GitHub Pages: vendor profile

In short

GitHub Pages runs no server code and sets no custom response headers, so markdown by Accept header needs a CDN in front, and a client-rendered app reaches agents as its empty shell. A 404.html or 404.md in the repository becomes the not-found page. Pages is free with GitHub Free for public repositories; private ones need a paid plan.

At a glance

standards.txt github-pages

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

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

GitHub Pages Host, CDN or edge product

Static hosting from a GitHub repository with an optional Jekyll build; a 404.html or 404.md in the repository becomes the custom not-found page, and server headers cannot be set.

Type: Host, CDN or edge product
Operator, as the facts below state it: GitHub
Home page: pages.github.com, answered HTTP 200 on 2026-11-05
Last read: 5 November 2026

What it does for this layer

GitHub describes Pages as a static site hosting service that takes HTML, CSS and JavaScript files from a repository, optionally runs a build process and publishes a website. [primary source] source, read 5 November 2026.
GitHub Pages is available in public repositories on GitHub Free, and in public and private repositories on GitHub Pro, Team, Enterprise Cloud and Enterprise Server. [primary source] source, read 5 November 2026.
A custom not-found page on GitHub Pages is a file named 404.html or 404.md in the publishing source. [primary source] source, read 5 November 2026.
Jekyll is the static site generator with built-in support on GitHub Pages; it builds Markdown and HTML into a site using layouts and Liquid templates. [primary source] source, read 5 November 2026.
GitHub Pages runs a set of Jekyll plugins that are on by default and cannot be disabled, including jekyll-titles-from-headings, jekyll-relative-links and jekyll-readme-index. [primary source] source, read 5 November 2026.
Published GitHub Pages sites may be no larger than 1 GB, deployments time out after 10 minutes, and sites have a soft bandwidth limit of 100 GB a month. [primary source] source, read 5 November 2026.
GitHub Pages answers rate-limited requests with HTTP 429 and an informative HTML body. [primary source] source, read 5 November 2026.
GitHub's terms on the limits page say Pages is not meant to run an online business, an e-commerce site or commercial software as a service. [primary source] 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
GitHub Pages	Static site hosting from a repository, with a built-in Jekyll build or a custom GitHub Actions workflow.	Free Included with GitHub Free for public repositories; private repositories need a paid GitHub plan	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	GitHub Pages serves an llms.txt only if the repository contains one; no generator in the pages read.	none
markdown-negotiation	no statement	No Accept-header handling in the pages read; Pages offers no custom response headers.	none
markdown-twin	no statement	No markdown copy feature in the pages read.	none
initial-html	partial	Pages serves the static files in the repository or the Jekyll build, so content is in the HTML when the source is static.	source
real-404	supports	A 404.html or 404.md in the source becomes the custom not-found page.	source
vary-accept	no statement	Not covered in the pages read.	none

Checks on its own site

Readings of pages.github.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; 688 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, 9.2 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

GitHub Pages offers no way to set custom response headers or rewrite by Accept header in the pages read, so markdown negotiation needs a CDN in front.
GitHub Pages runs no server code, so a site built as a client-rendered app reaches agents as its empty shell.

Related pages on this site

Sources

GitHub Pages: home page https://pages.github.com/, read 5 November 2026
What is GitHub Pages? - GitHub Docs https://docs.github.com/en/pages/getting-started-with-github-pages/what-is-github-pages, read 5 November 2026
Creating a custom 404 page for your GitHub Pages site - GitHub Docs https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site, read 5 November 2026
About GitHub Pages and Jekyll - GitHub Docs https://docs.github.com/en/pages/setting-up-a-github-pages-site-with-jekyll/about-github-pages-and-jekyll, read 5 November 2026
GitHub Pages limits - GitHub Docs https://docs.github.com/en/pages/getting-started-with-github-pages/github-pages-limits, read 5 November 2026

Last reviewed 5 November 2026