Text Masker
Mask sensitive information in text โ phone numbers, email addresses, ID numbers, bank cards. Protect privacy with one click. Free online tool.
Frequently Asked Questions
What is data masking?
Data masking (also called data redaction or data obfuscation) is the process of replacing sensitive information with masked characters (like asterisks) to protect privacy. For example, a phone number 13812345678 becomes 138****5678, and an email john.doe@example.com becomes j***@example.com.
What types of sensitive data can this tool mask?
The tool can mask: phone numbers (various international formats), email addresses, credit card numbers (16-19 digits), US Social Security Numbers (SSN in XXX-XX-XXXX format), Chinese ID card numbers (18 digits), and IPv4 addresses. You can selectively enable which types to mask.
How are phone numbers masked?
Phone numbers are detected using international patterns (with or without country code). The first 3 digits and last 4 digits are preserved, with the middle digits replaced by asterisks. For example: 13812345678 โ 138****5678, +1-555-123-4567 โ +1-5*********4567.
How are credit card numbers masked?
Credit card numbers (16-19 digit sequences) are masked to show only the last 4 digits. For example: 4532015112830366 โ ************0366. This follows PCI DSS compliance standards for displaying partial card numbers.
Is my data safe?
Yes, all masking happens entirely in your browser using JavaScript. Your text is never uploaded to any server. This makes it safe to use with real sensitive data โ nothing leaves your device.
Can masking be reversed?
No, masking is a one-way process โ the original sensitive data is replaced with asterisks and cannot be recovered from the masked output. If you need to keep the original, make sure to save a copy before masking.