This bracket maker is designed for one clear format: single elimination, where one loss removes a participant from the tournament. Seed as entered when rankings matter, or use the shuffled draw for a casual event. The title, draw, and winner picks are saved in local browser storage. Nothing is uploaded, and clearing site data removes the saved tournament.
A field that is not a power of two needs byes in the first round. The tool expands the draw to the next size of 2, 4, 8, 16, or 32, then places empty slots against the highest seeds. Later rounds fill only when earlier matches are decided. If you change an earlier winner, every dependent result is cleared so the bracket cannot keep an impossible finalist.