ID Number Explained

How the South African 13-digit ID number works — what each digit means, the Luhn checksum, format validation, and the difference between ID validation and identity verification.

South African ID Number Format Explained: What Every Digit Means

March 26, 2026

Every South African carries a 13-digit identity number — on their green ID book, smart ID card, or just memorised from years of filling in forms. But most people have […]