Australians will now be able to enrol to vote online after the Federal Court ruled in favour of political activist group GetUp!'s case against the Australian Electoral Commission (AEC).

GetUp! had taken the AEC to the court, challenging electoral laws that prevented voters from enrolling online.

It is the group's second court win in as many weeks.

Last week the High Court ruled Howard government changes that closed the electoral rolls on the day writs were issued were unconstitutional.

GetUp! national director Simon Sheikh says today's decision is historic.

"With 1.4 million Australians not on the electoral roll earlier this year, we need to do every single thing we can to get bureaucracy and red tape out of the way," he said.

"We know that we pay our taxes online, that we do our banking online and we should be able to enrol to vote online."

He said GetUp! would be campaigning to allow online enrolments in all future elections, starting with the Victorian state poll in November.

"What [the ruling] means is that in future the AEC should provide a safe and secure form on their own site for people to enrol to vote online," Mr Sheikh said.

"It is now upon the AEC to provide such a website themselves. It's appropriate that they enrol people online, not just a third party.

"The AEC had argued that they couldn't accept online enrolments [by law], but we shouldn't be discriminating between enrolments - faxing it or submitting it online should be the same."

When asked for his reaction to the ruling, Opposition Leader Tony Abbott said it was vital to have safeguards in place to ensure people did not enrol for invalid reasons.

"I think it's very important that we maintain the integrity of our electoral system," he said.

"I have a lot of trust in the Australian Electoral Commission, but I do think it's important there are safeguards in the system."