FindMyPast has uploaded some 500,000 cemetery records from BillionGraves to its database.
The records consist of transcriptions and links to the relevant entries on the BillionGraves site.
Most of the collection relates to gravestones and memorials in England, Scotland and Wales.
The Ireland collection is small, with just 4,129 entries; more than half are from South Tipperary, and there are no entries for counties Kerry, Leitrim, Longford, Monaghan, Offaly, Roscommon and Westmeath.
FindMyPast say the index will be regularly updated throughout the year.