QQudo Tools

Redact PDF

Permanently remove sensitive text and information from PDF files. Real redaction - the content is deleted, not just covered.

Your PDF never leaves your deviceFree to useNo sign-upTrue text removal100% local processing

Drop your PDF file here

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Supported format: PDF. The file is processed entirely in your browser.

Redaction permanently deletes content from the output file. Always keep a copy of the original PDF before applying.

What is PDF redaction?

PDF redaction is the permanent removal of sensitive content from a PDF document. True redaction deletes the underlying text and drawing instructions from the file, so the information cannot be selected, searched, copied or recovered. Stamping black rectangles over the page is not redaction - the text underneath stays fully recoverable. Qudo's redactor rewrites each marked page's content stream and removes the text runs inside your redaction boxes, flattening a page into an image only when the content cannot be removed surgically. Everything runs locally in your browser.

How to Redact a PDF

  1. Upload or drop your PDF file - it never leaves your device.
  2. Draw redaction boxes over sensitive areas, or drag across text lines to mark them exactly.
  3. Optionally turn on sensitive data detection or use Find & Redact, then review and confirm each result - nothing is applied automatically.
  4. Click Apply Redactions and confirm: the marked text is deleted from the file, not covered.
  5. Check the verification results and download your redacted PDF.

PDF Redaction vs Black Boxes

A black rectangle placed on a PDF is a drawing on top of the page; the original text remains inside the file and can be copied, searched or revealed with free tools in seconds. Real redaction modifies the document itself: the selected text runs are physically removed from the page's content stream, so nothing remains underneath the cover. This tool deletes the content first and only then draws the opaque rectangle, and it re-reads the finished file to verify that the redacted text is no longer extractable.

What Information Can You Redact?

  • Names, addresses and other personal identifiers
  • Social Security numbers and government ID numbers
  • Email addresses and phone numbers
  • Credit card, bank account and payment details
  • Dates of birth and patient or case reference numbers
  • IP addresses, URLs and internal file paths
  • Confidential clauses, figures and trade secrets
  • Legal, medical and financial records

Redacting Scanned PDFs

Scanned PDFs are photos of pages, so there is no selectable text - but the pixels still contain the sensitive content. Use Redact Area to draw boxes over them: marked pages of scanned documents are flattened into images with the redaction burned in, which removes the underlying picture data as well. If your scanner added an invisible OCR text layer, the redactor's text removal and sanitizing steps clear that too.

Common Use Cases

  • Share a contract without exposing prices, addresses or signatures
  • Release legal or court documents with party names blacked out permanently
  • Send a medical or lab report with patient identifiers removed
  • Publish a financial statement without client account numbers
  • Remove emails and phone numbers from invoices before forwarding them
  • Redact personal data in documents kept long-term or archived
  • Prepare government or compliance reports with classified sections removed
  • Strip hidden metadata, annotations and form data before publishing

Features

Real text removal

Marked text is deleted from the PDF content stream - not hidden under a rectangle.

Area redaction

Drag a box over any region, including scanned pages, images and vector graphics.

Smart detection

Finds emails, phone numbers, credit cards, SSNs, IPs, URLs, dates and account numbers - you confirm every hit.

Find & redact

Search a word and mark one occurrence or every match across all pages.

Local processing

The PDF is parsed and rewritten in your browser. Nothing is uploaded.

Permanent output

Redacted content cannot be selected, searched, copied or uncovered - and the tool verifies it claims.

Frequently Asked Questions

Is this PDF redaction tool free?▼
Yes. Redact PDF with Qudo is free to use, with no sign-up and no watermarks.
Is the redaction really permanent?▼
Yes. For text, the drawing instructions are deleted from the page's content stream; when a page cannot be edited surgically it is flattened into an image with the redaction burned in. The tool then re-reads the output to verify the redacted text is gone.
What is the difference between redaction and placing black rectangles?▼
A rectangle is just a drawing on top of the page - the text underneath stays selectable, searchable and extractable. Redaction deletes the underlying content itself, so removing the rectangle reveals nothing.
Can I undo a redaction after applying it?▼
Not inside the output file - that is the point of redaction. Before you click Apply you can undo freely, and the original file on your device is never modified, so keep a copy of it if you need one.
Does it remove PDF metadata too?▼
Yes. Applying redactions also clears document information (title, author, producer), page annotations and embedded metadata streams by default. Metadata is separate from visible text: if you only need metadata gone, deleting it without redaction is enough.
Can I redact a scanned PDF?▼
Yes. Scanned pages have no selectable text, so use area redaction: marked pages are re-rendered as images with the sensitive regions destroyed, not covered.
Are my files uploaded to a server?▼
No. All parsing, redaction and verification happen in your browser. Your PDF never leaves your device.
Can redacted information still be recovered?▼
The redacted output is rebuilt as a fresh file, so the removed content is not in it. Verification covers text that can be checked automatically; unusual constructions can defeat any tool, so review the output before sharing sensitive documents.
Can I redact multiple pages at once?▼
Yes. Marks can be placed on any page, and detection or Find & Redact can mark every match across the whole document in one step. Pages without marks are left untouched.
Is redaction with this tool legally compliant or HIPAA compliant?▼
Proper redaction (permanent removal) is what regulations require, and this tool implements it. However, no software can guarantee compliance for your specific obligations - for regulated documents, follow your internal procedures and keep records of what was released.