GST Number Verifier — Validate 15-Digit GSTIN Format Online (Free)
Last updated: 2026-05-02
The GST Identification Number (GSTIN) is a 15-digit unique code assigned to every registered business in India. Our GST Number Verifier helps you ensure that a GSTIN is structurally correct. It automatically identifies the State Code and verifies the embedded PAN card number within the GSTIN.
Verification is done locally in your browser to maintain 100% privacy. We never store or transmit the GST numbers you enter. This tool is perfect for business owners, accountants, and auditors who want to verify the format of GST numbers on invoices before filing returns or claiming Input Tax Credit (ITC).
Understanding GSTIN Structure
A GSTIN is a 15-digit alphanumeric identifier that carries significant information about the taxpayer:
| Digits | Components | Description |
|---|---|---|
| 1-2 | State Code | Based on 2011 Census (e.g., 07 for Delhi, 27 for Maharashtra). |
| 3-12 | PAN Number | The Permanent Account Number of the entity. |
| 13 | Entity Number | Number of registrations under the same PAN in the state. |
| 14 | Default 'Z' | Always 'Z' for all GST numbers. |
| 15 | Checksum | Check digit used to catch transcription errors. |
Why Correct GSTIN is Critical
Under the Indian GST regime, the Input Tax Credit (ITC) can only be claimed if the supplier's GSTIN is correctly mentioned in your purchase invoices and matched in the GST portal (GSTR-2B). Even a single character error can lead to a mismatch, resulting in the rejection of your tax credit.
Using this tool, you can instantly verify if the GSTIN provided by your supplier is structurally sound. If it fails our validator, it means the number is invalid and should be corrected before any business transaction takes place.
Frequently Asked Questions (FAQ)
Disclaimer: This tool validates the format only. It is not affiliated with GSTN or the Government of India.