Cover Text in a PDF So It Cannot Be Uncovered — Free Tool

Searching "how to cover text in a PDF" returns dozens of tutorials showing you how to draw a black rectangle using annotation tools. Every one of those tutorials teaches an insecure method. The text is still in the PDF file, selectable under the rectangle. To actually cover text permanently, you need a tool that destroys the underlying data — like the free PDF redaction tool that flattens pages and removes text for good.

The Rectangle Trick Does Not Work

Here is what happens when you "cover" text with a rectangle in Preview, Chrome, Edge, or most free PDF editors:

1. You draw a filled black rectangle over text
2. The rectangle is added as an annotation layer
3. The text layer remains completely untouched
4. Anyone can: select the text through the rectangle, search for the words, copy all text from the page, or delete the annotation to reveal the text

This is not a theoretical vulnerability. It is trivially easy to defeat. A child can do it with Ctrl+A, Ctrl+C, and Ctrl+V into Notepad. If you have ever "covered" sensitive information this way and shared the document, the recipient could read everything you thought you hid.

The Correct Way to Cover PDF Text

1. Open the free redaction tool
2. Upload your PDF
3. Draw rectangles over the text you want covered
4. Click Apply Redactions
5. Download the result

The tool flattens each page to a raster image with your cover rectangles burned into the image. The text data is destroyed during flattening. No amount of selecting, searching, or editing can recover the covered text.

Visually, the result looks identical to drawing a black rectangle. The critical difference is what is happening to the data inside the file.

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When You Need to Cover Text in a PDF

Sharing documents with partial information. A report that needs some figures hidden from certain recipients. A contract where pricing should be covered when sharing with a non-party.

Preparing documents for public release. Any document going to a wide audience — a website, social media, a public filing — needs permanent covering, not cosmetic covering.

Removing outdated information. Old drafts with incorrect information that you want to keep in the archive but not have readable. Cover the wrong data rather than deleting the entire document.

Before forwarding. Someone emails you a PDF that contains both information you need to forward and information the recipient should not see. Cover the sensitive parts and forward the cleaned version.

Three Tests to Verify Your Cover Is Permanent

Test 1 — Select. Click and drag over the covered area. If text highlights underneath the black rectangle, the cover is fake.

Test 2 — Search. Ctrl+F and search for a word you know was covered. If found, the cover is fake.

Test 3 — Copy all. Ctrl+A to select everything on the page, paste into Notepad. If the covered text appears, the cover is fake.

A properly covered PDF (using the flattening method) passes all three tests. If your PDF fails any of them, redo the cover using the redaction tool before sharing.

Frequently Asked Questions

How do I cover text in a PDF so it cannot be uncovered?

Use a redaction tool that flattens pages to images. Drawing a shape over text is not enough — the text remains extractable. The free tool at WildandFree flattens pages and permanently destroys the covered text.

Can I cover text with a white rectangle instead of black?

This tool uses black rectangles. White rectangles would look invisible on a white page, which makes it unclear where content was removed. Black is standard for redaction because it signals that content was intentionally removed.

Does covering text affect the rest of the PDF?

The flattening process converts pages to images. All text on the page remains visually identical but becomes non-selectable. This ensures the covered text cannot be extracted by any method.

Is this free?

Yes. No subscription, no signup, no limits. Your PDF is processed locally in your browser.