Secure PDF redaction

Permanent PDF Redaction

Many popular PDF viewers provide 'highlighter' or 'shape' tools that give the illusion of redaction by placing a black box over text. If you distribute that file, anyone can select, copy, or delete the rectangle to reveal the private information underneath. Paperly executes true permanent redaction locally: the underlying data is destroyed and flattened before export, ensuring confidential information can never be recovered.

Paperly PDF editor tools for merging, splitting, and organizing pages

What it is

Permanent redaction is the irreversible sanitization of sensitive text, account numbers, personal identifiers, and images from a PDF. Rather than merely drawing a visual black box over characters (which leaves the underlying text stream readable, searchable, and copyable), Paperly completely expunges the underlying vector text, coordinates, and metadata from the document file structure.

When you reach for it

  • Blacking out Social Security Numbers (SSN), tax IDs, or passport details before filing
  • Sanitizing bank account numbers, routing codes, and payment info from statements
  • Redacting patient health information (PHI) for HIPAA compliance in medical forms
  • Protecting proprietary pricing, client names, or confidential terms in business contracts
  • Preparing court filings and discovery documents for public docket release

How Paperly does it

  1. 01

    Select areas for redaction

    Highlight text lines or drag rectangular boundary boxes over the names, account numbers, or photos you need to sanitize from the document.

  2. 02

    Purge underlying data

    Paperly irreversibly strips the selected text glyphs, font references, and bounding coordinates from the PDF's internal content stream.

  3. 03

    Export flattened, secure PDF

    A clean, newly compiled PDF is generated with solid black redaction blocks permanently burned into the page canvas. No recipient or inspection tool can reveal what was removed.

Questions people ask

Drawing a black box or using a black highlighter merely creates a new visual layer on top of your text. The underlying characters remain inside the PDF file and can be copied or exposed by deleting the box. Paperly's permanent redaction physically deletes the underlying text stream and metadata, making data extraction impossible.

No. Because Paperly completely removes the character streams and rasterizes the redacted regions, no raw text strings or hidden vector layers remain in the file syntax.

Yes. When exporting a redacted document, Paperly sanitizes internal PDF metadata fields—such as author name, software version, title, and edit timestamps—to prevent inadvertent information leaks.

Yes. Redaction is executed 100% locally on your iPhone or Windows PC. Your sensitive contracts, financial statements, and personal records are never uploaded to any remote server.

Related features

Try permanent redaction where it runs best.

Paperly for iPhone — private, on-device, and free to download.