Jekyll: vendor profile

In short

Every .md source page becomes .html in _site, so no markdown copy exists at any URL unless it is copied by hand. Outside GitHub Pages and WEBrick, the 404.html needs server configuration before it carries a 404 status. jekyllrb.com returned 404 for /llms.txt and for a made-up path on 2026-11-05. Jekyll is free under the MIT licence.

At a glance

standards.txt jekyll

llms-txt               = no statement
markdown-negotiation   = no statement
markdown-twin          = no statement
initial-html           = supports
real-404               = partial
vary-accept            = no statement

1 supports, 1 partial or announced, 4 no statement.

Jekyll Framework

Jekyll is a Ruby static site generator and the engine behind GitHub Pages. It turns Markdown and Liquid templates into plain HTML files; sitemaps and JSON-LD come from the jekyll-sitemap and jekyll-seo-tag plugins.

Type: Framework
Home page: jekyllrb.com, answered HTTP 200 on 2026-11-05
Last read: 5 November 2026

What it does for this layer

The Jekyll docs describe it as a static site generator that turns text in a markup language plus layouts into a static website. [primary source] source, read 5 November 2026.
The Jekyll README says it renders Markdown and Liquid into a complete static site for Apache, Nginx or another server, and that Jekyll is the engine behind GitHub Pages. [primary source] source, read 5 November 2026.
Jekyll's quickstart installs the jekyll and bundler gems, scaffolds a site with `jekyll new myblog` and needs Ruby 2.7.0 or higher. [primary source] source, read 5 November 2026.
Jekyll 4.4.1, a patch restoring globbed path matching in front matter defaults, was announced on jekyllrb.com on 29 January 2025. [primary source, 2025-01-29] source, read 5 November 2026.
On 2026-11-05 the newest entry in the jekyllrb.com news list was still the Jekyll 4.4.1 release, and the site header showed v4.4.1. [primary source] source, read 5 November 2026.
Jekyll's custom 404 tutorial says a 404.html at the root of _site is served automatically by GitHub Pages and by the local WEBrick server. [primary source] source, read 5 November 2026.
For Apache and Nginx hosts, the Jekyll 404 tutorial adds ErrorDocument 404 /404.html to .htaccess or an error_page 404 rule in the nginx server block. [primary source] source, read 5 November 2026.
Minima is the theme `jekyll new` installs, and its README says it comes with the jekyll-seo-tag plugin preinstalled. [primary source] source, read 5 November 2026.
The jekyll-seo-tag plugin adds title, description, canonical URL, Open Graph and Twitter tags, plus JSON-LD site and post metadata. [primary source] source, read 5 November 2026.
The jekyll-sitemap plugin writes a sitemaps.org sitemap once it is listed under plugins in _config.yml; the GitHub Pages gem ignores it if it appears only in the Gemfile. [primary source] source, read 5 November 2026.
Setting safe: true in a Jekyll _config.yml turns off all plugins, so jekyll-sitemap writes no sitemap.xml in that mode. [primary source] source, read 5 November 2026.
jekyllrb.com says Jekyll is maintained by a core team of volunteers, and the jekyll/jekyll repository is MIT licensed. [primary source] source, read 5 November 2026.
On 2026-11-05 jekyllrb.com returned 404 for /llms.txt and for a made-up path, and answered Accept: text/markdown on the home page with text/html. [observed, 2026-11-05] source, read 5 November 2026.

Products and plans

Plans and prices as the vendor's own pages showed them on the date read.
Product	What it is	Price	As of	Source
Jekyll	Open source Ruby static site generator that turns Markdown and Liquid templates into static HTML; it powers GitHub Pages.	Free, open source MIT license	2026-11-05	source

Standards

The six standards this site tracks; no statement means the pages read said nothing.
Standard	Status	What the vendor's pages say	Source
llms-txt	no statement	No statement found in the Jekyll docs, plugins page, news list or the jekyll-seo-tag and jekyll-sitemap READMEs, and the jekyllrb.com site has no llms.txt of its own.	none
markdown-negotiation	no statement	No statement found in the Jekyll quickstart or custom 404 tutorial; Jekyll writes static files to _site and the web server decides content types.	none
markdown-twin	no statement	No statement found in the Jekyll quickstart or plugin READMEs; Markdown sources are converted to .html files in _site.	none
initial-html	supports	The Jekyll quickstart calls it a static site generator that uses layouts to create a static website, so pages ship as complete HTML.	source
real-404	partial	404.html is served automatically by GitHub Pages and WEBrick; Apache and Nginx need ErrorDocument or error_page rules per the tutorial.	source
vary-accept	no statement	No statement found in the Jekyll quickstart, 404 tutorial or plugin READMEs about Vary or content negotiation.	none

Checks on its own site

Readings of jekyllrb.com, the vendor's own website, which describe that site and not the product.
Reading	Result	Date
Home page request	HTTP 200; H1 in the initial HTML: yes; 152 words; 1 JSON-LD block	2026-11-05
Request with Accept: text/markdown	HTTP 200, text/html, Vary: Accept-Encoding	2026-11-05
/llms.txt at the host root	HTTP 404, text/html, 5.3 KB	2026-11-05
A made-up path	HTTP 404	2026-11-05
Ora score, cached	Not available: GET /api/score returned 404 DOMAIN_NOT_SCANNED	2026-11-05
Cloudflare keyless scan	7, L0 Not Ready	2026-11-05

What it does not do

Jekyll keeps no markdown copy in _site, since every .md source page is converted to an .html file, so a page's markdown is not reachable at a URL unless you copy it as a static file.
Jekyll core writes no sitemap.xml or JSON-LD; both come from the jekyll-sitemap and jekyll-seo-tag plugins, which stop working under safe: true.

Related pages on this site

Sources

Jekyll • Simple, blog-aware, static sites | Transform your plain text into static websites and blogs https://jekyllrb.com/, read 5 November 2026
Quickstart | Jekyll • Simple, blog-aware, static sites https://jekyllrb.com/docs/, read 5 November 2026
GitHub - jekyll/jekyll https://github.com/jekyll/jekyll, read 5 November 2026
Jekyll 4.4.1 Released | Jekyll • Simple, blog-aware, static sites https://jekyllrb.com/news/2025/01/29/jekyll-4-4-1-released/, read 5 November 2026
News | Jekyll • Simple, blog-aware, static sites https://jekyllrb.com/news/, read 5 November 2026
Custom 404 Page | Jekyll • Simple, blog-aware, static sites https://jekyllrb.com/tutorials/custom-404-page/, read 5 November 2026
GitHub - jekyll/minima: Minima is a one-size-fits-all Jekyll theme for writers. · GitHub https://github.com/jekyll/minima, read 5 November 2026
GitHub - jekyll/jekyll-seo-tag: A Jekyll plugin to add metadata tags for search engines and social networks to better index and display your site's content. · GitHub https://github.com/jekyll/jekyll-seo-tag, read 5 November 2026
GitHub - jekyll/jekyll-sitemap: Jekyll plugin to silently generate a sitemaps.org compliant sitemap for your Jekyll site · GitHub https://github.com/jekyll/jekyll-sitemap, read 5 November 2026

Last reviewed 5 November 2026