Sometimes, it is necessary to redact documents before sending them out, and many offices resort to printing out the document and getting busy with a black marker pen, before copying or scanning in the document.
However, if you have an Apple Mac, then the in-built Preview app has a redaction tool which is really easy to use.
Simply open your document in Preview, click Tools >> Redact and then select the text or image you wish to redact. Save and then close the document, and that’s it.
Once you have closed the document, the redaction cannot be undone.