A black box drawn over sensitive text looks redacted — but if the original text is still sitting underneath it in the PDF's data, anyone who selects and copies that "hidden" text, or opens the file in certain PDF tools, can recover it in seconds. This has caused real, embarrassing leaks from governments and companies alike.

The Mistake: Covering vs Removing

A visual cover isn't redaction: drawing an opaque shape over text changes what's visible on screen, but the underlying text objects in the PDF are often completely untouched — select-all-and-copy, or an editor that ignores drawn overlays, can reveal exactly what was supposedly redacted.

What Actually Needs to Happen

True redaction removes the underlying text and image data entirely, not just visually obscures it — the sensitive content needs to be gone from the file's actual content, not merely painted over. Whether a tool does this or just draws a cosmetic box is the single most important thing to check before trusting a "redacted" file.

What to Actually Redact

  • Names, addresses, and contact details not relevant to the shared context
  • Account numbers, ID numbers, and financial details
  • Anything confidential unrelated to the specific reason you're sharing the document

An Honest Note About Our Whiteout Tool

Our PDF editor's Whiteout tool draws an opaque white box over content — genuinely useful for covering something before a screenshot, a printout, or casual internal sharing. But it does not strip the original text out of the PDF's underlying data: the covered text is still technically present in the file, just visually hidden. For anything you'd be worried about if someone bypassed the visual cover — legal documents, anything shared outside your organization, anything containing real financial or identity data — don't rely on a whiteout box alone.

When You Need Guaranteed Removal

For genuinely sensitive content, the safest approach is to flatten the page to a plain image after covering it (screenshotting the page and rebuilding the PDF from images strips all underlying text), or use a dedicated redaction tool built specifically to guarantee removal, not just visual covering. Treat a simple whiteout as a "no big deal if someone somehow saw it anyway" tool, not a security boundary.

Step-by-Step: Cover Content in a PDF

  1. Open your PDF in the editor
  2. Use the Whiteout tool to cover the content you want hidden
  3. For casual use, download and share as normal
  4. For genuinely sensitive content, flatten to images or use a dedicated redaction tool instead

Try It Yourself

Use our free PDF Editor's Whiteout tool to cover content

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