QuickMergeRedact a PDF — Black Out Text Permanently
Short answer: To permanently redact sensitive PDF content, select the information and export a rasterised copy with black boxes burned into every page. This removes the entire text layer and other interactive page objects, not only the marked characters.
Automatically finds SSNs, credit-card numbers, emails, phone numbers, and your own keywords — then blacks them out permanently. The redacted copy has no text layer to un-hide. All in your browser.
Matches cover complete PDF text fragments to avoid leaving part of a word visible. Nearby words in the same fragment may also be removed. Inspect every exported page before sharing.
How do I permanently redact text in a PDF?
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Findings
True Redaction — Not a Black Box You Can Copy-Paste Under
The redaction horror story is always the same: someone draws a black rectangle over text, the text remains underneath, and a journalist or opposing counsel simply selects and copies it. This tool takes a different route. First it detects sensitive data by pattern — Social Security numbers, credit-card numbers (validated with the Luhn checksum), email addresses, phone numbers, IBANs, plus names or keywords you add. Every match starts selected, and you can deselect false positives. It then redacts by rasterization: each complete page is re-rendered as an image with the selected black boxes burned in, and a new PDF is built from those images. The output has no original text layer, links, form fields or annotations anywhere on the page.
Detection and redaction both run in your browser, which matters precisely because the documents you redact are the ones you least want uploaded. Everything runs on your device via open-source browser libraries — your files are never uploaded. You can verify it yourself.
Next steps
Related tools
- remove a signature from a PDF — a different job: deleting an object rather than removing text.
- verify nothing was uploaded — especially important for documents you are redacting.
What to do with the result
- inspect the rebuilt file metadata — the original properties are not carried over, but the new PDF may contain producer and creation fields.
- encrypt the redacted file — before it leaves your device.
Browse all PDF tools, or see every QuickMerge tool.
No completed size benchmark is published for this tool. See measurement coverage and limitations; stated upload limits are application guards, not tested device capacity.
Try a reproducible check
These downloadable fixtures are synthetic QuickMerge examples, with no customer data. They are small functional checks, not speed or size-limit benchmarks.
Document checks (PDF). Open the tool.
Enter SAMPLE-789 as a keyword, scan, confirm that the matching finding is selected, and export. Open the downloaded copy, search for the token, try selecting it, and inspect the visible area. Check metadata and other occurrences separately. A black rectangle in the editor alone is not proof that a confidential value was removed.
Frequently Asked Questions
Yes. Unlike drawing rectangles over text, this tool rebuilds the PDF from page images with the black boxes burned into the pixels. The output has no text layer at all — copy-paste, search, and text-extraction tools recover nothing.
The redacted copy behaves like a high-quality scan: it is no longer searchable or selectable (that is the point), and the file size may change. Keep your original for reference and share only the redacted copy.
SSNs (123-45-6789), credit/debit card numbers (Luhn-validated), email addresses, phone numbers, and IBANs — plus any custom words or names you type in, such as a client name or project codename.
Image-only scans have no text layer for this detector to locate or map to page coordinates. Adding a custom keyword does not change that, and this interface has no manual box-drawing mode. Use a redaction editor with manual region selection for that file, then inspect the exported pixels carefully.
Mark the region and download the result. Every page is rebuilt as an image with the black boxes burned into its pixels, so no original text or interactive page objects remain in the output.
Only if the scan already has an OCR text layer that lets this tool locate the target. An image-only scan produces no findings, and this interface has no manual region-selection control. Use a tool that lets you draw and flatten boxes over the scan, then verify the exported pixels.
How to redact in a PDF without leaving the text behind
Redaction has a specific failure mode that looks like success on screen. Knowing what to check is most of the skill.
Work through the document, not just the obvious page
Pattern detection finds supported identifier shapes and supplied keywords in extracted text. It can miss an unusual format or select a harmless match. Review every proposed mark and read the complete document for identifying context that a pattern cannot recognize.
Verify the downloaded file, not only the preview
Open the downloaded copy and inspect each marked area at high zoom. Searching should return no text anywhere because this implementation rasterises every complete page, not only the marked regions. That loss of search and selection is an intentional trade-off.
Automatic detection needs a text layer
A scan has no searchable characters, so pattern and keyword detection cannot locate its sensitive areas unless an OCR text layer is already embedded. This interface has no manual box-drawing control and will not export when it finds nothing; use a redaction editor with manual region selection for an image-only scan.
Rasterisation changes the whole document
The rebuilt copy does not preserve selectable text, links, annotations, form fields, layers or the original content streams. Document metadata is not promised to survive. Keep the source file under access control and verify the output before it goes out.