For the macro to work, you will need to add in four extra columns named: DocFolderPath, DocFileName, PdfFolderPath, and PdfFileName. These should be exactly as written here, with no spaces and each word capitalised.

Sub MailMergeToPdfBasic() ‘ Mark the start of the Subroutine (i.e. Macro) and name it “MailMergeToPdf”
‘ Macro created by Imnoss Ltd
‘ Please share freely while retaining attribution
‘ Last Updated 2021-05-03
Dim masterDoc As Document, singleDoc As Document, lastRecordNum As Long ‘ Create variables (“Post-it Notes”) for later use
Set masterDoc = ActiveDocument ‘ Identify the ActiveDocument (foremost doc when Macro run) as “masterDoc”

masterDoc.MailMerge.DataSource.ActiveRecord = wdLastRecord ‘ jump to the last active record (active = ticked in edit recipients)
lastRecordNum = masterDoc.MailMerge.DataSource.ActiveRecord ‘ retrieve the record number of the last active record so we know when to stop

masterDoc.MailMerge.DataSource.ActiveRecord = wdFirstRecord ‘ jump to the first active record (active = ticked in edit recipients)
Do While lastRecordNum > 0 ‘ create a loop, lastRecordNum is used to end the loop by setting to zero (see below)
masterDoc.MailMerge.Destination = wdSendToNewDocument ‘ Identify that we are creating a word docx (and no e.g. an email)
masterDoc.MailMerge.DataSource.FirstRecord = masterDoc.MailMerge.DataSource.ActiveRecord ‘ Limit the selection to just one document by setting the start …
masterDoc.MailMerge.DataSource.LastRecord = masterDoc.MailMerge.DataSource.ActiveRecord ‘ … and end points to the active record
masterDoc.MailMerge.Execute False ‘ run the MailMerge based on the above settings (i.e. for one record)
Set singleDoc = ActiveDocument ‘ Identify the ActiveDocument (foremost doc after running the MailMerge) as “singleDoc”
singleDoc.SaveAs2 _
FileName:=masterDoc.MailMerge.DataSource.DataFields(“DocFolderPath”).Value & Application.PathSeparator & _
masterDoc.MailMerge.DataSource.DataFields(“DocFileName”).Value & “.docx”, _
FileFormat:=wdFormatXMLDocument ‘ Save “singleDoc” as a word docx with the details provided in the DocFolderPath and DocFileName fields in the MailMerge data
singleDoc.ExportAsFixedFormat _
OutputFileName:=masterDoc.MailMerge.DataSource.DataFields(“PdfFolderPath”).Value & Application.PathSeparator & _
masterDoc.MailMerge.DataSource.DataFields(“PdfFileName”).Value & “.pdf”, _
ExportFormat:=wdExportFormatPDF ‘ Export “singleDoc” as a PDF with the details provided in the PdfFolderPath and PdfFileName fields in the MailMerge data
singleDoc.Close False ‘ Close “singleDoc”, the variable “singleDoc” can now be used for the next record when created
If masterDoc.MailMerge.DataSource.ActiveRecord >= lastRecordNum Then ‘ test if we have just created a document for the last record
lastRecordNum = 0 ‘ if so we set lastRecordNum to zero to indicate that the loop should end
Else
masterDoc.MailMerge.DataSource.ActiveRecord = wdNextRecord ‘ otherwise go to the next active record
End If

Loop ‘ loop back to the Do start
End Sub ‘ Mark the end of the Subroutine