GSTIN stands for Goods and Services Tax Identification Number. It is a 15-character alphanumeric code assigned to every GST-registered business in India.

What is the structure of a GSTIN?

A GSTIN consists of: 2-digit state code + 10-character PAN + 1-digit entity number (1–9 or A–Z) + the letter Z + 1 checksum character.

What do the first 2 digits of GSTIN represent?

The first 2 digits are the state code. For example, 07 = Delhi, 27 = Maharashtra, 29 = Karnataka. There are 37 state/UT codes covering all Indian states and union territories.

Is the checksum validation accurate?

Yes. This tool implements the official mod-36 Luhn-style checksum algorithm used by the GST authority to verify GSTIN authenticity.

What does the 13th character of GSTIN mean?

The 13th character is the entity number, indicating how many GST registrations a business has in the same state under the same PAN. The first registration is 1, the second is 2, and so on up to 9, then A–Z.

Why is the 14th character always Z?

The 14th character is always Z by default in the current GST system. It is reserved for future use and currently serves as a fixed identifier.

Can a PAN holder have multiple GSTINs?

Yes. A business operating in multiple states must register separately in each state, getting a unique GSTIN per state. The entity number (13th character) also allows multiple registrations in the same state.

Is my GSTIN data safe?

Completely safe. All validation happens in your browser using JavaScript. No data is transmitted to any server.

What should I do if my GSTIN fails checksum but seems correct?

A checksum failure may indicate a transcription error. Double-check the GSTIN from your GST registration certificate. If the issue persists, verify it on the official GST portal at gst.gov.in.

GSTIN Validator

Check if a GST number (GSTIN) is valid and decode state, PAN and entity details.

Enter GSTIN

0/15

ST+AAAAA0000A+E+Z+CState·PAN·Entity·Z·Check

All Indian State / UT Codes

10Bihar

11Sikkim

12Arunachal Pradesh

13Nagaland

14Manipur

15Mizoram

16Tripura

17Meghalaya

18Assam

19West Bengal

20Jharkhand

21Odisha

22Chhattisgarh

23Madhya Pradesh

24Gujarat

25Daman & Diu

26Dadra & Nagar Haveli

27Maharashtra

28Andhra Pradesh (Old)

29Karnataka

30Goa

31Lakshadweep

32Kerala

33Tamil Nadu

34Puducherry

35Andaman & Nicobar Islands

36Telangana

37Andhra Pradesh

01Jammu & Kashmir

02Himachal Pradesh

03Punjab

04Chandigarh

05Uttarakhand

06Haryana

07Delhi

08Rajasthan

09Uttar Pradesh

Disclaimer: Validates GSTIN format and checksum only. Does not connect to the GST portal or verify active registration status. For official verification, use the GST portal at gst.gov.in.

GSTIN Validator का उपयोग कैसे करें

1
Enter the 15-character GSTIN in the input field.
2
The tool validates the format using the official GSTIN regex pattern.
3
The state is automatically decoded from the first 2 digits.
4
The embedded PAN (characters 3–12) is extracted and displayed.
5
The entity registration number and checksum character are shown.
6
A mod-36 checksum algorithm verifies the final character.
7
Green badge = valid; Red badge = invalid with reason shown.

GSTIN Validator के बारे में

Need to verify a GSTIN before processing a transaction? The GSTIN Validator checks the format, decodes the state code, extracts the embedded PAN, identifies the entity number, and verifies the mod-36 checksum — all instantly in your browser.

What Gets Validated

Format check — verifies the 15-character alphanumeric pattern (2-digit state + 10-char PAN + entity + Z + checksum)
State decode — maps the first 2 digits to all 37 Indian states and union territories
PAN extraction — shows the 10-character PAN embedded in characters 3–12
Entity number — identifies which GST registration this is under the same PAN and state
Checksum verification — implements the official mod-36 Luhn-style algorithm used by the GST authority

Visual Breakdown

The tool displays a color-coded visual breakdown of each GSTIN segment, making it easy to understand the structure. A reference table of all 37 state/UT codes is also included for quick lookup.

Note: This tool performs offline format and checksum validation only. It does not connect to the GST portal. For official registration status, visit gst.gov.in.