The new reporting system, called 'Step Up', is in use at Ballyclare High School and can be used at home, in school or on a smartphone.
The school believes it is the first system of its kind in Northern Ireland.
It means pupils can raise concerns with the appropriate teacher directly via the school website.
14-year-old Emma Blacoe, who helped develop it, said that teachers could receive a lot of information about alleged incidents.
"Pupils can upload files and pictures of screenshots and chats if they feel someone's in danger," she said.
"They can also simply just say if they're being pressured or bullied or if anyone else is."
If pupils click on a button on the school website they are taken to an online form where they specify their year group and who they want to deal with their concerns.
The information they provide cannot be seen by anyone but themselves and teaching staff, and they can choose to give their name or remain anonymous.
David Andrew, who also worked on 'Step Up', said that it was easy to operate and accessible to pupils.
"If pupils really feel there's something which needs to be sorted out they can do it," he said.
"Bullying is never acceptable and the sooner someone steps up, the sooner it can be sorted out."
The school's head of cyber safety, Mhairi Hill, said teachers would investigate every allegation they received information about.
"Staff will pick it up and the earliest opportunity and follow the procedure already in place for dealing with incidents," she said.
"With online bullying, pupils can come to us with screenshots and that's concrete evidence we can use to take the investigation forward.
"We would establish the facts before proceeding but we would follow up every report.
"If a child has felt it's necessary to raise the concern then it's worth following up in our eyes.
"We have a duty of care for our pupils and if a pupil's upset or distressed in class they're not going to learn to their full potential so it's important that we address these issues."

Mr Mallon said businesswoman Christine Bell and councillor Len Junier had criticised him and his fellow councillors for selling land at Acklam Hall for development.
They referred to it as "dodgy" on Twitter and at a council meeting.
Mayor Mallon said they now had to provide evidence of the claims.
The independent mayor said: "You have two people here who claim the sale of Acklam Hall was dodgy.
"What those people have got to do now is produce the evidence of malpractice, corruption, or criminality and I will give you a cast iron guarantee they will not be able to produce one shred of evidence.
"Now they've actually got to put up or shut up."
Mr Junier (Independent), who has asked the Secretary of State to investigate the sale of the land, said: "This was all about me having a duty to ask questions and raise concerns wherever they exist.
"All I want to know is did the taxpayers get the best deal possible for that land?"
The hall was valued at about Â£1m some years ago but Middlesbrough Council has refused to say how much it was sold for.
Critics said the 32 acres of land was worth more more than Â£20m.
Ms Bell told the BBC she had raised a matter of concern which had not yet been resolved and now awaits the outcome with interest.

The Plane Stupid demonstration on 13 July led to delays and the cancellation of 22 flights.
The activists, who were protesting against plans to expand the airport, allegedly cut a hole in a fence and chained themselves to railings.
Supporters chanted "No ifs, no buts, no third runway!" outside the court.
Sheila Menon, one of the accused, read a statement outside Uxbridge Magistrates' Court. She said the pollution and noise caused by air traffic at Heathrow was already blighting the area.
She said the proposed expansion - recommended by the Airports Commission in its final report last month - was driven by "wealthy frequent flyers" rather than ordinary holidaymakers.
Plane Stupid's actions were "reasonable, justifiable and necessary", said Ms Menon.
The activists were charged with aggravated trespass and entering a restricted area of the airport without permission.
They were bailed on condition that they do not enter Heathrow or its perimeter, with a trial expected to begin on 18 January.
Pupils at a County Antrim school have developed a new tool to target cyberbullying.
[NEXT_CONCEPT]
Middlesbrough Mayor Ray Mallon has referred himself to his council's standards committee in response to accusations a land sale was "dodgy".
[NEXT_CONCEPT]
Thirteen climate change activists have pleaded not guilty to charges of trespassing on Heathrow's north runway.