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Yoast SEO in Homepage Source

Yoast SEO is the most-installed WordPress SEO plugin; it manages titles, meta descriptions, XML sitemaps and the schema block on a large share of WordPress sites.

The source-code fingerprint

Yoast wraps its head output in an HTML comment, 'This site is optimized with the Yoast SEO plugin', so the phrase Yoast SEO plugin is emitted on pages where it runs.

Likely false positives: The marker can be stripped by an HTML minifier or hidden via a filter, so this is a floor for Yoast and, in turn, for the WordPress sites that use it.

Stored source examples for Yoast SEO

These examples matched Yoast SEO plugin in stored homepage source when the query was sampled on 2026-10-14. The sites may have changed since the source was captured. A match establishes a source reference; it does not confirm an active installation or code execution.

• creativecommons.org ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v21.2 - https://yoast.com/wordpress/plugins/seo/...
• techcrunch.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.6) - https://yoast....
• foursquare.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https://yoast....
• searchengineland.com ...px 1500px }</style>\n\t\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v26.3 (Yoast SEO v26.3) - https://yoast....
• www.searchenginejournal.com ...m" crossorigin/>\n \n\t<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https://yoast....
• www.entrepreneur.com ...px 1500px }</style>\n\t\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https://yoast....
• woocommerce.com ...deo-preview:-1' />\n\r\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https://yoast....
• www.pcisecuritystandards.org ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v28.2) - https://yoast....
• sxsw.com ...gle Tag Manager -->\n\t\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v28.1 (Yoast SEO v28.1) - https://yoast....
• gamehistory.org ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.3 - https://yoast.com/product/yoast-seo-word...
• www.l214.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https://yoast....
• www.nielsen.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v28.2) - https://yoast....
• www.africatechsummit.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.3 - https://yoast.com/product/yoast-seo-word...
• gdpr.eu ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.3 - https://yoast.com/product/yoast-seo-word...
• matomo.org ...th, initial-scale=1">\n\t<!-- This site is optimized with the Yoast SEO plugin v28.4 - https://yoast.com/product/yoast-seo-word...
• diveintomark.org ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v26.8 - https://yoast.com/product/yoast-seo-word...
• civileats.com ...x-video-preview:-1' /> <!-- This site is optimized with the Yoast SEO Premium plugin v22.4 (Yoast SEO v22.4) - https://yoast....
• blogs.windows.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v27.4 - https://yoast.com/product/yoast-seo-word...
• www.vice.com ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https://yoast....
• gdpr-info.eu ...-- End Matomo -->\n\n\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.4 - https://yoast.com/product/yoast-seo-word...
• www.popsci.com ...) { }\n})();\n</script>\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https://yoast....
• www.zeldadungeon.net ...px 1500px }</style>\n\t\n\t<!-- This site is optimized with the Yoast SEO plugin v25.3 - https://yoast.com/wordpress/plugins/seo/...
• www.propublica.org ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https://yoast....
• unicornriot.ninja ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https://yoast.com/product/yoast-seo-wo...
• www.yubico.com ...t("woff2")}\n</style>\n\n\t<!-- This site is optimized with the Yoast SEO Premium plugin v22.8 (Yoast SEO v26.7) - https://yoast....
• eike-klima-energie.eu ...yParams,r]};</script>\n\t<!-- This site is optimized with the Yoast SEO plugin v27.3 - https://yoast.com/product/yoast-seo-word...
• deniseleeyohn.com ...- END OF OUTPUT -->\n\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.4 - https://yoast.com/product/yoast-seo-word...
• ritmeter.nl ...px 1500px }</style>\n\t\n\t<!-- This site is optimized with the Yoast SEO plugin v25.2 - https://yoast.com/wordpress/plugins/seo/...
• tourcataratas.com.br ...video-preview:-1' />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v28.4 - https://yoast.com/product/yoast-seo-word...
• www.foxandsheep.de ...foxandsheep.com/" />\n\n\t<!-- This site is optimized with the Yoast SEO plugin v22.7 - https://yoast.com/wordpress/plugins/seo/...

Showing 30 checked source examples. The headline is estimated matches. Open the full ranked list, inspect the matched source, and export the domain list →

Related technologies

How this works

The headline distinguishes candidate upper bounds (index prefilter), estimated matches (a projection from checked samples) and verified matches (an exact count established by the engine). The index contains 131,219,565 homepage documents, one homepage per hostname, including subdomains. The source index was promoted 2026-09-22 and follows a quarterly rebuild schedule. The sample date is when this query was checked against the stored index, not a new crawl of each example site.

Comparing adoption across tools? The Web Technology Adoption Report ranks the most common tags in the index side by side.