Is the SSN masker free?

Yes, completely free with no signup and no usage limits.

Does my SSN leave my device?

No. All masking runs in JavaScript inside your browser. Nothing is sent to any server.

Does it work on mobile?

Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

SSN Masker

Mask US Social Security Numbers showing only the last 4 digits. Outputs standard dashes, X-replaced, and last-4-only formats — safe for display and logging.

100% client-side · no upload

Input

Output

How to use

Enter a SSN in XXX-XX-XXXX or plain 9-digit format.
Click Mask — three masked variants appear: standard dashes, X-replaced digits, and last-4-only.
Use the appropriate format for your display or logging need.

Related tools

Credit Card Formatter
Phone Number Formatter
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IBAN Validator

More ways to use this tool

Social Security Number Masker
SSN Redaction Tool

Frequently Asked Questions

Is the SSN masker free?: Yes, completely free with no signup and no usage limits.
Does my SSN leave my device?: No. All masking runs in JavaScript inside your browser. Nothing is sent to any server.
Does it work on mobile?: Yes. The tool is mobile-first and works on iPhone Safari and Android Chrome.

Last updated: 2026-05-20 By jarvisbox