What is onside and offside in football? A player is onside when their position does not meet the offside conditions; they are offside only if they are in an offside position and then become involved in play. The key moment is when a teammate plays or touches the ball, not when the receiver gets it.
This guide explains how to judge a player’s position, what counts as involvement, and which restarts are exempt. It also clears up common misunderstandings about defenders, rebounds, and being level with an opponent. Once you know the timing and the two-part test, the rule becomes much easier to follow.
what is onside and offside in football?
In association football, onside describes a player who is not in an offside position when a teammate plays the ball, or who is in an offside position but does not commit an offside offense. It is the normal, legal position for receiving a pass. Offside is not called simply because a player stands near the opposing goal. The player must meet the position test at the right moment and then take an active part in play.
The rule limits attackers from gaining an unfair advantage by waiting close to the opponent’s goal for a pass. At the same time, it allows forward passes when attackers time their runs properly or stay level with the required defenders. The assistant referee’s flag may help the referee judge the moment, but the decision depends on the player’s position and actions.
Use this simple two-part test: first, was the player in an offside position when a teammate played or touched the ball? Second, did that player become involved in active play? If the answer to either part is no, there is no offside offense.
How to tell if a player is in an offside position
A player is in an offside position when, at the moment a teammate plays or touches the ball, all of these conditions apply:
- The player is in the opponents’ half of the field. The halfway line itself does not count as the opponents’ half.
- Some part of the player’s head, body, or feet is nearer to the opponents’ goal line than both the ball and the second-last opponent.
Being nearer to the goal line means being farther forward toward the goal. The comparison is made against the second-last opponent, not necessarily the goalkeeper. The goalkeeper is often the last opponent, but another defender may be behind them, or the goalkeeper may have moved upfield. The referee considers the two opponents nearest to their own goal line when judging the position.
The arms and hands do not count when judging offside position. This applies even if a player’s hand or arm is ahead of the defender. The boundary for the upper body is the bottom of the armpit; body parts that can legally play the ball are relevant to the position decision.
If the attacker is level with the second-last opponent, the attacker is onside. The attacker is also onside if level with the ball. A player can therefore stand in front of the second-last opponent and still be onside when the ball is even farther forward.
Position is judged at the instant the teammate plays or touches the ball. The attacker’s position when the ball arrives does not decide the call. A player who starts a run from an onside position can sprint beyond defenders to meet the pass. Conversely, a player who is offside when the pass is made cannot avoid the offense by moving back onside before receiving it, if they then become involved.
When an offside position becomes an offense
Simply standing in an offside position is not an offense. The player must become involved in active play. The Laws of the Game group this involvement into three main types:
1. Interfering with play
A player interferes with play by playing or touching a ball passed or touched by a teammate. This is the most straightforward case: an attacker is in an offside position at the pass, then controls, redirects, or otherwise touches the ball.
The player does not need to score or keep possession for an offense to occur. Touching the ball is enough when the other conditions are met. If an offside-positioned attacker lets the pass run through without touching it, that alone does not make them guilty of interfering with play.
2. Interfering with an opponent
An offside-positioned player may commit an offense without touching the ball if their actions affect an opponent’s ability to play it. Examples include clearly obstructing an opponent’s line of vision or challenging an opponent for the ball. A player can also be penalized for an obvious action that clearly affects an opponent’s ability to play the ball.
Merely being near a defender is not automatically an offense. The question is whether the player’s presence or action actually interferes with the opponent. For example, a player standing in front of the goalkeeper may be penalized if they block the goalkeeper’s view of a shot, but not just because they happen to be in the area.
3. Gaining an advantage from a rebound or deflection
An attacker in an offside position can be penalized for playing the ball after it rebounds or deflects to them from an opponent, or after it comes back from the goal frame. The rule also covers playing a ball deliberately saved by an opponent. A save means an attempt to stop or deflect a ball that is going into or very close to the goal.
A rebound does not automatically reset offside. If the attacker was offside when a teammate last played the ball and then collects a rebound, the referee may call the offense. The details of what the opponent did before the rebound matter, as explained below.
How a defender’s touch affects the offside decision
A common misunderstanding is that any touch by a defender resets offside. It does not. The important distinction is between a defender’s deliberate play of the ball and a deflection or deliberate save.
If a defender deliberately plays the ball and an attacker who was in an offside position receives it, that attacker is generally not penalized for offside. For example, a defender who has time to control or pass the ball but misplays it may make the attacker onside for that phase of play. The attacker’s position is assessed in relation to the teammate’s earlier play, but the defender’s deliberate action changes the situation under the rule.
A touch that is only a deflection does not have the same effect. If a defender is struck by the ball or makes an instinctive reaction without deliberately playing it, an attacker who was already offside can still be penalized for becoming involved. A deliberate save also does not reset offside.
In practice, the referee considers whether the defender had a chance to control the ball and what the defender did. A rushed, poorly executed attempt can still be deliberate play; a ball that merely ricochets off a defender is not. Do not assume that a defender’s contact makes every attacker onside.
When offside does not apply
A player cannot be penalized for an offside offense when receiving the ball directly from certain restarts. The exceptions are:
- A goal kick
- A throw-in
- A corner kick
For example, an attacker can receive a corner directly while standing close to the goal without committing an offside offense. If another teammate touches the ball after the corner, the usual offside rules apply at that teammate’s touch.
Offside also cannot apply to a player who is in their own half when the teammate plays the ball. A player may run into the opponents’ half to receive the pass without being offside if they were still in their own half at the key moment. Remember that the halfway line belongs to neither side for this position test: a player level with it is not in the opponents’ half.
Finally, a player in an offside position is not penalized if they do not become involved in active play. They may be allowed to remain in that position while a teammate plays the ball elsewhere, provided they do not interfere with an opponent or gain an advantage from a later rebound or save.
Quick examples: onside or offside?
| Situation | Decision | Why |
|---|---|---|
| An attacker is level with the second-last opponent when a teammate passes. | Onside | Being level is not an offside position. |
| An attacker is beyond the second-last opponent, in the opponents’ half, and controls a teammate’s pass. | Offside | The player was in an offside position and interfered with play. |
| An attacker is ahead of the defenders but behind the ball when a teammate passes forward. | Onside | The player is not nearer to the goal line than the ball. |
| An attacker is in an offside position but neither touches the ball nor affects an opponent. | No offense | Offside position alone is not punishable. |
| A player receives a corner kick directly while in an offside position. | No offside offense | A direct corner is an exception. |
| A defender deliberately plays the ball, which then reaches an attacker previously in an offside position. | Generally onside | Deliberate play by an opponent can reset the offside situation. |
| A defender deflects a teammate’s pass, and an offside-positioned attacker collects it. | Offside may be called | A deflection does not reset offside. |
How to judge an offside call step by step
- Find the moment of the pass. Freeze the play when the teammate plays or touches the ball. Do not judge by where the receiver is when the ball arrives.
- Check the attacker’s half. If the player is in their own half, they cannot be in an offside position.
- Compare the relevant body parts. Ignore the arms and hands. Compare the attacker’s head, body, or feet with the ball and the second-last opponent.
- Allow for level positions. If the attacker is level with the ball or the second-last opponent, they are onside.
- Look for active involvement. Check whether the player played the ball, interfered with an opponent, or gained an advantage from a rebound, deflection, or save.
- Check for an exception or reset. Consider whether the ball came directly from a goal kick, throw-in, or corner, or whether an opponent deliberately played it.
This order helps separate two questions that often get mixed up: where the attacker was, and what the attacker did next. Both matter. A player can be in an offside position without committing an offense.
How attackers stay onside and defenders use the rule
Attackers can time a run to begin as a teammate plays the pass. The goal is not simply to stay behind the defender throughout the move. It is to be level with or behind the second-last opponent, or behind the ball, at the moment of the teammate’s touch. A quick change of pace can create space without an early run.
Attackers should also pay attention to the ball. If the passer is already ahead of them, they may be onside even when they are beyond the defenders. But they still need to avoid interfering with an opponent if they are in an offside position.
Defenders often move forward together to leave attackers in offside positions. This is known as an offside trap. It can disrupt an attack, but it demands coordination: one defender staying deeper may keep the attacker onside. Defenders should not rely on the flag alone, since the referee decides whether an offense occurred and play may continue until a decision is made.
For players and coaches, the most useful habit is to watch the passer’s contact with the ball rather than the receiver’s arrival. That is the reference point for the position test. Replaying a moment in slow motion can help clarify where a player stood, but it should not obscure whether the player actually became involved.
What happens after an offside offense?
When the referee penalizes offside, the opposing team receives an indirect free kick. This means the ball must touch another player before a goal can be scored. The kick is taken from the place where the offside offense occurred, including the spot where the player became involved in play, interfered with an opponent, or gained an advantage.
The assistant referee commonly signals a suspected offside by raising a flag, but the referee makes the final decision. In matches with video assistant referee (VAR) support, eligible decisions may be checked under the competition’s video review procedures. The core rule remains the same: position at the teammate’s touch, followed by active involvement.
Common offside myths to avoid
- “Any attacker beyond the defenders is offside.” Not necessarily. The player may be behind the ball, in their own half, or level with the second-last opponent.
- “Being offside is an offense by itself.” It is not. The player must become involved in active play.
- “The goalkeeper is always the last defender.” The rule compares the attacker with the second-last opponent, whoever that is.
- “A defender’s touch always resets the play.” A deliberate play can reset the situation, but a deflection or deliberate save does not.
- “The referee judges where the receiver is when the ball arrives.” The position is judged when the teammate plays or touches the ball.
- “Hands count when checking position.” They do not. The head, body, and feet are the relevant parts.
One practical detail often missed: being in an offside position can still matter if the player never touches the ball. Blocking a goalkeeper’s view or challenging a defender can make the player actively involved. So, when checking a close call, look beyond the receiver and ask whether their presence affected an opponent.
The clearest way to understand what is onside and offside in football is to separate position from involvement. Judge the player when a teammate plays the ball, then check whether the player takes part in play or affects an opponent.
To assess a close call, pause at the pass and compare the attacker with the ball and the second-last opponent. Remember that level positions are onside, and a defender’s deflection does not automatically reset the situation.