To apply for an ETA (신청) online you must be outside Australia.
An ETA is for short term stays for tourism or business visitor activities.
You must have your passport, email address and a valid credit card to complete the online application.
The details you provide in your online ETA application need to be exactly the same as they appear in your passport. You must use the same passport that is linked to your online ETA application when you travel.
Anyone who arrives in Australia without a valid travel document, visa or authority can be refused entry to or delayed until their identity and claims to enter Australia have been confirmed.