Indian Statutory E-Commerce Compliance Utility

Indian GSTIN Format & Checksum Validator

Instant, zero-friction verification of 15-character Goods and Services Tax Identification Numbers (GSTIN). Calculates the official ISO/IEC 7064 Modulo-36 weighted check digit, validates official State Census codes (01–38, 97, 99), decodes PAN entity types, and identifies non-standard UIN structures. All processing executes 100% client-side in your browser.

⚖️

Mandatory Statutory Notice on Validation Scope: This utility verifies compliance with the statutory 15-character format, official State Census code allocation, PAN entity format, and ISO/IEC 7064 Mod 37, 36 (Luhn Mod-36) check digit under Section 25 of the CGST Act, 2017 and Rule 8 of the CGST Rules, 2017. It is an offline mathematical checksum validator. It does NOT query the government GSTN portal to confirm whether a taxpayer's registration is currently active, suspended, or cancelled, nor does it establish legal entity identity or tax filing compliance.

Enter 15-Character Indian GSTIN 0 / 15 Characters

Sample Vectors:

State / UT Code (Pos 1–2) -

—

Census state identifier

PAN Number (Pos 3–12) -

—

10-digit income-tax identifier

Entity Type (PAN Pos 4) -

—

Taxpayer constitution

Entity Index (Pos 13) -

—

Registration count in state

Default Constant (Pos 14) -

—

Prescribed statutory 'Z'

Check Digit (Pos 15) -

—

ISO 7064 Mod-36 checksum

Statutory 15-Character Structural Breakdown CGST Rule 8 Baseline

Positions	Segment Name	Extracted Value	Statutory Requirement & Rule	Segment Status
1 – 2	State / UT Code	—	Numeric Census State Code (01–38, 97, 99)	Pending
3 – 7	PAN Alpha Series	—	5 Alphabetic characters [A-Z]; Char 4 indicates entity constitution	Pending
8 – 11	PAN Numeric Sequence	—	4 Numeric digits [0001–9999]	Pending
12	PAN Check Character	—	1 Alphabetic check character [A-Z]	Pending
13	Entity Registration Index	—	Alphanumeric index [1-9, A-Z] of business entity within state	Pending
14	Default Constant	—	Constant letter 'Z' by statutory default (Rule 8)	Pending
15	Luhn Mod-36 Check Digit	—	ISO/IEC 7064 Mod 37, 36 weighted checksum character	Pending

📁

Drop CSV, TXT, or TSV File Here

Upload customer or vendor invoice exports up to 25,000 records or 10 MB.
Auto-detects columns: gstin, gst_number, tax_id.

Or Paste Multiple GSTINs (One per Line) 0 Lines

Streaming validation in Web Worker... 0%

Automate Indian Invoicing & GST Compliance with Sanocea Workflows

Need to validate GSTINs automatically inside your ERP, Shopify store, or accounting pipeline? Explore our self-hosted offline toolkits and automated operations workflows:

Free Workflow · Python CLI

SNC-WF-090: Validate Indian GST Numbers Offline

Lightweight Python/CLI package that audits customer and vendor CSV ledgers before generating tax invoices. Zero API dependencies and 100% offline.

View Free Workflow & Download Script →

Free Workflow · PDF Automation

SNC-WF-025: B2B Invoice PDF Generation & Validator

Generates statutory tax-compliant B2B invoice PDFs with verified GSTINs, HSN codes, and CGST/SGST/IGST tax breakup tables.

Explore B2B Invoicing Workflow →

Commercial Automation

E04: Daily Revenue & Channel Performance Digest

Automated multi-channel accounting that reconciles sales invoices, marketplace TCS, bank settlements, and statutory tax credits into your general ledger.

Learn About Automated Reconciliation →