GSTIN Validator
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Free GSTIN Format Validator for Indian Businesses

GSTIN Validator Check Structure Instantly

Validate GSTIN format and checksum, then fetch live taxpayer details — legal name, status, address, and more. Free and built for Indian businesses.

100% FreeNo Login RequiredInstant ResultsLive Taxpayer LookupChecksum Verified
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Privacy first Format & checksum
1Enter GSTIN

Paste freely — spaces and hyphens are cleaned automatically.

0 / 15
2View results

Enter a GSTIN to validate

Check format, state code, PAN structure, entity type, and checksum instantly.

What is a GSTIN Validator?

A GSTIN validator checks whether a Goods and Services Tax Identification Number follows the expected 15-character structure. It decodes the state code, embedded PAN, entity type from the 4th character of the PAN, registration sequence, reserved character, and checksum — so you can catch typing errors before they hit invoices, masters, or returns.

How to use this validator

1

Enter or paste a GSTIN

Spaces and hyphens are cleaned up and letters are uppercased automatically.

2

Review structure checks

See state code, PAN, sequence, reserved Z, and checksum segments update as you type.

3

Get live taxpayer details

When the format is valid, we fetch legal name, status, address, and more from the registry lookup.

GSTIN format at a glance

Every standard GSTIN is exactly 15 characters. Understanding each segment helps you spot entry mistakes faster.

Positions 1–2

State / UT code

Two digits from the official GST jurisdiction list

27 → Maharashtra

Positions 3–12

PAN

5 letters + 4 digits + 1 letter

AAPFU0939F

Positions 13

Registration sequence

Alphanumeric entity sequence under that PAN in the state

1

Positions 14

Reserved character

Must be Z for a standard GSTIN

Z

Positions 15

Checksum

Base-36 check character over positions 1–14

V

Entity reference

Entity Type from GSTIN — The 4th Character of PAN

Entity type is derived from the 4th character of the embedded PAN (GSTIN position 6). Decoded from structure only — not constitution verified from a live registry.

PIndividual / Proprietorship
CPrivate or Public Company
HHindu Undivided Family (HUF)
FPartnership Firm
AAssociation of Persons (AOP)
TTrust
BBody of Individuals
LLimited Liability Partnership
JArtificial Juridical Person
GGovernment Entity

State & jurisdiction codes

Recognized codes only. A match means the code is known — not that the taxpayer is registered in that state.

CodeNameType
01Jammu and Kashmirunion territory
02Himachal Pradeshstate
03Punjabstate
04Chandigarhunion territory
05Uttarakhandstate
06Haryanastate
07Delhiunion territory
08Rajasthanstate
09Uttar Pradeshstate
10Biharstate
11Sikkimstate
12Arunachal Pradeshstate
13Nagalandstate
14Manipurstate
15Mizoramstate
16Tripurastate
17Meghalayastate
18Assamstate
19West Bengalstate
20Jharkhandstate
21Odishastate
22Chhattisgarhstate
23Madhya Pradeshstate
24Gujaratstate
26Dadra and Nagar Haveli and Daman and Diuunion territory
27Maharashtrastate
29Karnatakastate
30Goastate
31Lakshadweepunion territory
32Keralastate
33Tamil Nadustate
34Puducherryunion territory
35Andaman and Nicobar Islandsunion territory
36Telanganastate
37Andhra Pradeshstate
38Ladakhunion territory
97Other Territoryspecial
99Centre Jurisdictionspecial

Who uses this tool

Customer onboarding

Validate GSTIN structure before saving a customer master or quoting GST rates.

Supplier / vendor setup

Catch mistyped supplier GSTINs during purchase onboarding.

Invoice preparation

Double-check B2B party GSTINs before generating tax invoices.

E-way bill & e-invoice

Reduce rejections caused by malformed GSTIN fields.

Accountant diagnostics

Explain why a GSTIN fails length, PAN, or checksum rules.

Data import cleanup

Spot structural issues before bulk customer or vendor imports.

Why T7ERP GSTIN Validator?

Built for real GST data-entry checks

Fast structural validation with transparent diagnostics — and language that never pretends format success is portal verification.

Runs fully in your browser

No login, CAPTCHA, or server upload of the GSTIN you type.

Honest Phase 1 language

We confirm structural validity and checksum — not active registration.

Character-level diagnostics

Failed rules highlight which segment or position needs correction.

Decoded details

See state, PAN, entity type, sequence, reserved character, and checksum.

Sample GSTIN to learn

Load a documented example and explore how each segment works.

Built for Indian SMBs

Designed alongside T7 ERP invoicing, masters, and GST workflows.

Live lookup

Live taxpayer details — available in the tool

When a GSTIN passes structure and checksum checks, we look up registry details such as legal name, trade name, status, constitution, addresses, and jurisdictions. Always reconfirm critical decisions on the official GST portal.

Included

Legal business name

Included

Trade name

Included

Registration status

Included

Taxpayer type

Included

Constitution of business

Included

Registration date

Included

Principal place of business

Included

Jurisdiction

Powered by T7ERP

Ready for complete business operations?

Validate GSTIN format free here, then keep customer and supplier GSTINs, invoices, and returns consistent inside T7ERP. T7ERP connects invoices, quotations, purchase orders, delivery challans, inventory, and accounting — built for Indian SMBs.

  • No credit card to explore
  • GST-ready workflows
  • Made for India
Explore T7ERPBook a Free DemoWhy T7ERP

Inventory & Stock

GST Billing & Reports

Multi-Branch POS

Purchase to Payment

FAQ Guide

Frequently Asked Questions

GSTIN structure, checksum, privacy, and how this differs from official portal verification.

A GSTIN is a 15-character Goods and Services Tax Identification Number assigned to GST-registered persons in India. It encodes the state code, PAN, registration sequence, a reserved character (Z), and a checksum.
Structure validation only confirms the 15-character pattern and checksum. When format passes, this tool also attempts a live taxpayer lookup (legal name, status, address, and more). Always reconfirm critical status on the official GST portal.
After structure validation succeeds, we look up taxpayer details via a GST validation service. Results can lag or fail; use the official GST portal for final compliance decisions.
The 15th character is a base-36 check digit computed from the first 14 characters. It helps catch typing errors such as swapped digits or wrong letters.
Positions 3–12 embed the taxpayer’s Permanent Account Number. Entity type is derived from the 4th character of that PAN (GSTIN position 6) — for example P = Individual / Proprietorship, C = Private or Public Company, F = Partnership Firm, L = Limited Liability Partnership.
They are the GST jurisdiction (state or Union Territory) code — for example, 27 for Maharashtra and 24 for Gujarat. Unrecognized codes fail structural validation.
In the standard GSTIN pattern used for most taxpayers, the 14th character is reserved and set to Z. Other values fail Phase 1 structural checks.
Yes. It is free to use with no signup. Validation runs in your browser and values are not uploaded to T7 servers by default.
No. Phase 1 validation is local. We do not save entered GSTINs to an account or send them for registry lookup in this release.
Use the official GST taxpayer search on the GST portal. That service can confirm legal name, status, and other registered details after CAPTCHA or portal authentication as required.
Yes. Use “Try an example” on the validator to load a documented sample and explore the decoded segments.
Yes. The validator is designed for phones and tablets with the same structure checks and diagnostics as desktop.
Common issues include wrong length, invalid characters, unrecognized state codes, malformed PAN segments, a non-Z reserved character, and checksum mismatches — including O/0 and I/1 style typing mistakes that break the check digit.

Ready to invoice with clean GST data?

Use T7 free GST Invoice Generator and GST Calculator — then run masters, billing, and compliance in T7ERP.

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