When I submit credit card information online, is it secure?

Yes.

JYSK uses industry standard SSL (Secure Sockets Layer) security technology that creates an encrypted connection between our website and your computer. You can tell that your connection to our website is protected by clicking on the address bar in your browser and looking for the “https://” at the beginning of the web address. Most modern browsers will also show a closed padlock icon next to the address while you’re browsing to let you know it’s secure.

JYSK’s web address will look like this: https://www.jysk.ca