I've anonymized five datasets this year and each time someone later asked for 'just one more field' which risked re-id…
Open the PDF you want to redact in Adobe Acrobat Pro.
Go to Tools and select Redact.
Click Find and Remove Text.
Enter the word, phrase, or pattern you want to search for in the search box.
Choose the location to search (e.g., current document or all PDFs in a folder), then click Search.
Review the search results and check all instances you want to redact, or use Select All to mark every occurrence.
Click Mark for Redaction to mark the selected instances.
Click Apply Redactions and confirm when prompted to permanently remove the marked content.
CautionRedactions are permanent and cannot be undone after saving.
Best practiceYou can customize the appearance of redaction marks before applying them by adjusting settings in the Redact tool.
Best practiceAlways double-check your search term and results to ensure all sensitive information is covered, especially with patterns like SSNs.
Save the redacted PDF with a new file name.
You can use the Find Text and Redact feature to quickly locate and mark all instances of sensitive words or patterns for redaction throughout your document.
This runs in the Acrobat app - there is no separate API for this task.
Redaction is a special tool in Acrobat Pro that permanently removes the selected content from the document. It deletes the text or image data. Drawing a black box, however, only covers the content visually. The original text or image data remains underneath and can be easily copied and pasted, making it visible again. Always use the Redaction tool for sensitive information.
Sanitizing a PDF after redaction is important because redaction only removes visible content. Hidden data, like metadata, comments, layers, and revision history, can still exist in the file. This hidden data might contain sensitive information that was not visibly redacted. Sanitizing ensures all non-visible sensitive information is also removed.
For large documents with many instances of Personally Identifiable Information (PII) like SSNs, the best way is to use Acrobat's pattern-based auto-redaction feature. This allows you to search for specific patterns (like SSN formats) and redact them all at once. After auto-redaction, it's a good practice to have a colleague review a random sample of the document to ensure accuracy and completeness.
Redaction in Adobe Acrobat Pro is a tool that lets you permanently remove sensitive text, images, or graphics from a PDF document. It replaces the selected content with black boxes, making the information unreadable and unrecoverable. This is used to protect privacy or confidentiality before sharing documents.