Batch convert XLS to XLSX

Solution 1:

Check out Office Migration Planning Manager.

The toolkit also contains the Office File Converter (OFC), which enables bulk document conversions from binary to OpenXML formats. (Technet)

Overview on Technet

Download Link

Note that you'll also need the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats for the OFC to work.
Both tools don't really seem to be supported anymore.

Solution 2:

I'd recommend using a macro to process the files within a folder to convert them from xls to xlsx. This code assumes that the files are all located within one folder and that all xls files need to be converted, but if you wanted to select individual files this code could be updated.

This code would need to be run from an Excel 2007 or above workbook.

Option Explicit

' Convert all xls files in selected folder to xlsx

Public Sub convertXLStoXLSX()

    Dim FSO As Scripting.FileSystemObject
    Dim strConversionPath As String
    Dim fFile As File
    Dim fFolder As Folder
    Dim wkbConvert As Workbook

    ' Open dialog and select folder
    With Application.FileDialog(msoFileDialogFolderPicker)
        .AllowMultiSelect = False
        .Show
        On Error Resume Next ' Prevent debug mode if user cancels selection
        strConversionPath = .SelectedItems(1)
        On Error GoTo 0      ' Re-enable default error handling
    End With

    Set FSO = New Scripting.FileSystemObject

    ' Check if the folder exists
    If FSO.FolderExists(strConversionPath) Then
        Set fFolder = FSO.GetFolder(strConversionPath)

        ' Disable confirmation dialogs (to prevent "unsaved changes" dialog popping up)
        ' and screen updates (to speed up conversion)
        Application.DisplayAlerts = False
        Application.ScreenUpdating = False

        ' Loop through files, find the .xls files
        For Each fFile In fFolder.Files
            If LCase$(Right(fFile.Name, 4)) = ".xls" Then
                ' Open temporary workbook
                Set wkbConvert = Workbooks.Open(fFile.Path)
                ' Save as OpenXML workbook - if your .xls files contain macros
                ' then change to FileFormat:=xlOpenXMLWorkbookMacroEnabled
                wkbConvert.SaveAs FSO.BuildPath(fFile.ParentFolder, _
                                    Left(fFile.Name, Len(fFile.Name) - 4)) & ".xlsx", _
                                  FileFormat:=xlOpenXMLWorkbook
                wkbConvert.Close SaveChanges:=False
                ' Delete original file
                fFile.Delete Force:=True
            End If
        Next fFile

        ' Re-enable confirmation dialogs and screen updates
        Application.DisplayAlerts = True
        Application.ScreenUpdating = True

    End If

End Sub

Note: If the files you are converting contain macros then you would need to update the FileFormat:=xlOpenXMLWorkbook to read FileFormat:=xlOpenXMLWorkbookMacroEnabled. Or if you don't need the macro code in the converted files you could leave it alone and it will remove the macros when it converts it to the xlsx format.

Solution 3:

So I wrote a simple VBScript to convert .xls files to .xlsx in a silent fashion.

./convert-xls-xlsx.vbs {path to folder containing .xls files}

convert-xls-xlsx.vbs:

Set args = WScript.Arguments
strPath = args(0)
strPath = CreateObject("Scripting.FileSystemObject").GetAbsolutePathName(strPath)
Set objExcel = CreateObject("Excel.Application")
objExcel.Visible = False
objExcel.DisplayAlerts = False
Set objFso = CreateObject("Scripting.FileSystemObject")
Set objFolder = objFso.GetFolder(strPath)
For Each objFile In objFolder.Files
    fileName = objFile.Path
    If (objFso.GetExtensionName(objFile.Path) = "xls") Then
        Set objWorkbook = objExcel.Workbooks.Open(fileName)
        saveFileName = Replace(fileName,".xls",".xlsx")
        objWorkbook.SaveAs saveFileName,51
        objWorkbook.Close()
        objExcel.Application.DisplayAlerts =  True
    End If
Next
MsgBox "Finished conversion"

NOTE: Look out for spaces in the folder path, if your path has a space in between, put the path in quotes.

Solution 4:

If you have LibreOffice or OpenOffice then you can use their CLI convert feature

for %f in (*.xls) do "path\to\libreoffice\soffice.com" --convert-to xlsx "%f"

%f needs to be changed to %%f in a batch file

You can also do that in PowerShell

ls -R *.xls |% { & "path\to\libreoffice\soffice.com" --convert-to xlsx $_.FullName }

# Or the full unaliased version:
Get-ChildItem -Recurse *.xls | ForEach-Object { `
    & "path\to\libreoffice\soffice.com" --convert-to xlsx $_.FullName }

In some versions you need to use libreoffice instead of soffice. And sometimes you need to add --headless before or after --convert-to to make it work

You can also use unoconv since it can convert "between any document format supported by LibreOffice/OpenOffice"

for %f in (*.xls) do unoconv -f xlsx "%f"