The 'Harry Potter' and 'Die Hard' star lent his signature tones to the One Click Giving project, which seeks to raise money for the Refugee Council and Save The Children by donating all the profits from advertising.
The project is the work of a group of Oxford University students, developed last year and published just before Christmas.
Alan Rickman at the 70th Venice Film Festival in 2013
With Rickman's sudden death from cancer aged 69 on Thursday, the project may now benefit from renewed interest - and the fact it appears to be one of his last works as an actor.
As creators of videos on YouTube can enter a partnership to share the revenue raised through adverts played around clips, the project hopes that with every view, funds raised will begin to mount.
Founder Oliver Phillips, 20, told HuffPost UK how the opportunity to bring Rickman onboard arose. He said: "We were fortunate enough to know someone who knew Alan and they put us in touch with him.
"He loved the project and invited us down to his house in London to do the recording.
"He was lovely and we tried a few different scripts with him, but all in all recording took less than 20 minutes.
"The beauty of YouTube is that the video will exist forever and just keep on accruing money for the causes.
"We'll split whatever is raised 50/50 with both the Refugee Council and Save the Children."
The Politics and History student had said at the launch of the video: “Together we can make a difference, all you need to do is watch and share.”
Students Olivia Phelan, James Altunkaya, Jake Wiseman, Aimee Kwan, Michaela Brady, and Annie Flynn joined Phillips in creating the initiative.
View and share the video on YouTube here: https://www.youtube.com/watch?v=HkiMz-e2ZcE