Bingo cards that are all different
Classic 75-ball, plain numbers, or your own words and phrases. Every card is compared against the others, so no two in a set are the same.
Names and lists stay on this device
Why distinctness needs checking
Generating one card is easy. The requirement that matters is generating thirty and being able to say they are all different — because two identical cards in a room means two winners on the same call, which is the one outcome the game cannot survive.
For a classic 75-ball card the number of possible cards is astronomically large and a collision effectively never happens. For a word card built from a list barely longer than the grid, collisions are close to certain. So every card is fingerprinted and compared against the ones already made, and duplicates are discarded and redrawn.
If the list is too short to produce the number of distinct cards you asked for, the generator says so and gives you what it could rather than quietly repeating one.
Classic cards draw each column from its own range — B from 1 to 15, I from 16 to 30, and so on. Drawing from one pool would put 3 and 74 in the same column, and no caller's board would match it.
Word bingo
The most useful mode for a classroom or a long journey. Type a list — vocabulary, times tables, things to spot out of the window, names of people at a party — and every card gets a different arrangement of them.
A five-by-five card with a free space needs twenty-four entries. Supplying more than that is what makes the cards genuinely different rather than just shuffled: with exactly twenty-four, every card holds the same items in a different order, which is still playable but much less interesting.
The call sheet
Every set prints with a list of everything that appears on any card, so whoever is calling has the full pool in front of them. For classic cards that is all seventy-five numbers; for word cards it is your list, minus anything that did not make it onto a card.
Related
Word search generator and the maze generator for more printables.
Questions people actually ask
Are the cards guaranteed to be different?
Within a set, yes — each card is fingerprinted and compared against the ones already made, and duplicates are discarded and redrawn. It matters because two identical cards in a room means two winners on the same call.
How many words do I need?
A five-by-five card with a free space needs twenty-four. Supplying only twenty-four works but every card then holds the same items in a different order; thirty or forty gives genuinely varied cards. The generator tells you if your list is too short.
Why do classic cards use column ranges?
Because that is what makes them classic bingo cards: B holds 1 to 15, I holds 16 to 30, and so on. Drawing from one pool would put 3 and 74 in the same column, and no caller's board would match it.
Can I use these for a fundraiser or in class?
Yes. No account, no watermark, no limit, and nothing you type is uploaded — which matters if the list is people's names.
What is the call sheet for?
It lists everything appearing on any card, so whoever is calling has the full pool. It prints on its own page at the end.