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7 Reasons Covering Text in a PDF Isn't the Same as Redacting It
A black box drawn over text doesn't remove the text — here's what actually does
5 August 2026 · 6 min read
It's happened publicly, more than once: a government agency or a law firm releases a "redacted" PDF with black boxes over the sensitive parts, and someone discovers the black boxes are just shapes drawn on top — the text underneath is still there, selectable, copyable, sometimes even visible with a simple copy-paste into a text editor.
That's the difference between covering text and redacting it. A redact PDF tool that does it properly has to actually remove the content, not just draw over it. Here's what that means and how to check whether a tool is doing it right.
Key takeaways
- A black box drawn over PDF text does not remove the text — it's usually still there underneath, copy-pasteable
- This has caused real, public leaks when "redacted" documents were published with the black boxes removable
- Genuine redaction has to strip the actual content, not just cover it visually
- iGuardPDF's Redact PDF flattens any redacted page into an image before the text layer is discarded
- Pages you don't redact stay untouched, still selectable text
1. A rectangle on top of text is not redaction
Most "redact" features in basic PDF viewers just add a black shape as a separate layer above the existing text. Select the text underneath (or delete the shape) and it's fully readable again. If a tool lets you drag the black box afterward, that's a strong sign it's still just a shape, not a real redaction.
2. Real redaction rasterizes the page
The only reliable way to guarantee text is gone is to turn the page into a flat image with the redaction baked into the pixels, then discard the original text layer entirely. That's what iGuardPDF's Redact PDF does — any page you draw a box on gets flattened to an image with the black-out already part of it. There's nothing left to select underneath.
3. Check a redaction by trying to select the text
After redacting, try to click and drag-select over the black box in a PDF reader. If text highlights, the redaction failed. This is the single fastest way to verify any redact PDF tool actually did its job, on any tool, not just this one.
4. Pages without redaction boxes stay untouched
Rasterizing an entire document just to redact one line on one page would be wasteful and would make the rest of the document worse (larger file, no longer selectable text). A properly built redact PDF tool only flattens the pages that actually need it — the rest stay exactly as they were, still real, selectable text.
5. It's a draw-a-box interaction, not a technical exercise
You shouldn't need to understand PDF internals to redact a document correctly. Drag a box over what needs to disappear, on however many pages need it, and download — the flattening happens automatically underneath.
6. Free, with no cap on how many documents you redact
Redact PDF is free with no signup, and there's no limit on how many pages or documents you can redact — relevant if you're working through a batch of files that all need the same treatment.
7. Fingerprint the redacted result if it's going out publicly
If a redacted document is being shared outside your organization, turning on Guarded fingerprints the final PDF and gives you a revocable link — so if it leaks somewhere it shouldn't, you can trace which copy it was.
Beyond this tool: building a complete workflow
Redaction is often part of a bigger cleanup pass on a document:
"Redacted" should mean gone, not covered. Before trusting any tool with genuinely sensitive information, test it: redact something, then try to select the text underneath the black box. If you can read a single character, it isn't redaction — it's decoration.
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- Every upload and download runs over TLS (HTTPS) — your file never crosses the network unencrypted.
- Files are processed to run the tool you asked for, then deleted. We don't archive uploads or keep a copy afterward.
- Free tools need no account, so there's no identity to build a tracking profile against in the first place.
- Nothing you upload is ever used to train an AI model, ours or anyone else's.
Full breakdown on our Security page.