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The slug is the part of a Link’s address that identifies it: the bepjov in qrtub.com/bepjov, the exc203 in qrtub.com/exc203. Everything else in the URL is fixed. When QRtub asks how you want a Link created, it is really asking how you want its slug chosen.

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One address shape, whichever type you pick

All three sit at the root. There is no prefix on any of them, so an address is always the domain and the slug — nothing to remember, nothing to leave off when you write one down. The domain is always lowercase qrtub.com. When you print a Link as readable text under a QR code, print the whole address rather than the slug alone — qrtub.com/bepjov, not bepjov.

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Case never matters

qrtub.com/BEPJOV, qrtub.com/bepjov and qrtub.com/BepJov all resolve to the same Link. That is true of all three types. So how a code is printed is a typography decision rather than a correctness one. Capitals often read better on a plate at distance; lowercase reads better in a line of body text. Pick whichever suits the tag — and if crews type addresses by hand on a muddy site with a cracked screen, nobody gets caught out by a capital. QRtub displays addresses in lowercase in the app and in exports, except for numbered slugs, which keep whatever case you claimed the pattern in — so a pattern claimed as CRA#### prints as CRA0042TL.

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Slugs are unique across all of QRtub, not just your team

Slugs are checked against every Link in QRtub, not just your team’s. If another team already holds boardroom, you cannot have it, and QRtub tells you it is in use rather than quietly giving you something else. The check ignores case, so Boardroom is not available either. Random slugs mostly sit outside that contest. They are letters only and numbered slugs always contain digits, so those two shapes cannot meet, and a random name is derived through a cipher rather than drawn and checked, so two random Links can never land on the same slug. A custom slug can take a random-looking name — bepjov is legal — and if one has, QRtub simply mints a different random name instead. That happens silently; there is nothing to resolve. A slug is fixed once the Link exists. There is no rename: the point of the whole system is that a printed code keeps resolving, and renaming a slug would break every code already in the field. If you need a different address, create a new Link and, if the old one is no longer wanted, delete it.

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What varies by type

Each type has its own rules about what characters a slug may contain and how long it can be — a random slug is always six lowercase letters, a custom slug is validated against a fixed charset and a reserved-word list, and a numbered slug is built from a prefix, a zero-padded number and a suffix. Those rules live with each type rather than here.