Prime Minister Julia Gillard isn't budging on dropping the unpopular internet filter, saying it is a moral judgment the government needs to make.

The coalition and the Greens are unlikely to support proposed new laws that will see inappropriate content filters through internet service providers.

But, Ms Gillard remains defiant: "The internet filter is appropriate".

"It is unlawful for me to go to the cinema and watch some certain sorts of content, that's unlawful, we believe it to be wrong," she told the Queensland Media Club in Brisbane on Tuesday.

"Content that is child abuse, incredibly violent pornography, we say that is wrong and we don't show it in Australian cinemas.

"If we accept that, then it seems to me the moral question is not changed by the medium that the image has come through."

She said the government is working through how the internet filter could be introduced without slowing down connection speed or accidentally banning content that is appropriate.

Under the plan, all Internet Service Providers (ISP) in Australia would be required to use a filter to block sites that are refused classification by the The Australian Communications and Media Authority, including child sexual abuse imagery, bestiality, sexual violence, detailed instruction in crime, violence or drug use and material that advocates the doing of a terrorist act.