What it does
Creates a masked copy of the columns you choose on a new sheet, so you can share the file without showing sensitive values. Your original sheet is not changed. Identity numbers, tax numbers, card like numbers, names, emails, phone numbers and account numbers can be hidden while the text still looks realistic and leading zeros are kept. This runs inside Excel and your workbook is not sent anywhere. There is no undo because a new sheet is created, so delete that sheet if you do not want it.
Your data is processed on your own computer. Your Excel contents are never shared with AI services.