More than half a million students across Australia will stand together against bullying as they mark the third National Day of Action on the problem.

The actions against bullying comes as a survey suggested that parents need more support when their child is the bully.

More than 600,000 students from nearly 1500 schools will stand together on Friday to show they are committed to having schools free from bullying, harassment and violence.

Federal Education Minister Peter Garrett said the day was being marked by the launch of a new website, "Bullying, No Way!", dedicated to safe school resources, a new iPad app for younger children and new curriculum material on bullying.

"These new resources will help start conversations between parents and their children and between teachers and their students," Mr Garrett said in a statement.

"By standing together to say no to bullying and violence we can build positive school communities."

Meanwhile, a survey by National Youth Mental Health Foundation Headspace said only 14 per cent of parents are confident they would know the signs that their child is bullying others.

Chris Tanti, CEO of Headspace, said bullying behaviour can be a red flag that a child might be going through a tough time and it's important to spot the warning signs.

"Look out for changes in behaviour like increased frustration and aggression or if they are becoming more argumentative or defiant than usual."