Redact PDF

What it does

PDF redaction is the process of permanently removing sensitive content (names, SSNs, financial data, classified text) before sharing a document publicly or with unauthorized parties. The critical distinction: drawing a black rectangle on top of text in a normal PDF editor obscures it visually but the underlying text remains in the file — anyone can select-copy-paste it OR use a PDF parser to extract it. Real redaction MUST remove the text from the document data, not just cover it visually. High-profile embarrassments include Manafort/Mueller court filings (2019), Trump White House documents, and several corporate cases where “redacted” PDFs were actually leaking the redacted text.

The tool draws redaction rectangles AND flattens the result — converting the entire page to an image so any underlying text becomes part of the image rather than extractable PDF text. After flattening, the redacted regions are genuinely opaque and can't be reverse-extracted. Use cases: legal filings, FOIA responses, medical records (HIPAA-compliant redaction), corporate due-diligence documents, government documents with classified portions, witness statements where names need protection. All processing happens in your browser — the file with sensitive data never uploads.

Best practices for trustworthy redaction: (1) NEVER trust black-rectangle annotations alone — they're cosmetic, not real redaction. Always flatten to image. (2) Verify by attempting to copy-paste from redacted regions in the output PDF — should produce nothing or only the rest of the text. (3) Strip metadata after redaction — author name, edit history, revision notes can leak. Use ExifTool or Adobe's “Sanitize Document” feature. (4) For high-stakes redaction (legal, intelligence), use Adobe Acrobat Pro's dedicated “Redact” tool which does proper text-content removal, then sanitize. (5) Watermarks / page metadata — these often survive redaction and can identify document source. (6) Image-based PDFs (scans): redaction is just drawing over pixels; easier to verify but OCR can sometimes recover faintly-redacted content. Use fully-opaque rectangles, not transparency. (7) For the truly paranoid: print → re-scan creates a totally clean image-PDF with no recoverable hidden data.

How to use it

1. Drop your PDF or click to browse.
2. Draw black rectangles over sensitive text / images.
3. Click Apply — the tool flattens the result so redacted areas are truly opaque.
4. Verify by trying to copy-paste from redacted regions in the output (should produce nothing).
5. Strip metadata separately if needed (author, edit history can leak).

When to use this tool

• Legal filings with sealed information that needs partial public disclosure.
• FOIA / public records responses requiring redaction of personal info.
• Medical records where PHI must be removed before sharing (HIPAA).
• Corporate due-diligence sharing (financial / proprietary info masked).
• Witness statements / testimonies where names need protection.

When not to use it

• Highest-stakes redaction (intelligence, top-secret) — use specialized tools with audited redaction algorithms.
• Documents requiring HIPAA-certified redaction tools — confirm compliance with healthcare-grade redaction software.
• When you need to preserve text-search on non-redacted parts — flattening removes search; consider Adobe Pro's text-removal redact.
• Live documents being edited collaboratively — redact final version only.

Common use cases

• Verifying a number or output before passing it on
• Quick use during a typical workday
• Pre-decision sanity-check on inputs and outputs
• Educational use — demonstrating the underlying concept