Redaction That Can’t Be Undone

Redact PDFs safely and reliably with no residual data. Instead of masking content, Pdftools builds a new PDF without sensitive information. True redaction can’t be reversed and is compliant for heavily regulated industries.

Manual and AI-supported redaction

AI Smart Redact

AI-powered redaction with human-in-the-loop

The AI detection engine identifies sensitive information in a PDF. After review by a user, anything marked for redaction is removed, leaving no residual data behind.

  • Faster detection with up to 98% accuracy

  • True redaction with no trace left behind

  • Append-only audit trail for compliance and troubleshooting

Perform AI-powered redaction with AI Smart Redact

AI-powered redaction with human-in-the-loop
PDF Viewer SDK

Manual PDF redaction for high-stakes documents

Send a document to the PDF Viewer for manual redaction to completely remove sensitive data—no residual data, no hidden elements.

  • Highlight elements to mark them for redaction

  • Sensitive elements are removed, not masked

  • PDF is rebuilt from scratch, content is not recoverable

Experience manual redaction with the Pdftools PDF Viewer

Manual PDF redaction for high-stakes documents
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What is true redaction?

PDFs contain more than what you see. Metadata, fonts, tags, and revision history all live beneath the visible content, but most tools don’t touch them. True redaction also removes sensitive data you can’t see.

Masking doesn’t get rid of hidden data

Masking doesn’t get rid of hidden data

PDFs contain hidden data: metadata, fonts, digital signatures, tags that structure content, and more. Even a document’s history could be saved in a layer, potentially revealing previously deleted content.

Many PDF redaction software just masks the visible information in the top-level content stream. Any sensitive information underneath it can still be accessed with a bit of skill, undoing redaction.

Properly redacted data can't be restored

Properly redacted data can’t be restored

Rather than overlaying or deleting content, the Pdftools redaction method completely rebuilds the PDF, copying over only what is visible after marking for redaction. Unnecessary data is discarded.

Our redaction method completely removes any Personally Identifiable Information (PII) present in the original document. This ensures that no residual data is left behind.

Read “The Hidden Layers of PDF Redaction” to learn more

Faster and smarter PDF redaction with AI

We combine true redaction with an AI-based detection method. A human-in-the-loop component ensures nothing is redacted without explicit approval. The AI handles detection; the use focuses on decision-making.

No genAI, no hallucinations

The detection engine pairs a Named Entity Recognition (NER) model with regular expressions for fine-tuning.

NER extracts information by classifying named entities (people, places, etc.) and is non-generative, which prevents hallucinations and unpredictability; compliance is assured. NER also requires fewer resources and is faster than generative AI. The deterministic part of the engine then fine-tunes detection using regex.

The end user has to review any redaction suggestions before redaction can be applied, so the final decision is always made by a human. The document is then recreated without sensitive data.

No genAI, no hallucinations

Made for secure deployment

Pdftools redaction is self-hosted and deployable in fully air-gapped environments, giving you complete control over data security.

Air-gapped deployment

Air-gapped deployment

Redaction can be deployed in fully air-gapped environments for the most high-risk documents in compliance-heavy industries

Fully encrypted

Fully encrypted

Files are encrypted at rest with a per-file key and not cached when the job is done

Crypto-erasure

Crypto-erasure

Deleting a token renders the underlying file cryptographically unrecoverable

Do you need fast redaction with human oversight?

Find out how our redaction tooling fits into your pipeline.

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