Redact a document
Hiding text with black boxes in a PDF is not enough. Learn how to actually remove sensitive content.
Share documents that contain sensitive information while keeping that information hidden.
Use a proper redaction tool and verify the final exported file does not contain hidden layers.
Recommended path
Best first move: Use a proper redaction tool and verify the final exported file does not contain hidden layers.
- 1
Make a copy
Work on a copy and keep the original in a safe place.
- 2
Redact permanently
Use a tool that replaces text with blank pixels and flattens the document.
- 3
Remove metadata
Strip author, edit history, and comments from the file properties.
- 4
Verify by reopening
Open the exported file in a different reader and try selecting hidden text.
Best tools for this
Blackout text in documents.
Use proper redaction before exporting; do not just draw black boxes.
Stripping metadata from photos and documents.
Removes location, device, and timestamps before sharing.
Warnings
Do not use drawing tools
Black rectangles in Word or Preview can be removed by the recipient.
Comments and tracked changes leak
Accept all changes and delete comments before sharing.
Limitations
OCR can reconstruct some redactions
If the layout is known, redacted words can sometimes be guessed.
File formats matter
Export to a flattened format like print-to-PDF to reduce hidden layers.
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