GSTIN Validator

Validate the mathematical structure of any 15-digit GSTIN (GST Number) online instantly. Decodes state code and PAN details.

Enter GSTIN Number

Status

Decoded GSTIN Info

State Code: -
PAN Card Number: -
Entity Number (13th Char): -

GST Number Format Validator - Verify GSTIN Structure Offline

Entering an incorrect GSTIN (GST Identification Number) on tax invoices can lead to rejection during GSTR returns and input tax credit matching. Our online GSTIN Validator checks the 15-digit GST number format to confirm it adheres to the official checksum layout.

The check decodes state codes and verifies the checksum character mathematically in your browser, protecting business privacy.

Key Reference & Specifications Table

GSTIN Digit PositionCharacter TypeSignificanceFormat Details
Digits 1-2NumericState Codee.g., 07 for Delhi, 27 for Maharashtra
Digits 3-12AlphanumericPAN Card NumberUnique identification of the entity
Digit 13NumericEntity NumberBased on registration count of PAN in State
Digit 14AlphabetZ (Constant)By default set to 'Z' for future use
Digit 15AlphanumericChecksum CharacterVerifies mathematical accuracy of GSTIN

How to Use the Online GSTIN Validator

  1. Locate the 15-digit GSTIN on the invoice or billing registry.
  2. Type the GST number in the validator input field.
  3. The system checks the 15-character length and format structure.
  4. Verify the identified state code and checksum validation message.

Frequently Asked Questions (FAQs)

Does this GSTIN Validator verify active GST status with the government portal?

No. This tool is an offline structure validator. It checks format patterns, length, and checksums to catch errors, but does not connect to the official tax portal, ensuring data privacy.

What is the length of a valid GSTIN?

A valid GSTIN consists of exactly 15 alphanumeric characters without spaces or symbols.

What do the first two digits of a GST number represent?

The first two digits represent the State Code as per the Indian Census 2011. For example, 07 represents Delhi, 09 is Uttar Pradesh, and 27 is Maharashtra.

How is the 15th digit of the GSTIN computed?

The 15th digit is a checksum character computed using Luhn's algorithm mod 36 based on the preceding 14 characters.

What is the constant character in a GSTIN?

The 14th character of a GSTIN is set to the default character 'Z' for all GST numbers in India.

Is it safe to validate GSTIN numbers on this site?

Yes. The validation script executes locally inside your web browser. We do not store or transmit your validated GSTINs.

What is the difference between GSTIN and GSN?

GSTIN is the unique tax registration number. HSN (Harmonized System of Nomenclature) is a code system used to classify goods for tax categorization.

Why is my GST number showing as invalid when I type it?

Check if you transposed characters or entered confusing letters (e.g. typing zero '0' instead of letter 'O', or vice versa).

Can I validate GSTIN for composition schemes?

Yes. All entities registered under GST (Regular or Composition) have the same 15-character structure.

How can I check if a GST number is active or cancelled?

To check active status, copy the GST number and run a query on the official GST Portal (services.gst.gov.in) under the 'Search Taxpayer' feature.