GSTIN / PAN / TAN / CIN Validator

Instantly verify the format of Indian business registration numbers. 100% offline — no data is sent to any server.

Select Number Type

GSTIN Number

Goods & Services Tax Identification Number (15 characters)

Enter a GSTIN number to validate

About GSTIN validation

A GSTIN is the 15-character identifier every GST-registered business in India receives. Checking a supplier or customer GSTIN before you raise an invoice or claim input tax credit helps you avoid rejected returns and blocked credit. This validator checks the format and the check digit instantly, so you can catch typing errors before they reach your books.

How to use it

Enter or paste the 15-character GSTIN.
The tool checks the length, the state code, the embedded PAN pattern and the final check character.
Read the result. A valid format means the number is structurally correct.
If it is invalid, re-check the number against the original invoice or certificate.

Tips

Know how a GSTIN is built. The first two digits are the state code, the next ten are the holder PAN, the thirteenth is the number of registrations under that PAN in the state, the fourteenth is normally Z, and the last is a check character.
A valid format is not proof of an active registration. This tool confirms the number is well formed. To confirm the registration is active, look the GSTIN up on the official GST portal.
Validate at the point of entry. Checking GSTINs when you create a party in your accounting software prevents mismatches with GSTR-2B later.

Frequently asked questions

What does a GSTIN look like?: Fifteen characters, for example 29ABCDE1234F1Z5: state code, PAN, entity number, the letter Z, and a check digit.
Does this tool check if the GSTIN is active?: No. It validates the structure and check digit only. Use the GST portal to confirm the current status.
Is the GSTIN validator free?: Yes, free with no signup and no limit on checks.
Why does my GSTIN fail validation?: The usual causes are a mistyped character, a missing character, or an O typed instead of a zero. Compare it with the registration certificate.