Websites using Google tag (gtag.js)
The Google tag (gtag.js) is Google's single tagging library for Google Analytics 4, Google Ads and Floodlight. About 439,748 websites in the PageSourceSearch index contain the code that reveals it; the 49 highest-ranked are listed below.
How is Google tag (gtag.js) detected?
The install snippet loads gtag.js from www.googletagmanager.com/gtag/js with the measurement or conversion id. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
www.googletagmanager.com/gtag/js Search the index for it
A literal is matched byte for byte, case-sensitively. Combine it with another keyword, a domain, a kind or a date filter on the search page to narrow the list. About Google tag (gtag.js)
Top 50 websites using Google tag (gtag.js)
Ranked by the domain's position in the crawl's ranked list (Common Crawl harmonic centrality), highest first. view source opens the stored page or script with the match highlighted. Computed 2026-10-10 15:14:21 UTC; the list stopped short of 50 because the search's budget ran out.
How it appears in the source
From mozilla.org (js):
.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtag/js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','data
Questions about finding Google tag (gtag.js)
- How does PageSourceSearch know a website uses Google tag (gtag.js)?
- By the source itself: The install snippet loads gtag.js from www.googletagmanager.com/gtag/js with the measurement or conversion id. PageSourceSearch stores the raw HTML and first-party JavaScript of each crawled site and matches the keyword byte for byte, so every listed site's stored source contains it.
- Is this a complete list of websites using Google tag (gtag.js)?
- No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 439,748 websites that do; the count is the index's estimate at the time the list was computed. Run the keyword as a search to page through all of them, or add a kind or date filter.
- How do I find websites that use Google tag (gtag.js) together with another technology?
- Search for both keywords at once: several terms separated by spaces must all be found on the same site, or with the Same page toggle in the same page. For example www.googletagmanager.com/gtag/js with wp-content/plugins/ lists the WordPress sites that use Google tag (gtag.js).