The Football Offside Rule Explained Simply (With VAR and Semi-Automated Offside)

Few rules cause as many arguments among football fans as offside. The idea is simple, but the details can be tricky, especially when a goal is ruled out by a few centimetres. This guide explains the offside rule in plain language and shows how technology helps officials. You can follow decisions as they happen on our football live scores page.

Why the offside rule exists

Without offside, an attacker could wait next to the opposing goalkeeper all game and simply tap in long passes. The rule stops that "goal-hanging" and encourages teams to build play across the whole pitch. It is one of the oldest laws of the game, and its modern form has been refined many times.

The basic rule

A player is in an offside position if, at the moment a teammate plays or touches the ball, any part of their head, body or legs is closer to the opponents' goal line than both the ball and the second-last opponent. The goalkeeper usually counts as one of the opponents, so in most cases this means the attacker is ahead of the last outfield defender.

Hands and arms are not counted for this purpose, because players cannot legally score with them. Only the parts of the body that can score a goal matter.

Being in an offside position is not an offence

This is the most misunderstood part. A player is only penalised if they are in an offside position and become involved in active play. That means:

• Interfering with play: touching or playing the ball that a teammate has passed or touched.
• Interfering with an opponent: blocking the goalkeeper's line of sight, challenging for the ball, or clearly attempting to play it.
• Gaining an advantage: playing a ball that rebounds off the post, the crossbar or an opponent after being in an offside position.

If the player in an offside position does none of these things, the game continues.

When a player cannot be offside

• When they are in their own half of the pitch.
• When they are level with the second-last opponent or the last two opponents. Level is onside.
• When they receive the ball directly from a goal kick, a throw-in or a corner kick.

Also remember that the moment that counts is when the pass is played, not when the attacker receives it. A forward who starts a run from an onside position and receives a through ball is fine, even if they are well ahead of the defence when they collect it.

A worked example

Imagine a striker standing just behind the last defender when the midfielder plays a through ball. At that moment the striker is onside, so the pass is legal. If the striker was even a toe ahead of the last defender when the pass was struck, they are in an offside position; if they then run onto the ball, the flag goes up. The distance between them when the ball arrives is irrelevant.

VAR and semi-automated offside

The Video Assistant Referee (VAR) checks offside for goals and other key moments. Officials use camera angles to freeze the frame at the moment the ball is played and draw lines to compare the position of the attacker and the defender. Many top competitions now also use semi-automated offside technology, which tracks the ball and a set of points on each player's body using multiple cameras, then produces a 3D animation of the decision. This makes calls faster and more consistent, although fans still debate the cases that are separated by tiny margins.

For goals, the benefit of the doubt does not belong to the attacker or defender: the technology simply reports whether any part of the scoring-eligible body was ahead of the line at the moment of the pass.

Quick summary

1. Offside position is judged when the ball is played by a teammate.
2. You are only penalised if you then get involved in active play.
3. You cannot be offside from a goal kick, throw-in or corner, or in your own half.
4. Level is onside.

Use these four points the next time a goal is chalked off and you will understand exactly why. If you are new to the sport, our Premier League hub is a great place to see these decisions in context.