Question 1

Why is PDFBlack redaction irreversible compared to standard PDF editors?

Accepted Answer

Many standard tools merely overlay a black box over text, allowing anyone to select, copy, or extract the underlying text. PDFBlack TrueRedact™ physically purges glyph drawing operators (Tj, TJ), re-encodes binary content streams, and destroys data at byte level, ensuring zero chance of recovery.

Question 2

Which sensitive data types does the automated pattern scanner detect?

Accepted Answer

The smart scanner searches for critical patterns: credit cards (with Luhn checksum validation for Visa, Mastercard, Amex), national identity numbers (DNI, NIE, SSN), corporate email addresses, phone numbers, and custom keyword queries.

Question 3

Does it strip hidden document metadata and invisible OCR layers?

Accepted Answer

Yes. Beyond purging visible page contents, PDFBlack sanitizes standard metadata dictionaries (Title, Author, Producer, Creation Date), wipes XMP XML metadata trees, and cleans hidden OCR text layers to prevent accidental leaks.

Question 4

What is the Forensic Chain of Custody Certificate?

Accepted Answer

Upon redaction, you can export an audit certificate featuring cryptographic SHA-256 hashes of the pre- and post-redaction documents, timestamps, engine specs, and patch logs. This provides legal compliance documentation for GDPR, HIPAA, and compliance audits.

Question 5

Can I redact scanned images, handwritten signatures, or photographs?

Accepted Answer

Yes. Using the manual rectangular bounding tool, you can select any graphical region (signatures, notarized stamps, face photos, logos, or barcodes). The engine renders and permanently burns the opaque patch over the image bytes.

Question 6

Is it safe to process court records or payroll documents on PDFBlack?

Accepted Answer

100% safe. PDFBlack is built on client-side browser execution. Your confidential files are parsed and sanitized purely inside your local RAM, with zero transmission to external servers or cloud storage.

Definitive Binary Redaction with Zero Data Leakage

Binary Purge & XMP Flush

Luhn Algorithm Forensic Audit

Stamping & Multi-Page Replication

Zero-Server Total Privacy

Frequently Asked Questions