The offside rule explained simply — with clear examples

No rule in football starts more arguments than offside. The good news: the core idea is simple once you strip away the noise. Here it is in plain English.

The one-sentence version

A player is offside if they are nearer to the opponent's goal line than both the ball and the second-to-last defender at the moment a teammate plays the ball to them — and then get involved in the play.

The "second-to-last defender" is usually the last outfield defender, because the goalkeeper is normally the last. So in practice you compare the attacker to the last defender.

The three things that must all be true

For an offside offence, every one of these has to apply:

1. The attacker is in the opponent's half.

2. They are ahead of the ball and the last defender when it's played.

3. They become involved in active play — touching the ball, challenging an opponent, or gaining an advantage from that position.

Miss any one of those and there is no offence.

When you are NOT offside

• You can never be offside in your own half.
• You are not offside if you're level with the last defender (or the ball).
• There is no offside straight from a goal kick, throw-in or corner.
• Being in an offside position is not an offence on its own — only if you get involved.

Position vs. offence

This is the part fans miss. A striker can stand in an offside position all day and it means nothing. The flag only goes up when the ball is played and that player interferes — receiving it, blocking the keeper, or playing a rebound. That's why you sometimes see a player in front of the defence and no flag: they didn't touch the ball or affect anyone.

How technology calls it now

At the top level, semi-automated offside technology uses multiple cameras and a sensor in the ball to track players' limbs many times a second. It flags the exact frame the ball is played and measures whether any legal part of the attacker's body is beyond the last defender — then sends an animated 3D replay to the screens. It turns a split-second judgment into a measured one, which is why marginal calls now take a moment but come with a picture.

Want to see offside calls in context? Follow the action live in our match centre.

FAQ

Can you be offside from a throw-in, corner or goal kick?

No. The law specifically exempts all three restarts, so a player cannot be penalised for offside when receiving the ball directly from a throw-in, corner kick or goal kick. Offside applies again as soon as the next touch or pass is made.

Which body parts count for offside?

Any part of the head, body or feet that can legally score a goal is counted — for attackers and defenders alike. The hands and arms are excluded, which is why a striker's outstretched arm beyond the last defender is never offside on its own.

Is a player offside if they are level with the last defender?

No. Level is onside: an offence requires the attacker to be nearer the goal line than both the ball and the second-to-last opponent. If the review shows the players exactly in line, play continues.

What if a defender plays the ball to an attacker in an offside position?

A deliberate play by a defender — a controlled pass or clearance — resets offside, so the attacker can take the ball without penalty. But if the defender merely deflects the ball, or makes a deliberate save, the attacker is still judged offside from the original pass.