Unlike soccer which is played on a grass or turf field, futsal is played indoors. In addition, the pitch is not made of grass, but instead is a hard surface. The pitch is still constrained by lines, however, just like in an outdoor soccer field.
Soccer fields are known to be 75 yards by 120 yards. However, in futsal, the court is way smaller. Usually, in a standard futsal match, the court is 42 meters by 25 meters. As a result, the pace of play in a futsal match is much faster because there is less space from end line to end line.
In a soccer match, the size of the ball is a standard size 5 ball. In addition, the ball in soccer is made to bounce on surfaces. However, a futsal ball is a smaller ball, size 4, and is more dense. Therefore, the ball does not bounce on the futsal court.
Unlike soccer, a single futsal game has unlimited substitutions. While in soccer there is a limit of 3-5 subs depending on the league, in futsal there are no limits. Players can be subbed on and off, so long as they do so from the designated substitution zone and do not exceed 5 players on the court including the goalkeeper limit.
Because there is a smaller pitch, the number of players from each team during a game is much smaller. Instead of your typical 11 v 11 soccer match, futsal only includes 5 players on each side, including the goalkeeper.
The halves in a typical soccer match are 45 minutes each, with stoppage time included at the end. However, in a futsal match, the halves are half the amount. Each half in a futsal game is 20 minutes long. In addition, the clock stops whenever the ball is out of play, which means that there is no stoppage time included at the conclusion of the match.
Usually in a typical soccer match, when the ball goes out of play, the team in possession gets to throw-in the ball. However, in futsal, there are no throw ins. Instead, players kick-in the ball. This makes the pace of play much faster than your average soccer match.
In soccer, offsides is a standard rule that helps the defending team defend their goal from attackers. However, because the pitch in futsal is so small, there is no offsides rule. As a result, attackers in futsal can get as close to the goal as they would like, and often results in more goal scoring opportunities than are typically seen in soccer.
In futsal, players can not take their time when putting the ball back into play. Instead, they have a limited amount of time before they are called out. In a typical futsal match, players have four seconds to get rid of the ball and put it into play. This is not something seen in soccer, and helps keep the pace of the game quicker.