Technology & Science

Most PDF Redaction Is Broken. Here's What "Real" Redaction Actually Requires.

hiyoyo·Dev.to·2h ago·1 min read

hiyoyo·Dev.to·2h ago · Saturday, April 25, 2026·1 min read

All tests run on an 8-year-old MacBook Air. Drawing a black rectangle over text is not redaction. The text is still there.

Select all, copy, paste into Notepad — it appears. This has leaked classified documents from actual government agencies. Multiple times.

Real redaction destroys the underlying data. Here's how I implemented it. What fake redaction looks like PDF structure (fake redaction):

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