 1.3s
Avif 6.1% 6,824 89% 1.4s
Webp 26.6% 29,753 88% 1.4s
Jpg 49.6% 55,475 86% 1.4s
Png 14.8% 16,520 84% 1.4s
Svg+xml 2.2% 2,499 83% 1.4s
* 0.1% 104 71% 1.8s
Pjpeg 0% 8 67% 1.1s
X-pict 0% 1 —
X-ms-bmp 0% 2 —
Bmp 0% 2 —
JPEG 0% 1 —
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 Gif sites pass LCP. * trails 19 points behind, leaving 29% of its sites failing. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · desktop 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 GIF, 90% of sites pass the LCP. With Svg+xml, 83% 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 189,915 sites, representing millions of real page loads · How we measured