The essential difference
Goal-line technology (GLT) determines whether the whole ball crossed the goal line; VAR checks specific refereeing decisions and incidents. GLT provides a quick signal to match officials. VAR involves a human review process using available evidence within the allowed categories.
They may be used in the same competition, but they are not interchangeable technologies.
How goal-line technology works
To award a goal under the Laws of the Game, the whole of the ball must pass over the goal line, between the posts and under the crossbar, without an offence that invalidates the goal. A ball appearing to touch the line is not enough.
FIFA describes GLT as a technical means of establishing whether the entire ball crossed the line. Approved systems may use optical cameras or other certified methods. When a goal-line crossing is detected, the information is sent privately to match officials, normally within one second.
The quick signal avoids the need for an ordinary lengthy video conference over that single geometric question. The referee remains the final authority and must apply the other Laws of the Game.
What VAR can check instead
VAR has a broader but tightly limited job. It can assist with a goal, penalty, red-card or mistaken-identity decision and certain defined 2026/27 exceptions. These include questions such as whether an attacker was offside before a goal, whether a challenge in the penalty area was an offence, or whether a reviewable handball occurred.
In some competitions VAR can help resolve goal/no-goal questions using video evidence, but this is different from an automated GLT signal. A close-to-the-line scene is not a substitute for understanding the rest of the attack.
Side-by-side comparison
| Question | Goal-line technology | VAR |
|---|---|---|
| Main purpose | Did the entire ball cross the line? | Was a permitted match decision clearly wrong? |
| Typical process | Automated signal to the referee | Video check and sometimes a formal review |
| Timing | Normally instant | Varies with footage and incident |
| Other fouls | Does not assess them | Can assess them within reviewable categories |
The distinction also helps explain why an attacking foul may still lead a referee to disallow a goal even after GLT has confirmed the ball crossed the line.
Where semi-automated offside fits
Semi-automated offside technology is a third system. Rather than deciding whether the ball crossed the goal line, it helps determine player position and the kick point for close offside calls. These technologies all use data, but they solve different problems and have different responsibilities.
That is why saying “the technology got the decision right” is too broad. It is better to identify which technology was used, what information it delivered and what football judgment the referee still had to make.
Frequently asked questions
Can goal-line technology overrule a foul?
No. It answers a goal-line crossing question, not whether the scoring team committed an offence.
Does every VAR competition have GLT?
No. Use of GLT and the particular VAR configuration depend on the competition’s equipment and approvals.
Why might a goal still be disallowed after GLT confirms the ball crossed the line?
Because a separate offence, such as offside or a foul in the attacking phase, may invalidate the goal.
Explore the wider VAR debate
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See the global VAR question →Primary sources
These sources explain the rules or technologies in their official context. Check competition-specific procedures where appropriate.