Text Anonymizer

Automatically detect and mask national ID numbers, phone numbers, emails, IBANs, and credit card numbers in your text.

Runs 100% in your browser — the sensitive text you enter is never sent to a server or stored anywhere.
Types to mask:

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Frequently Asked Questions

No. Masking happens entirely in your browser using regular expressions; the text you enter is never sent to or saved on a server.

It leaves only the last 4 digits of the number visible and masks the rest with asterisks (useful when you want to reference an IBAN or card number by its last digits).

The patterns (regex) work based on common formats; unusual formats (different spacing or separators) may be missed. Review the output before sharing sensitive documents.

No. This tool is a masking/redaction tool; it does not guarantee irreversible "anonymization" in the legal sense. In particular, with the "partial" masking style the last 4 digits remain visible, so if you need full anonymity, remove the information entirely instead.

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