GST Number Validator

Validate up to 100 GST numbers at once using the official check-digit algorithm. Secure, fast, and local.

Enter GST Numbers (comma or line separated)

0 / 100 entries

How it works

Structure Check

A GSTIN is a 15-character string. The first 2 digits are the state code, followed by a 10-char PAN, an entity code, 'Z' default, and a check digit.

Checksum Logic

The last character is a check digit calculated using a Modulo 36 algorithm based on the other 14 characters. This tool verifies that mathematical relationship.

Privacy First

No data is sent to any server. Validation happens locally in your browser using JavaScript.