Offside is the rule that causes the most arguments in football, and most of that confusion comes from a few common misunderstandings rather than the law itself. This guide explains offside in plain language, using the situations you actually see in matches. It also covers the edge cases that VAR has made more visible.
A player is in an offside position if any part of their head, body or feet is in the opponents’ half and is nearer to the opponents’ goal line than both the ball and the second-last opponent. The goalkeeper usually counts as one of those two opponents.
Being in an offside position is not an offence by itself. Most fans forget this. A player is only penalised if they become involved in active play at the moment a teammate plays or touches the ball.
Offside is judged at the moment a teammate plays or touches the ball. Where the attacker ends up when they receive it doesn’t matter. A forward who starts level and sprints three metres clear of the defence was onside if they were level when the pass left their teammate’s foot. Assistant referees train to watch two things at once for exactly this reason: the passer’s foot and the defensive line.
The Laws of the Game list three ways a player in an offside position becomes guilty of an offence:
That third point catches people out. A shot that the goalkeeper saves and parries to a striker who was offside when the shot was taken is still offside. The save doesn’t “reset” anything.
Things change when a defender deliberately plays the ball, as opposed to a deflection or a save. The attacker who was in an offside position is then usually not penalised for receiving it. A classic example: a defender tries to clear a long ball, miscontrols it, and it drops to a striker who was standing offside. Because the defender chose to play the ball, the striker’s earlier position is forgiven.
Officials weigh how much control the defender had. A defender stretching desperately to block a pass from a metre away is not treated the same way as one with time and space to control it. This judgement is behind many debated decisions.
There is no offside offence if a player receives the ball directly from:
It does apply from free kicks. Attackers standing in an offside position at a free kick will be penalised if they become involved once the ball is played.
The defending team is awarded an indirect free kick where the offence occurred. That includes cases where the player was in their own half when they became involved, because they had run back from an offside position.
Before VAR, assistant referees were told to give the benefit of the doubt to the attacker. Video review changed what “level” looks like. Lines are drawn on a single frame of broadcast footage, so the judgement depends on which frame is chosen as the moment of the pass. At normal match speed, players can move several centimetres between frames.
That is why several competitions have moved to semi-automated offside technology. It uses dedicated tracking cameras and, in some tournaments, a sensor in the ball to identify the kick point more precisely. It doesn’t change the law. It just measures it more consistently. Fans still argue because a toe or a shoulder can now decide a goal that the human eye would never have seen.
Next time you watch a match, try this: when a team builds an attack, pick out the deepest defender (not counting the goalkeeper) and watch that line instead of the ball. As the pass is played, glance at the attacker. You will start to see why forwards curve their runs along the line, and why defenders step up together at the last second to set an offside trap.