The Advertising Standards Authority is taking the online realm under its jurisdiction from March next year.
The authority already receives thousands of complaints about online ads each year, but does not yet have the power to take any action.
Websites found to be in breach of the ASA’s codes may find themselves appearing in a “rogues’ gallery” on the ASA websites.
The ASA will also have the right to publish a warning about products that do not comply with the code, which will appear in search results.
Most of the complaints received by the ASA are about misleading adverts, but the code is also designed to protect children and vulnerable groups.