The Brexit transition period with the EU is due to end on 31 December, with UK travellers facing a range of new requirements when visiting one of the 27 EU members from 1 January onwards.
These include travellers having to ensure their passport is less than 10 years old and has at least six months validity left.
British travellers to the EU may also have to take out health insurance, as European Health Insurance Cards (Ehic) will not longer be valid, as well as possibly needing a international drivers licence in some countries.
Holidaymakers wishing to take pets on holiday to EU countries cannot continue to use the pet passport system and will have to follow a different process taking around four months.
From 1 January, UK phone users will also no longer be guaranteed free mobile phone roaming throughout the EU, Iceland, Liechtenstein and Norway.
The government campaign, entitled Going to Europe next year?, will feature advertising in online and print publications, as well as social media activity.
The campaign will direct consumers to a dedicated web page with the details of the changes they need to know about from the start of 2021.
Wendy Morton, European neighbourhood minister, said: "By bringing together all the information they need to know in one place so they can plan in advance and get on with their trip."
