As of October 8, 2026, LazySizes is used by 1,495,151 websites in the TechLeads index: 1.1% of all JavaScript libraries detections, the 18th most-used of 357 JavaScript libraries technologies.
1,495,151
websites using LazySizes
1.1%
share of JavaScript libraries
#18
of 357 in JavaScript libraries
Cite this data
Quoting these numbers? Credit TechLeads with a link to this page.
Citation
TechLeads. "LazySizes Customers and Market Share." Data as of October 8, 2026. https://techleads.fyi/technology/lazysizes/market-share
In HTTP Archive's monthly crawl of public websites, LazySizes was detected on 3,444,537 pages in September 2026, down 14.4% from a year earlier (peak: 4,688,787). Among the 1,000 most-visited sites, it appeared on 120. HTTP Archive is a separate dataset from the TechLeads index, so its numbers are not added to ours.
Same month, other JavaScript Libraries technologies in HTTP Archive: jQuery 32,400,479, core-js 20,296,277, jQuery Migrate 14,931,388, jQuery UI 10,564,965, Swiper 7,844,933.
LazySizes customers by country
Based on country-code domains (such as .de or .co.uk); websites on .com and other generic domains are not assigned a country.
TechLeads scans public websites and detects LazySizes from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is LazySizes's website count divided by the website counts of all JavaScript libraries technologies we track; a site using two JavaScript libraries tools counts for both. Counts were last refreshed on October 8, 2026 and update daily.
FAQ
LazySizes accounts for 1.1% of JavaScript libraries detections in the TechLeads index (1,495,151 websites), which makes it the 18th most-used of 357 JavaScript libraries technologies we track.