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Two things on the site produce a link you can hand to someone else — both work without either side having an account. A tool’s ”⋮” menu has a Copy shareable link item. It compresses your current input values into the tool’s own URL and copies it — open that link and the tool fills in and runs automatically, landing straight on the result.
The state lives in the URL fragment (the part after #), which browsers never send to a server — so it never shows up in our logs, only in whoever’s clipboard you paste it into.
A few things never make it into the link, regardless of the tool: uploaded files, password-type fields, and any field a tool explicitly excludes from sharing. A link is capped at 1,800 characters’ worth of compressed state — past that, Copy shareable link tells you it’s too large instead of producing a broken link.

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Share a chain

A chain you’ve saved (see Chains) is private by default. Open “Your saved chains”, hit Share on the one you want, and flip Anyone with the link can view. That gives you a link at /chain/<shareSlug>/ — read-only, showing the chain’s steps and an “open a copy in your own builder” option, but not editable by whoever you send it to. Turn the toggle back off and the link stops working immediately. The One-Time Link tool is its own catalog tool rather than a site-wide feature, but it’s worth knowing about here: it encrypts a secret entirely in your browser and gives you a link that can only be opened once before it’s destroyed — useful for handing off a password or API key somewhere less private than these two mechanisms.