Black Rectangle Over PDF Text Is Not Redaction — Here Is What Actually Works

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Placing a black rectangle over sensitive text in a PDF does not remove the underlying data, which remains extractable via copy-paste or Ctrl+F. A slightly better method replaces text bytes in the content stream with placeholder characters, but this approach can leak the original text through kerning tables and fails with ligatures or shared page objects. The only reliable redaction method is to render each page as a raster image, paint over the sensitive areas, and rebuild the PDF without any text layer. This eliminates all extractable text, though it sacrifices file size efficiency and screen-reader accessibility. A simple verification test — selecting all text, copying it, and searching for redacted terms in a plain-text editor — can confirm whether a redaction is genuine or merely decorative.

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