Tournament Bracket Generator

How a single-elimination bracket works

A single-elimination (knockout) bracket is the fastest way to crown a winner: lose once and you are out. With N entrants there are exactly N−1 matches in total, because every match eliminates exactly one competitor and everyone except the champion gets eliminated once. That predictability is why knockouts run everything from cup football to tennis majors to the office table-tennis ladder: 16 players is always 15 matches across 4 rounds, whatever happens on the day. Rounds are named for how many are left standing — Round of 32, Round of 16, quarter-finals, semi-finals, final. With only 4 entrants, the first round already is the semi-finals.

Double elimination: everyone gets a second life

In a double-elimination bracket a single bad match doesn't end your day. Your first loss drops you out of the winners bracket and into the losers bracket, where you claw back match by match against everyone else who has lost once; a second loss eliminates you for real. The survivor of each side meets in the grand final — and because the champion must be beaten twice, the grand final is honest about it: if the losers-bracket champion wins game 1, the two play one deciding game (the famous "bracket reset"). Double elimination roughly doubles the match count — 2N−2 or 2N−1 games for N entrants — which is why it's beloved at smash tournaments, cornhole nights, billiards leagues and wrestling meets where nobody drove an hour to play once. This generator supports double elimination for up to 16 entrants (single elimination goes to 32), drops each winners-bracket loser into the correct losers-bracket round with the standard alternating placement so you don't get instant rematches, and plays the bracket reset properly.

Byes: padding the field to a power of two

Brackets only come in power-of-two sizes — 4, 8, 16 or 32 slots. If your entry count lands in between, the field is padded with byes: empty slots that concede their "match" automatically. Byes always go to the top seeds — the reward for seeding high is a first-round rest. The arithmetic is simple: next power of two minus entrants. 13 entrants play in a 16-slot bracket, so seeds 1, 2 and 3 each get a bye and skip straight to the second round. This generator places and resolves the byes the moment you build the bracket — in both formats.

Seeding: why 1 and 2 can only meet in the final

Seeds are placed with the standard interleaving used from Wimbledon to March Madness: seed 1 and seed 2 anchor opposite halves of the draw, seeds 3 and 4 take opposite quarters, and every first-round pairing sums to the bracket size plus one — 1 v 8, 4 v 5, 2 v 7, 3 v 6 in an eight-slot draw. The consequence: the two strongest entrants can only meet in the final, and higher seeds always open against the theoretically weakest opponents. Line 1 of your list is the top seed — keep the checkbox on to show seed numbers, hit Shuffle for a random draw, or reorder the lines by hand. Prefer everyone-plays-everyone instead? Use the round-robin fixture generator.

Tips for running the day

• Check-in before you build. Build the bracket from the players who actually showed up — a late scratch after round one means a walkover, not a rebuild.
• Assign courts or tables per match, top of the bracket first, and keep the next pairing warming up so no court sits idle.
• Announce loudly and twice — "Ada v Cem, table 2" — and click the winner the moment a match ends so the next round fills itself in front of everyone.
• Running double elimination? Keep the losers bracket moving between winners-bracket rounds — it has more matches, and it's where the queue forms.
• Put the bracket where people can see it: print a copy for the wall and send the share link to the group chat so nobody asks "who do I play next?"

Frequently asked questions

How many byes does my bracket need?

Subtract your entry count from the next power of two (4, 8, 16 or 32). For example, 13 entries play in a 16-slot bracket, so you need 3 byes — and they go to the top 3 seeds, who skip straight to the second round.

How are brackets seeded?

Standard placement puts seed 1 and seed 2 in opposite halves of the draw, so they can only meet in the final. Each first-round pairing sums to the bracket size plus one (1 v 8, 4 v 5, 2 v 7, 3 v 6 in an eight-slot bracket), which rewards higher seeds with the theoretically easiest early matches.

What is a double-elimination bracket?

Nobody is out after one loss: a first loss drops you into the losers bracket, a second eliminates you. The winners-bracket champion meets the losers-bracket champion in the grand final, and a losers-bracket win in game 1 forces one deciding game — the bracket reset. Switch the format toggle above to build one (up to 16 entrants).

Can I edit results after a match is played?

Yes. Click the other team to change a decided match — every later result that depended on the old winner is cleared automatically, so the bracket never contradicts itself. Click the current winner again to clear just that result.

Can I print the bracket?

Yes — use the Print bracket button. Only the bracket itself prints, on a clean white background, with the input form and page text hidden — in double elimination the winners bracket, losers bracket and grand final all print. Your bracket is also saved in your browser automatically, and Copy share link carries the whole bracket inside the URL.

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