Personal Info Masking
Before sharing customer lists, call notes or emails, find and mask Korean resident and alien registration numbers, phone numbers, email addresses and account numbers. Choose partial masking (keep a few characters) or full masking; masked spots are highlighted. Your text never leaves this browser.
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When to use it
Share call notes safely
010-1234-5678 becomes 010-****-5678 and 900101-1234567 becomes 900101-1******. Copy the result or save it as TXT.
Use emails as examples
Email addresses keep only the first two characters (ab****@example.com), or only @ and dots in full mode.
Send text that contains bank details
Hyphenated 10-16 digit numbers, or digits after a word like 계좌 (account), are treated as account numbers and only the last 4 digits are kept.
How to use
- Paste the text.
- Choose which types to find, the masking style and the mask character.
- Check the highlighted result, then copy it or save it as TXT.
What it finds
- Registration numbers: 13 digits whose first six are a real date and whose seventh is 1-8, with or without a hyphen.
- Phone numbers: Korean mobile numbers (010, 011, 016-019) and area-code, 070 and 050 numbers.
- Emails: Anything shaped like name@domain.
- Account numbers (guess): Hyphenated numbers with 10-16 digits, or 10-16 digits after 계좌 / account. Business registration numbers (000-00-00000) and dates are skipped.
Frequently asked questions
Does it hide names or addresses?
No. It only finds items with a recognisable shape. Remove names, addresses and text in images yourself.
Can other numbers be masked by mistake?
Yes, numbers shaped like account numbers may be masked, and numbers split by spaces may be missed. Always check the result.
Can I undo the masking?
No. The result keeps no trace of the original, so keep your original text separately.
Is my text uploaded?
No. Finding and masking happen on this page only.
Last checked: October 24, 2026 · Dagochim team