Auto Redact PDF
Automatically detect and redact sensitive information.
Quick Answer
How to Redact a PDF Automatically
Upload your PDF, pick what to redact — emails, phone numbers, SSNs, credit cards — and download a permanently redacted copy.
- Upload the PDF you want to redact.
- Choose which sensitive patterns to detect (emails, phone numbers, SSNs, credit card numbers), or add a custom pattern.
- Click redact — your browser finds and permanently blacks out every match, then downloads the result.
Drag & drop files here, or click to select
How to Auto Redact PDF Online
Upload your PDF document from your device.
Specify the redacting rules (such as email formats, card details, or custom words).
Check the preview highlights to review matches.
Click the Auto Redact button to mask matches and download.
Why Use SonuPDF to Redact PDFs?
Automated Overlay Masking
Automatically locate matching sensitive text patterns and overlay redact blocks in seconds.
Client-Side Privacy Sandbox
The redaction engine operates fully within your browser sandbox. Your document text and matching patterns never touch a cloud server.
Smart Format Templates
Built-in options to immediately identify emails, tax IDs, credit card numbers, and phone formats.
Custom Keyphrase Rules
Enter custom word lists or matching templates to ensure any proprietary info is covered.
Frequently Asked Questions
Yes. In contrast to simple black highlighter annotations that can be removed to expose underlying text, our engine fully deletes the matching text elements from the PDF structure.
No, the scanning and replacement process runs locally. Your private files are processed in-browser.
Yes, the page preview highlights matching text areas so you can review what will be permanently removed.
This tool is designed for searchable PDF text structures. For scanned image PDFs, text recognition (OCR) or manual redaction is recommended first.