Korean utilities
Korean utilities for humans and AI.
Korea-specific tools as Web, API, and AI Tool.
- VAT split
Split a VAT-included or supply amount into supply, VAT, and total (KRW).
- Korean business day
Korean business days: check a date, add N business days, or count a range (public holidays 2018–2027).
- Business registration number
Validate a Korean 10-digit business registration number (checksum and type). No live NTS lookup.