Sign & Protect · Use case

Permanently Hide Sensitive Information in a PDF

Covering sensitive text with a black box doesn't actually remove it — the text is still in the PDF's data layer and can be extracted by anyone with basic tools. True redaction permanently destroys the underlying content. OneClickPDF performs real redaction by rasterizing the entire page after applying redaction areas.

Updated 22 February 20262 min read4 steps

On this page · 3 sections

The Problem

You need to share a document but it contains sensitive information — social security numbers, financial data, personal details, confidential clauses — that must be permanently removed, not just visually hidden.

How It Works

  1. Open the Redact PDF tool

    Go to OneClickPDF's Redact tool.

  2. Upload the sensitive document

    Drop your file. It loads entirely in your browser — critical for documents with sensitive content.

  3. Mark content for redaction

    Draw rectangles over sensitive areas, or use Find Text to search for specific words (like names, numbers, or addresses) across all pages. Review pending redactions in the sidebar.

  4. Apply permanent redaction

    Click Apply. The tool draws black over marked areas, then rasterizes every page at 2x resolution. The original text data is physically destroyed — it cannot be recovered.

Frequently Asked Questions

Is this actual redaction or just a black box?
Actual redaction. After marking areas, OneClickPDF rasterizes every page into a flat image. The original text data is completely destroyed — there is no hidden layer to extract, no copy-paste trick, no metadata to mine.
Can I search for text to redact across all pages?
Yes. Find Text mode searches the entire document for a specific word or phrase, highlights all matches, and lets you add them all to the redaction list. Perfect for removing all instances of a name or number.
My document never leaves my device?
Correct. The entire process — text search, redaction drawing, and rasterization — happens locally in your browser. Your sensitive document is never transmitted or stored anywhere.
Can I undo a redaction after applying?
No. Applied redactions are permanent — that's the entire point. Review your redactions carefully in the sidebar before clicking Apply. You can remove individual pending redactions before applying.

True redaction is irreversible by design. Unlike drawing a black rectangle (which many tools call 'redaction'), OneClickPDF destroys the underlying text data by rasterizing the entire page. For legal, medical, and financial documents, this is the level of protection you need.

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Open Redact PDF