The State of Web Vitals

LCP image format

The image format of the LCP resource.

Field data PhoneDesktopAll Scope All sites Q1 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.

12
Categories
58,649 sites
49.6%
Top share
jpg
95ms
Top INP
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 · 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
png96ms15% of sites
avif97ms6% of sites
webp104ms27% of sites
svg+xml108ms2% of sites
gif112ms1% of sites
*138ms0% of sites
VariantShare of sitesMedian
jpg 29,073 sites
50%
95ms
png 8,632 sites
15%
96ms
avif 3,616 sites
6%
97ms
webp 15,689 sites
27%
104ms
svg+xml 1,250 sites
2%
108ms
gif 323 sites
1%
112ms
* 58 sites
0%
138ms

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

The State of Web Vitals · Q1 2026 · 94,910 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% 29,073 95% 95ms
Webp 26.8% 15,689 93% 104ms
Png 14.7% 8,632 91% 96ms
Svg+xml 2.1% 1,250 87% 108ms
Avif 6.2% 3,616 87% 97ms
* 0.1% 58 79% 138ms
Gif 0.6% 323 72% 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

95% of Jpg sites pass INP. Gif trails 23 points behind, leaving 28% of its sites failing. computed

The State of Web Vitals · Q1 2026 · 94,910 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, 88% of sites pass the LCP. With PNG, 79% do.

The split is bigger on INP. With JPG, 95% of sites pass it. With GIF, 72% 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