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Data masking (also known as data obfuscation or data anonymization) is the process of hiding or replacing sensitive data with placeholder characters such as asterisks (*). It protects personal information like phone numbers, email addresses, ID card numbers, and credit card numbers while maintaining the data format for display or testing purposes.

Select a masking type (Phone, Email, ID Card, Credit Card, Bank Card, Name, Address, or Custom), then enter the data you want to mask — one item per line. Click the Mask button to process. The tool will detect matching patterns and replace the sensitive portions with asterisks. You can load sample data by clicking the Example button.

Phone: Masks the middle 4 digits of phone numbers (e.g., 138****5678). Email: Keeps the first 2 characters and masks the rest before the @ symbol (e.g., zh***@example.com). ID Card: Masks the middle portion of ID numbers (e.g., 110101********1234). Credit Card: Shows only the last 4 digits (e.g., **** **** **** 0001). Bank Card: Shows only the last 4 digits (e.g., **********0123). Name: Keeps the first and last characters for longer names (e.g., Z***g). Address: Keeps roughly 30% at the start and 20% at the end. Custom: Define your own regex pattern and replacement string.

For advanced use cases, select the Custom type and provide a JavaScript-compatible regular expression pattern and replacement string. The replacement supports capture groups using $1, $2, etc. For example, pattern (\d{3})\d+(\d{3}) with replacement $1****$2 will keep the first and last 3 digits while masking the middle.