Structured data appeared on 50% of desktop home pages and 50% of mobile home pages in the 2025 Web Almanac crawl. The 2024 crawl recorded structured data on 48% of desktop home pages and 49% of mobile home pages. These measurements describe adoption in the crawled pages, not every website on the internet.
Contents
- Overall adoption
- Format adoption by page and device
- JSON-LD schema types
- Home page schema types
- Inner page schema types
- Raw HTML, rendering, and JavaScript
Overall website structured data adoption
The broadest adoption figures come from the SEO chapters of the Web Almanac by HTTP Archive. In the 2025 crawl, structured data appeared on half of both desktop and mobile home pages. That is a 50% share for each device category in the reported crawl. Source: SEO | 2025 | The Web Almanac by HTTP Archive.
The preceding 2024 crawl reported a slightly lower desktop home-page share and a nearly identical mobile share. Structured data appeared on 48% of desktop home pages and 49% of mobile home pages. The source labels these as 2024 crawl measurements, so they should be read as a snapshot for that period rather than as a current universal rate. Source: SEO | 2024 | The Web Almanac by HTTP Archive.
Earlier figures from the 2022 Web Almanac crawl covered pages rather than the later home-page wording. Structured data appeared on 44% of desktop pages and 45% of mobile pages. Because the page definitions differ from the 2024 and 2025 home-page figures, these values are useful historical context but are not a like-for-like time series. Source: SEO | 2022 | The Web Almanac by HTTP Archive.
The 2024 crawl also separated inner pages. Some structured data markup appeared on 51% of desktop inner pages and 53% of mobile inner pages. Those shares are higher than the 48% desktop and 49% mobile home-page figures reported in the same crawl, although the categories represent different page groups. Source: SEO | 2024 | The Web Almanac by HTTP Archive.
| Crawl measurement | Desktop | Mobile |
|---|---|---|
| 2025 home pages with structured data | 50% | 50% |
| 2024 home pages with structured data | 48% | 49% |
| 2022 pages with structured data | 44% | 45% |
| 2024 inner pages with some structured data | 51% | 53% |
The comparison shows why page type and measurement year matter. A percentage for all pages, home pages, and inner pages cannot automatically be treated as the same population. The figures nevertheless establish a clear scale: structured data was present on roughly half of the measured pages in the cited crawls.
Structured data formats by page type and device
JSON-LD was the most frequently reported format in the 2025 home-page measurements. It was used on 43% of desktop home pages and 43% of mobile home pages. Microdata was used on 17% of desktop home pages and 16% of mobile home pages. Source: SEO | 2025 | The Web Almanac by HTTP Archive.
The same 2025 crawl reported JSON-LD on 39% of desktop inner pages and 37% of mobile inner pages. Microdata appeared on 19% of both desktop and mobile inner pages. These measurements put JSON-LD ahead of Microdata on every listed page-and-device combination, while Microdata was more common on inner pages than on home pages in the reported percentages.
The 2024 format measurements include a third format, RDFa. On desktop home pages, JSON-LD was used on 40.5%, Microdata on 17.4%, and RDFa on 0.9%. On mobile home pages, the corresponding figures were 40.4%, 18.8%, and 0.8%.
| 2024 page group and format | JSON-LD | Microdata | RDFa |
|---|---|---|---|
| Desktop home pages | 40.5% | 17.4% | 0.9% |
| Mobile home pages | 40.4% | 18.8% | 0.8% |
| Desktop inner pages | 36.6% | 20.1% | 2.0% |
| Mobile inner pages | 35% | 20.2% | 1.8% |
For 2024 inner pages, JSON-LD was used on 36.6% of desktop pages and 35% of mobile pages. Microdata was used on 20.1% of desktop pages and 20.2% of mobile pages. RDFa was used on 2.0% of desktop pages and 1.8% of mobile pages. Source: SEO | 2024 | The Web Almanac by HTTP Archive.
The device differences in these format measurements were modest. In 2024, desktop home pages had JSON-LD at 40.5% versus 40.4% on mobile, while mobile home pages had Microdata at 18.8% versus 17.4% on desktop. On inner pages, the reported JSON-LD share was 1.6 percentage points higher on desktop, and the Microdata shares differed by 0.1 percentage point.
JSON-LD schema type adoption
The 2024 structured-data chapter provides type-level measurements for JSON-LD. In that dataset, WebSite appeared on 12.73% of mobile pages, Organization on 7.16%, LocalBusiness on 3.97%, and BreadcrumbList on 5.66% of pages. The source reports these type shares within its structured-data dataset, so they should not be read as percentages of all websites. Source: Structured data | 2024 | The Web Almanac by HTTP Archive.
Other reported JSON-LD types had smaller shares. ItemList appeared on 2.44% of pages, WebPage on 1.49%, BlogPosting on 1.40%, AutoDealer on 1.09%, and Product on 0.77%.
Several types appeared at approximately or below half of one percent in the same 2024 dataset. VideoObject appeared on approximately 0.34% of pages, FAQPage on approximately 0.34%, and Event on approximately 0.34%. Article appeared on 0.18%, while Restaurant appeared on 0.19%.
| JSON-LD type | Reported share |
|---|---|
| WebSite, mobile pages | 12.73% |
| Organization, mobile pages | 7.16% |
| BreadcrumbList | 5.66% |
| LocalBusiness, mobile pages | 3.97% |
| ItemList | 2.44% |
| WebPage | 1.49% |
| BlogPosting | 1.40% |
| AutoDealer | 1.09% |
| Product | 0.77% |
| VideoObject, approximately | 0.34% |
| FAQPage, approximately | 0.34% |
| Event, approximately | 0.34% |
| Restaurant | 0.19% |
| Article | 0.18% |
The type list is not a ranking of search performance. It is a record of how often each named JSON-LD type appeared in the cited 2024 structured-data measurement. Multiple types can appear on one page, so the listed percentages should not be added together.
Home page schema type adoption
The 2025 SEO crawl gives a more specific view of schema types on home pages. The schema.org/WebSite type appeared on 37% of desktop home pages and 36% of mobile home pages. The schema.org/SearchAction type appeared on 28% of both desktop and mobile home pages. Source: SEO | 2025 | The Web Almanac by HTTP Archive.
The desktop home-page measurements also reported Organization at 26.74% and WebPage at 25%. On mobile home pages, BreadcrumbList appeared on 20% and ImageObject appeared on 21%. These values describe the specific device and page categories named by the source; the supplied measurements do not provide every type for both devices.
| Home-page schema type | Desktop | Mobile |
|---|---|---|
| WebSite | 37% | 36% |
| SearchAction | 28% | 28% |
| Organization | 26.74% | Not reported here |
| WebPage | 25% | Not reported here |
| BreadcrumbList | Not reported here | 20% |
| ImageObject | Not reported here | 21% |
WebSite therefore had the highest listed home-page share in the 2025 measurements, followed by SearchAction, Organization, WebPage, ImageObject, and BreadcrumbList where reported. This ordering is limited to the supplied home-page observations and should not be generalized to unlisted schema types.
Inner page schema type adoption
Inner pages show a different mix. In the 2025 crawl, ListItem appeared on 29% of desktop inner pages and 27% of mobile inner pages. BreadcrumbList appeared on 28% of desktop inner pages and 27% of mobile inner pages. Source: SEO | 2025 | The Web Almanac by HTTP Archive.
The schema.org/WebSite type appeared on 25% of mobile inner pages, while Organization appeared on 26% of desktop inner pages. The source also reported Product structured data on 4% of mobile inner pages in the 2024 crawl. These numbers use different crawl years, so the 4% Product figure should not be compared as a year-over-year change against the 2025 type figures.
| Inner-page schema type or markup | Desktop | Mobile |
|---|---|---|
| ListItem, 2025 | 29% | 27% |
| BreadcrumbList, 2025 | 28% | 27% |
| WebSite, 2025 | Not reported here | 25% |
| Organization, 2025 | 26% | Not reported here |
| Product structured data, 2024 | Not reported here | 4% |
The near-matching ListItem and BreadcrumbList shares are notable within the reported inner-page data: both were 27% on mobile, while desktop ListItem was 1 percentage point above desktop BreadcrumbList. The dataset does not establish why those differences occurred.
Raw HTML, rendering, and JavaScript implementation
The 2024 SEO crawl compared structured data found in raw HTML with structured data present after rendering. Raw structured data appeared on 47% of desktop home pages and 48% of mobile home pages. After rendering, structured data appeared on 48% of desktop home pages and 49% of mobile home pages. Source: SEO | 2024 | The Web Almanac by HTTP Archive.
Only 2% of desktop home pages and 2% of mobile home pages gained structured data only after rendering. Rendering altered or augmented structured data on 6% of desktop home pages and 5% of mobile home pages.
| 2024 home-page rendering measure | Desktop | Mobile |
|---|---|---|
| Raw structured data | 47% | 48% |
| Rendered structured data | 48% | 49% |
| Gained structured data only after rendering | 2% | 2% |
| Rendering altered or augmented structured data | 6% | 5% |
These figures distinguish presence before and after rendering. The one-percentage-point difference between the raw and rendered shares does not mean that every additional rendered page had no other change: the crawl separately reports pages where rendering altered or augmented existing structured data. The measured post-render view is therefore a distinct implementation snapshot, not a claim about how search engines will interpret every site.
Across the cited measurements, the practical adoption pattern is consistent in one respect: about half of measured pages contained structured data, JSON-LD was more prevalent than Microdata in the listed format comparisons, and schema-type shares varied substantially by page type. The exact percentages remain tied to the Web Almanac crawl year, device category, page category, and source definition shown above.