Auto-Redact PII
Automatically detect and black out emails, phone numbers, and IDs.
- 100% Private
- No Limits
- Works Offline
or drag and drop here
Automatically detects and blacks out emails, Thai phone numbers, and Thai national/tax ID numbers. This is a best-effort scan, not a guarantee — review the result before sharing a sensitive document.
Scan a PDF for emails, Thai phone numbers, and Thai national/tax ID numbers, and black them out automatically — using the same true rasterize-and-rebuild redaction as the manual Redact PDF tool, so nothing selectable is left underneath.
How to Use Auto-Redact PII
- 1
Upload your PDF
Click the upload area or drag in the document you want scanned.
- 2
Scan and redact
The tool finds matching emails, phone numbers, and ID numbers and blacks them out.
- 3
Review and download
Check the redacted result before sharing it — automatic detection is a best effort, not a guarantee.
Why Choose PurePDF for Auto-Redact PII
Nothing leaves your device
Detection and redaction both run locally in your browser — your document is never uploaded.
Real redaction, not an overlay
Matched pages are rasterized with the redaction baked into the pixels — there's no text left underneath to copy or extract.
Built for Thai documents
Recognizes Thai mobile/landline number formats and the 13-digit Thai national/tax ID pattern, not just generic digit runs.
Common Use Cases for Auto-Redact PII
Sharing a scanned contract
Strip contact details and ID numbers before sending a document to someone outside your organization.
Publishing a redacted report
Remove personal identifiers from a report before posting it publicly.
Pre-screening before upload
Catch PII you forgot was in a document before it goes somewhere it shouldn't.
Pro Tips for Auto-Redact PII
- This is a best-effort scan — always review the result before sharing a sensitive document.
- Need to redact something the automatic scan missed (like a name or address)? Use Redact PDF to mark it manually.
- A page with no matches keeps its original content untouched — only pages with a detected match get rasterized.
Frequently Asked Questions About Auto-Redact PII
Will my PDF file be uploaded to a server?
No — nothing is uploaded. This tool runs entirely in your browser via WebAssembly/JavaScript; your file never leaves your device.
Is there a file-size limit, a usage cap, or a hidden fee?
It's free and unlimited, with no watermark and no forced file-size cap — the only real limit is your own device's memory for very large files.
Do I need to create an account or sign up?
No — no account, email, or sign-up is required for any tool. Just start using it.
Can I use this on my phone (iPhone or Android)?
Yes — it works in any modern mobile browser, no app install needed.
Can redacted text still be copied or selected after processing?
No. Pages with matches are rasterized with the black bars baked into the pixels, leaving no underlying text to copy or extract.
What kinds of personal data does this tool detect?
It is designed to detect email addresses, Thai mobile and landline numbers, and 13-digit Thai national or tax ID numbers.