From today, all of those documents are now available for the public to view for the first time.
The documents give a unique insight into the process of commemoration undertaken by the Army and the CWGC after WW1, and include details of personal headstone inscriptions, date of death, rank, regiment and even some documents which show the journey of the deceased to their final resting place.
"The documents are a window into the commission's past, and the incredible work carried out after the war, to ensure those who died will not be forgotten," said Andrew Fetherston, CWGC archivist and records manager.
"As working documents, it is fascinating to see the typed and handwritten lists, the corrections and notes as they strived for accuracy.
"For the families of those we commemorate, these records give a snapshot into the processes by which their relatives would have been identified and buried, or commemorated on a memorial, and give a direct link back to a time in the immediate aftermath of the war."
Also launched today is the Discover 14-18 microsite that features a timeline and events calendar for WW1.
Content is themed around major battles and the different roles of the Army, Navy and Air Force, all linking back to the CWGC memorial sites and the new online archives.