The State of Web Vitals

LCP image format

The image format of the LCP resource.

Field data PhoneDesktopAll Scope All sites Q2 2026 edition · Phone 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
111,716 sites
49.6%
Top share
jpg
95ms
Top INP
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 · phone field datacorewebvitals.io/state-of-cwv
2

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

Median INP
0
100ms
200ms
300ms
400ms
500ms
jpg95ms50% of sites
png97ms15% of sites
avif97ms6% of sites
webp105ms27% of sites
svg+xml106ms2% of sites
gif112ms1% of sites
*132ms0% of sites
VariantShare of sitesMedian
jpg 55,415 sites
50%
95ms
png 16,502 sites
15%
97ms
avif 6,818 sites
6%
97ms
webp 29,710 sites
27%
105ms
svg+xml 2,498 sites
2%
106ms
gif 651 sites
1%
112ms
* 104 sites
0%
132ms

Little daylight between the groups: every variant sits near 95ms median INP. computed

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

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

VariantSitesPassing INPINP
Jpg 49.6% 55,415 94% 95ms
Webp 26.6% 29,710 93% 105ms
Png 14.8% 16,502 91% 97ms
Svg+xml 2.2% 2,498 90% 106ms
Avif 6.1% 6,818 86% 97ms
* 0.1% 104 83% 132ms
Gif 0.6% 651 75% 112ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site

94% of Jpg sites pass INP. Gif trails 19 points behind. computed

The State of Web Vitals · Q2 2026 · 189,915 sites · phone 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, 89% of sites pass the LCP. With PNG, 78% do.

The split is bigger on INP. With JPG, 94% of sites pass it. With GIF, 75% 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