How to redact a PDF so the text is actually gone

Drawing a black rectangle over text does not remove it. Here's the difference, and how to check your own file.

Redaction failures are a genre of news story. A court filing, a government report or a corporate disclosure goes out with names blacked out — and within hours someone has copied the text straight out from underneath the boxes. The cause is nearly always the same: the black rectangle was drawn on top of the page while the original text stayed in the file, perfectly intact and perfectly selectable.

Why a black box isn't redaction

A PDF is not a picture of a page. It is a set of instructions — draw this text, in this font, at this position — plus any graphics layered over them. Adding a filled rectangle adds one more instruction. It hides the words from your eye, but the text instruction is still there, and any PDF reader, text extractor or copy-paste will happily retrieve it. Highlighting the area in a word processor and exporting again often has the same problem.

Genuine redaction means the covered content is not in the output file at all.

How this tool does it

When you draw boxes on a page, Toolsfully re-renders that page as an image with the boxes painted in during rendering, then rebuilds the PDF around it. The words underneath were never written to the new file, so there is nothing to recover. Pages you didn't touch are copied across untouched, which means the rest of your document keeps its selectable, searchable text.

The trade-off is honest and worth understanding: a redacted page becomes an image. Its text is no longer selectable or searchable, and the file is larger. That is the price of the guarantee.

Step-by-step

1. Open the tool. Go to PDF Tools and choose the "Redact" tab.
2. Load your PDF. It opens in your browser; nothing is sent anywhere.
3. Draw over anything sensitive. Drag a box across each name, number or address. Use "Undo last box" if you overshoot, and move through the document with the page arrows.
4. Choose an output quality. Higher quality means a sharper page and a larger file.
5. Redact and download. The tool then re-opens its own output, attempts to extract text from every redacted page, and reports what it found.

What redaction does not cover

• Metadata. Author, title and editing history live outside the page content. Run the Metadata tool as well, or use Sanitize before sharing.
• Attachments and annotations. Comments and embedded files are separate structures.
• Information you didn't cover. A letterhead, a signature, a reference number in a footer, or a name that also appears three pages later.
• Inference. If a redacted name is the only four-letter name in a list of known people, the box does not undo the deduction.

Frequently asked questions

Can I check a PDF someone else redacted?

Open it in a reader and try selecting the blacked-out area, or paste the page into a text editor. If words appear, the redaction was cosmetic.

Does the file leave my computer?

No — rendering, redaction and verification all happen in your browser, which matters more here than almost anywhere else on the site.

Is this good enough for legal or medical disclosure?

The removal itself is genuine and the tool verifies it. Whether your particular obligation is met — including metadata, attachments and what remains visible — is a judgement only you or your professional adviser can make.