Visible measures such as Automatic Number Place Recognition (ANPR), security cameras and heavy security barriers will be put in place -- the latter to mitigate the threat of cars being used to attack the crowd.
More security will be in place once people arrive in Windsor, including a screening and search regime, and any items that may pose a risk to the public will be removed.
If too many people descend on Windsor, the town will be put on virtual lock-down, with trains no longer stopping to drop passengers off at its stations and people turned away from crowded processional routes.
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A brewery in Windsor, the British town where Prince Harry will marry American Meghan Markle in May, believes it has concocted its own ideal pairing with a "royal beer" celebrating the occasion. On the big day, visitors may be stopped and checked by police officers.
Thames Valley Police, responsible for policing the event, said the security operation was likely to be the largest in its history.
The royal couple announced this week that the Armed Forces, who have a special connection to Prince Harry, will be providing ceremonial support during the couple's wedding and carriage procession.
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A spokesman said: "Residents, local businesses and visitors to the town can expect to see an increased police presence, police officers, both armed and unarmed, search dogs, the mounted section, the roads policing unit and the National Police Air Service". Last month, we learned about Windsor Knot a beer created by a brewery in Eton, in honor of the upcoming royal wedding.
There will also be Royal Borough of Windsor and Maidenhead community wardens and ambassadors throughout the town centre.
The wedding day will feature regiments and units that have a special relationship with Prince Harry, who served in the military for a decade and was deployed on frontline duties twice in Afghanistan.
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The force says the majority of those working on the operation will be from Thames Valley but other forces, such as British Transport Police, the Metropolitan Police and Surrey Police, will also be involved.