Goal-line technology (GLT) in soccer is a decision aid that checks whether the entire ball crossed the goal line between the posts and beneath the crossbar. When an approved system detects a goal, it sends a rapid signal to the match officials. It does not review fouls, offsides or penalty decisions; those are separate matters.
The core rule comes from IFAB Law 1 (The Field of Play), checked October 11, 2026.
When has the ball crossed the line?
Soccer requires the whole ball to pass over the whole goal line for a goal to be scored, provided the goal is otherwise legal. A tiny part of the ball still directly over the painted line means it has not completely crossed. The direction of the goalkeeper’s dive or where the goalkeeper’s hands are positioned does not change that geometric requirement.
Camera angles on television can be misleading because the line and ball have thickness and perspective. The approved technology is designed to answer that narrow physical question without relying on a guess from a single replay frame.
How does the referee get the decision?
Under the current IFAB Law 1, GLT is used solely for goal-line decisions. If a goal is detected, the decision indication must be immediate and automatically confirmed within one second, using the referee’s watch through vibration and a visual signal, and/or an official headset. The information may also be supplied to the video operation room.
Competition rules must explicitly allow its use. Organizers must also make sure the system meets the relevant FIFA quality requirements, and the referee must check the system before the match. If it fails the prescribed test, the match cannot rely on it.
Is goal-line technology the same as VAR?
No. GLT answers whether the ball crossed the line. VAR can assist with defined match-changing decisions, such as goal validity and penalty decisions under the applicable protocol. GLT does not decide whether an attacker was offside, whether the scorer committed a foul, or whether a ball should have been in play in the build-up.
For example, the technology may confirm the ball entered the net, but a goal may still be disallowed for an earlier offside offence. Review the offside rule for the separate legal test.
What if the stadium does not have GLT?
Goal-line technology is optional depending on the competition. In a match without an approved system, the referee and assistant referees apply the same rule using their on-field observations and any other assistance allowed in that specific competition. An amateur match is not automatically invalid because it lacks a watch alert.
The presence of cameras, a video board or a stadium replay screen alone does not mean that official goal-line technology is operating. The system must be part of the competition’s approved officiating setup.
Three examples to recognize on television
- Keeper catches on or just behind the line: play continues unless the entire ball has crossed; GLT can resolve the geometry where fitted.
- Defender clears from inside the goal: a goal should be awarded if the ball had wholly crossed before the clearance, regardless of how fast it was removed.
- Ball crosses, scorer was offside: GLT establishes the crossing, not whether the attacking play was legal.
If you are unsure about timing in a disputed attack, our guides on extra time and penalty-kick rules cover different parts of match administration.
Frequently asked questions
Does the whole ball have to cross the line?
Yes. A ball merely touching or hanging over part of the line does not satisfy the whole-ball requirement.
Does GLT tell the referee whether there was offside?
No. GLT is restricted to whether the ball crossed the goal line.
Do all leagues use goal-line technology?
No. Competitions decide whether to use an approved system under their rules.
Official sources and photo credit
- www.theifab.com rules or guidance (checked October 11, 2026)
- www.theifab.com rules or guidance (checked October 11, 2026)
- Featured photo: Santeri Viinamäki / Wikimedia Commons, Creative Commons by-sa/4.0. Unmodified.
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