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Documentation

  • Custom themes

    Learn how to create a custom theme for your blog.
  • API

    Invent new ways to use Tumblr.
  • Share buttons

    Give millions of bloggers a way to promote your content.
  • Tumblr in-app sharing

    Promote your app by letting your users post their stuff on Tumblr.
  • Embeddable posts

    Specs and how-to.

Discussion

  • Engineering blog

    Get firsthand updates from our front line.
  • API forum

    Tell us how you plan to use our API, get help with it, and more.
  • Theme developer forum

    Share feedback and get help from other developers.
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