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Don’t do this on a PDF document though. ;)

• jcul 2y ago
  Should be ok if you rasterize the PDF. Run something like pdftotext after to be sure it doesn't have any text. Or to be safe, print it and scan it, or just take a screenshot.
  • layer8 2y ago
    Testing that it doesn’t have text doesn’t help if the text was a bitmap in the first place. Normally the use case is that you still want to distribute it as a PDF, usually consisting of many pages, and without loss of quality, so the printing/scanning/screenshotting option may not be very practical. No, the real solution is to use an editor that allows you to remove text (and/or cut out bitmaps), before you add black rectangles for clarity.