Canadian · Validation

Canadian SIN validator.

Validate a Social Insurance Number against the Luhn check digit. Everything runs in your browser — no SIN ever leaves your device.

Inputs

Result

Enter a SIN and press Validate.

How SIN validation works

A SIN is a nine-digit identifier issued by Service Canada. Validity is checked with the Luhn algorithm — the same checksum used for credit cards. Doubling every second digit from the right, summing the parts, and checking that the total is divisible by 10 confirms the SIN is mathematically well-formed.

First-digit meaning

1–7: regular SIN (citizens, permanent residents).
9: temporary SIN (work or study permit holders); expires with the underlying permit.
0 and 8: not currently issued.

Privacy

This tool runs entirely in your browser. Nothing you type is transmitted, stored, or logged. Use it freely on shared devices.