Bonjour,
Essaie :
Sub Essai()
Dim I As Long, J As Long, Pos As Variant
With Sheets("Etiquette normal horizontale")
For I = 1 To Cells(.Rows.Count, 1).End(xlUp).Row Step 7
For J = 1 To 19 Step 3
If Len(.Cells(I, J)) > 2 Then
Pos = Len(.Cells(I, J)) - 2
.Cells(I, J).Characters(Pos, 2).Font.Size = 48
End If
Next J
Next I
End With
End Sub
Daniel