Really removed. Drawing a black box over text in most editors leaves the words underneath, where anyone can copy them. Think Pages turns each redacted page into a picture with the boxes painted in, so the hidden words are no longer in the file. The rest of the page's text is kept, so it can still be searched.

Yes. Draw boxes by hand, or let Think Pages read the scan with OCR so it can find names and numbers for you.

It finds what you search for and common details such as email addresses, phone numbers, account and card numbers, and postcodes. Always look through every page before sharing, and draw boxes over anything it missed, such as signatures or photos.

No. Redaction happens in your browser, on your device. That matters most for exactly the documents people redact.