YUCTS Tools

Personal Data Redaction for Text

Find and mask email addresses, phone numbers, card numbers, Japanese My Number, Taiwan IDs, IP addresses and URLs in text. Runs entirely in your browser; nothing is sent or saved.

  • Runs in your browser (no upload)

Paste text to find personal data that matches the selected rules and mask it. The text is processed only on this page — it is never sent or saved.

Rules to apply

Replace with

Labels such as [EMAIL] and [PHONE] are the same in every language. "Keep the last 4" only applies to values with at least 8 letters or digits; punctuation and separators stay as they are.

Automatic detection is not exhaustive. Names, addresses, birth dates and photos are not detected. Always review the result yourself before sharing it.

Results

9 item(s) found.

  • Email1
  • Phone2
  • Card1
  • My Number1
  • TW ID1
  • IP2
  • URL1

Preview of matches

Contact: Jane Doe (jane.doe@example.comEmail) Office +1 415 555 0123Phone / mobile +81 90-1234-5678Phone Card 4111 1111 1111 1111Card (test number) Japan My Number 1234 5678 9018My Number Taiwan ID A123456789TW ID Login from 192.0.2.10IP and 2001:db8::25IP Order details: https://example.com/orders/12345?ref=mailURL

How to use

  1. Paste the text you want to check (a fictional example is filled in at first).
  2. Choose the rules to apply and how matches are replaced: ●●●, a type label or the last 4 characters.
  3. Check the highlighted preview, then copy the masked text or save it as a text file.

FAQ

Is my text sent anywhere?

No. Detection and replacement run entirely in your browser; the text is never sent, saved or logged, and it is gone when you close the page.

How are card numbers and ID numbers recognized?

Card numbers must have 13–19 digits and pass the Luhn check, a My Number must have 12 digits with a matching check digit, and Taiwan ID or resident certificate numbers must match their checksum. The tool does not check whether a number really exists.

Does it handle full-width digits?

Yes. Full-width letters, digits and dashes are treated like their ASCII forms during detection, and the original characters are masked in place.

Will it find all personal data?

No. Names, addresses and birth dates are not detected, and numbers glued to other digits or letters or written in unusual formats can be missed. Always review the result before sharing it.

Notes & limitations

  • What you enter is processed only on this page and is not sent to YUCTS servers.
  • Detection uses patterns and checksums and is not exhaustive: names and addresses are out of scope, and both misses and false matches are possible.
  • Version numbers can look like IP addresses, and numbers whose check digit happens to match may be flagged as My Number or card numbers.
  • URLs are matched on their ASCII part only, so a URL containing other scripts may be masked only partially.
  • The text you enter is never sent, saved or logged.

Data sources