generated: '2026-08-13'
method: searched
source: >-
  https://support.substack.com/hc/en-us/articles/360041759232-Can-I-embed-a-signup-form-for-my-Substack-publication,
  https://support.substack.com/hc/en-us/articles/25665267911572-How-do-I-embed-Substack-posts-or-notes-on-a-website
note: >-
  Substack ships no JavaScript component library and no npm element package. Its
  client-side surface is entirely iframe embeds generated inside the product — the code
  is copied out of the publication dashboard or a share menu, not imported from a
  package. There is no loader script, no configuration API and, per Substack's own
  documentation, no customization beyond a single logo toggle on the signup form.
families:
  - name: Subscription
    components:
      - name: Signup form embed
        type: iframe
        url_pattern: https://{publication}.substack.com/embed
        probe:
          url: https://on.substack.com/embed
          http_status: 200
          content_type: text/html
        obtained_from: Publication Settings > Growth features
        docs: https://support.substack.com/hc/en-us/articles/360041759232-Can-I-embed-a-signup-form-for-my-Substack-publication
        configuration:
          - option: Show pub logo on embed
            values: [on, off]
        customizable: false
        host_requirements: any platform supporting iframes (WordPress, Squarespace, custom sites); Medium not supported
        behaviour: >-
          After Subscribe, the reader is shown subscription plan options when payments
          are enabled, or Pledges options when Pledges are enabled, plus any
          recommended publications.
  - name: Content
    components:
      - name: Post embed
        type: iframe
        obtained_from: post Share menu > More > Embed
        docs: https://support.substack.com/hc/en-us/articles/25665267911572-How-do-I-embed-Substack-posts-or-notes-on-a-website
        customizable: false
      - name: Note embed
        type: iframe
        obtained_from: note share icon > Embed note
        docs: https://support.substack.com/hc/en-us/articles/25665267911572-How-do-I-embed-Substack-posts-or-notes-on-a-website
        customizable: false
  - name: Third-party content in Substack
    note: >-
      The inverse direction — embedding other services inside a Substack post — is
      documented per provider (video, audio, code blocks, Datawrapper charts,
      Polymarket odds). These are consumption surfaces inside the editor, not
      components Substack exposes to developers, and are listed only for completeness.
    docs:
      - https://support.substack.com/hc/en-us/articles/360037832971-How-do-I-embed-media-in-my-post-e-g-images-video-GIFs
      - https://support.substack.com/hc/en-us/articles/15722290158100-How-do-I-embed-Datawrapper-charts-in-a-Substack-post
loaders: []
packages: []
oembed:
  supported: false
  probe:
    url: https://substack.com/api/v1/oembed
    http_status: 404