Canada will increase security by tightening its rules on entering the country as of next month.

The new security measure will impact Europeans and others previously allowed visiting without a travel visa.

Formerly visa-exempt foreign nationals, including those passing through on a stopover, will have to fill out an online Electronic Travel Authorization (eTA) in advance and pay a small administrative fee (Can$7), starting March 15.

After completing the online form, permission to travel to Canada will be sent by email and will remain in effect for five years.

Americans will be exempt. Anyone caught unaware of the new regulations can expect some leniency in the beginning, said Robert Orr, deputy minister for immigration.

He said the new rules will affect more than three million travelers per year.