Developer Tools
Korean SSN Decoder
Decode a Korean resident registration number (주민등록번호). Verify checksum, extract birth date, gender, and nationality info.
Input
This tool does not store or transmit any data. All processing is done on the server without logging.
Result
Analysis result will appear here.
Related Tools
Chmod Calculator
Calculate Unix file permissions visually. Click checkboxes to set read/write/execute for owner, group, and others. Shows octal and symbolic notation.
CSS Specificity Calculator
Calculate CSS selector specificity and understand which styles take precedence. Supports ID, class, attribute, pseudo-class, element, and pseudo-element selectors.
CSS Unit Converter
Convert between CSS units: px, rem, em, pt, vw, vh. Set custom base font size and viewport width.