The State of Web Vitals

LCP image format

The image format of the LCP resource.

Field data PhoneDesktopAll Scope All sites Q2 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.

15
Categories
111,844 sites
49.6%
Top share
jpg
85ms
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 · 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
x-ms-bmp47ms0% of sites
avif, image/avif60ms0% of sites
pipeg62ms0% of sites
bmp64ms0% of sites
JPEG65ms0% of sites
x-pict72ms0% of sites
pjpeg79ms0% of sites
PNG79ms0% of sites
jpg85ms50% of sites
png85ms15% of sites
avif86ms6% of sites
svg+xml90ms2% of sites
*90ms0% of sites
webp92ms27% of sites
gif94ms1% of sites
VariantShare of sitesMedian
x-ms-bmp 2 sites
0%
47ms
avif, image/avif 1 sites
0%
60ms
pipeg 1 sites
0%
62ms
bmp 2 sites
0%
64ms
JPEG 1 sites
0%
65ms
x-pict 1 sites
0%
72ms
pjpeg 8 sites
0%
79ms
PNG 2 sites
0%
79ms
jpg 55,475 sites
50%
85ms
png 16,520 sites
15%
85ms
avif 6,824 sites
6%
86ms
svg+xml 2,499 sites
2%
90ms
* 104 sites
0%
90ms
webp 29,753 sites
27%
92ms
gif 651 sites
1%
94ms

Little daylight between the groups: every variant sits near 47ms median INP. computed

The State of Web Vitals · Q2 2026 · 189,915 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
Pipeg 0% 1 100% 62ms
Avif, image/avif 0% 1 100% 60ms
Pjpeg 0% 8 100% 79ms
Bmp 0% 2 100% 64ms
JPEG 0% 1 100% 65ms
X-pict 0% 1 100% 72ms
X-ms-bmp 0% 2 100% 47ms
Jpg 49.6% 55,475 96% 85ms
Webp 26.6% 29,753 96% 92ms
Png 14.8% 16,520 94% 85ms
Svg+xml 2.2% 2,499 94% 90ms
Avif 6.1% 6,824 91% 86ms
* 0.1% 104 89% 90ms
Gif 0.6% 651 80% 94ms
PNG 0% 2 50% 79ms
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 16 points behind. computed

The State of Web Vitals · Q2 2026 · 189,915 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.

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