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
85ms
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 · all devices 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
jpg85ms50% of sites
png85ms15% of sites
avif86ms6% of sites
svg+xml90ms2% of sites
webp92ms27% of sites
gif94ms1% of sites
*96ms0% of sites
VariantShare of sitesMedian
jpg 29,073 sites
50%
85ms
png 8,632 sites
15%
85ms
avif 3,616 sites
6%
86ms
svg+xml 1,250 sites
2%
90ms
webp 15,689 sites
27%
92ms
gif 323 sites
1%
94ms
* 58 sites
0%
96ms

Little daylight between the groups: every variant sits near 85ms median INP. computed

The State of Web Vitals · Q1 2026 · 94,910 sites · all devices 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 96% 85ms
Webp 26.8% 15,689 96% 92ms
Png 14.7% 8,632 95% 85ms
Svg+xml 2.1% 1,250 94% 90ms
Avif 6.2% 3,616 92% 86ms
* 0.1% 58 85% 96ms
Gif 0.6% 323 79% 94ms
Good Needs Improvement Poor Sorted best-passing first · median colored by its own rating · pass = good INP (200ms at p75) · one value per site

96% of Jpg sites pass INP. Gif trails 17 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