How to Redact PDF Content
Redaction permanently removes sensitive information—Social Security numbers, financial details, medical records, confidential names—from a PDF so it cannot be recovered. Unlike drawing a black box over text, proper redaction deletes the underlying data entirely. This is legally required for FOIA responses, court filings, and HIPAA compliance. SublimePDF performs true redaction that erases content from the file, not just covers it visually.
Follow the step-by-step instructions below, then use the free tool directly — no registration or download required.
Open Tool →How to Redact PDF Content — Step by Step
Upload your PDF
Open the Redact PDF tool and upload the document containing sensitive information. The tool opens in a secure editor where you can identify and mark content for permanent removal.
Mark content for redaction
Click and drag to draw redaction boxes over text, images, or entire regions you want to remove. The marked areas are highlighted in red to indicate they're queued for redaction but not yet permanently removed.
Use search-and-redact for recurring content
Enter a pattern (like a Social Security number format, phone number, or specific name) in the search field. The tool finds and marks all occurrences across every page, ensuring nothing is missed.
Set redaction appearance
Choose the appearance of redacted areas: solid black (standard for legal documents), solid white (less visible), or a custom color. Optionally overlay replacement text like 'REDACTED' or 'CONFIDENTIAL' on each redaction mark.
Apply redactions permanently
Click 'Apply Redactions' to permanently erase all marked content from the file. This is irreversible—the underlying text, images, and metadata in redacted areas are deleted from the PDF data. Download the redacted document.
Pro Tips
- 💡 Always work from a copy of the original document. Once redactions are applied, the content is permanently and irreversibly destroyed in the output file.
- 💡 Use the search-and-redact feature for Social Security numbers, phone numbers, and email addresses—it catches occurrences you might miss when scanning visually.
- 💡 Redact metadata too: go to the Metadata panel and clear author name, creation software, and revision history if they contain sensitive information.
- 💡 For legal filings, use black redaction boxes with 'REDACTED' overlay text—this is the standard expected by most courts and government agencies.
Privacy & Security
All processing happens directly in your browser. Your files are never uploaded to any server — they remain on your device throughout the entire process. SublimePDF uses WebAssembly technology for fast, secure, client-side processing.
Works Everywhere
This tool works on any modern browser — Chrome, Firefox, Safari, or Edge — on desktop, tablet, or mobile. No software to install. PDF is an open ISO standard supported by all major platforms.
How to Redact PDF Content — FAQ
Is SublimePDF redaction true redaction or just visual overlay?
Can I redact the same information across hundreds of pages?
Does redaction remove hidden metadata too?
What's the difference between redaction and deleting text?
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