Two of the most common document security techniques — redaction and encryption — are frequently confused. They solve completely different problems. Using one when you need the other leaves dangerous gaps.

What Is Redaction?

Redaction permanently removes content from a document. It's the digital equivalent of blacking out text with a marker — except proper redaction actually deletes the underlying data, not just covers it.

What it protects against: Readers seeing sensitive content (names, account numbers, medical data) when viewing the document.

Use our PDF Redaction Tool to permanently remove sensitive information — not just visually hide it.

What Is Encryption?

Encryption scrambles the entire file using a cryptographic key. Without the password, the file is unreadable — but the content is still there, intact, just locked.

What it protects against: Unauthorized access to the file entirely — interception in transit, stolen devices, unauthorized access to storage.

Use our PDF Encryption Tool to add password protection to any document.

Key Differences

  • Redaction: removes content permanently | Encryption: locks the whole file
  • Redaction: document is still readable (minus redacted parts) | Encryption: document is completely unreadable without key
  • Redaction: use before sharing | Encryption: use before transmitting
  • Redaction: for compliance (GDPR, HIPAA) | Encryption: for access control

When to Use Both

For maximum security, combine both: first redact the sensitive portions of the document, then encrypt the entire file before sending. Also consider stripping metadata as a third layer.

FAQ

If I encrypt a PDF, do I still need to redact it?
Yes — if the recipient is authorized to open the file, they'll see everything inside including unredacted sensitive data. Encryption controls who can open the file; redaction controls what they see once open.
Is highlighting text in black the same as redacting?
No. Highlighting text with a black color box hides it visually but the underlying text remains extractable. Proper redaction — like our tool provides — actually deletes the content from the file structure.