Deck module allow you to import any stock file format import . See import cards for more details

Online web import

MTGCompanion have many sniffer to get deck directly from online website.

You can manage plugins here

Select Import / Online / Website Menu

The Panel allow you to select the website

if the selected sniffer allow you to filter search with a card in deck, you will be able to choose a card, and will be add to the search filter

click on to choose the card, or to remove it.

Then apply suggested filters and choose your deck and press button