The website, created by digital agency, The Gate, mirrors the real flag planting event which is to take place in Asnelles in Normandy on D-Day, June 6.
The website allows users to include a special message with their virtual flag and provides information on the 1944 invasion.
Once their flag has been planted, visitors will also receive an email link that can be embedded on any social networking profile, encouraging online friends to visit the site and make a donation to the Legion.
Further fundraising events by the Legion are also planned in Portsmouth on the day itself. These have been supported by local poster and radio campaigns, also created by The Gate.
Jeremy Prescot, client services director at The Gate, said: "Our online work for this campaign is about capturing the attention of a younger audience by using the strengths of the digital medium.
"This project has really achieved that by creating a simple, yet very powerful way, of giving thanks to our war heroes."
The launch of the Legion's project follows that of Google Earth engineer Sean Askay who launched a "map of the fallen" in honour of thousands of servicemen and women who have died in Iraq and Afghanistan.
He has developed a feature that allows browsers to see each of the 5,700 US, UK, and other coalition troops represented by a yellow pin connecting their home town to the spot where they died.
Visitors can view photos of the soldiers and pay their respects in a guest book using Google Earth 5, which is free to download.
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