0 people. Blank lines are ignored.
How to split into teams of even size
Put one name per line, choose Number of teams or People per team, and press Make teams. The list is shuffled first and then cut into teams in order, so who ends up with whom depends only on the shuffle. Pasting the names alphabetically, or in the order people arrived, makes no difference to the result.
Even here means the team sizes never differ by more than one. Eleven people in three teams come out as 4, 4 and 3, because eleven does not divide by three and the odd person has to go somewhere. Twelve would be three teams of four. The larger teams are listed first, but which people land in them is down to the shuffle, so being in a team of four rather than three is as random as the rest.
Teams of a fixed size, and the people left over
Teams of four from ten people has two possible answers: two teams of four plus a team of two, or three teams of 4, 3 and 3. This page gives the second. It works out how many teams are needed so that nobody is over the size you asked for, which is ten divided by four rounded up, three, and then spreads people across them evenly. A pair standing next to two groups of four is rarely what anyone wants for a game, and 4, 3, 3 keeps the gap at one.
The line under the settings shows the sizes before you press the button. If the request cannot work, such as five teams from four people, or teams of six when there are only six people and so only one team, the page says so instead of producing an empty team or leaving everyone together.
Using a random team generator for classes and games
Each press of Make new teams is a fresh shuffle of the whole list, not a tweak of the last result, so pressing it again can move everyone. A random split balances numbers, not ability. If skill matters, put the strongest players on a list of their own and split them into the same number of teams, then do the same with everyone else and join the teams up in pairs.
Copy puts each team on its own line, as Team 1 followed by the names separated by commas, which pastes cleanly into a group chat or a class document.
Where the randomness comes from
This tool runs entirely in your browser, using its built in cryptographic random number generator. Nothing you type is sent to us, nothing is stored, and each result is thrown away the moment you leave the page. Numbers are drawn without the rounding bias that the usual shortcut introduces, so every outcome is as likely as every other.
Because nothing is recorded, a result here proves nothing to anyone afterwards. If you need a drawing that other people have to accept, for a prize, a campaign or an audit, use Winner Picker, which publishes each result on a permanent link with a signed record anyone can check.