Removes text from a PDF for good, in the browser. List the words or phrases to redact, add a regular expression for patterns such as card or account numbers, or give explicit rectangles in points. The matched glyphs are deleted from the page content — copying text out of the saved file returns nothing — and a filled box is painted over the area so the redaction is visible. Everything else is copied byte-for-byte. Text that is part of an image is covered but cannot be removed this way.