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A chain runs a sequence of tools in order, feeding each one’s text output into the next one’s input. There are three places you’ll run into them:
  • The builder — drag tools into a sequence, reorder them, and run the whole thing. Works fully signed out; your in-progress chain is kept in your browser until you save it.
  • Editorial chain pages, like /chains/<slug>/ — a fixed, hand-built pipeline for a specific job, each with an “Open in the Chain builder” button to start editing your own copy.
  • A saved chain of your own, at /chain/<shareSlug>/ — a read-only view of one chain you’ve made public. See Sharing.
Building and running a chain needs no account. Only saving it to your list of chains does.

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Limits

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Not the only way to chain

Two lighter mechanisms cover the common cases without opening the full builder — each gets its own page:
  • Send output to… — from a single tool’s result, push its output straight into another tool.
  • Batch mode — run one tool over many files at once.
This page is about the website’s Chain builder. Calling several tools in sequence from your own code is a different, simpler thing — see Chaining tools under Examples.