GSTIN Validator
Use this free GSTIN Validator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Validate an Indian GSTIN (GST Identification Number) format instantly. Free online GSTIN validator checks structure, state code, PAN and checksum without storing your input.
Calculator Inputs
About GSTIN Check
Use this free GSTIN Validator to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
GSTIN Anatomy (15 chars): Positions 1–2: 2-digit state code (per GST state/UT list, e.g., 27=Maharashtra, 29=Karnataka, 07=Delhi). Positions 3–12: 10-char PAN (5 letters + 4 digits + 1 letter). Position 13: Entity code (1 digit/letter for multiple registrations in same state). Position 14: Always "Z" (reserved). Position 15: Checksum digit (alphanumeric, algorithm not public).
Step-by-Step Validation: The tool checks length (exactly 15), character set (A–Z, 0–9), state code (numeric), PAN format (regex ^[A-Z]{5}[0-9]{4}[A-Z]$), entity code (alphanumeric), mandatory "Z" at position 14, and checksum character (alphanumeric). Each failure returns a specific message — you know exactly what to fix.
State Code Reference: 37 valid codes covering 28 states + 8 UTs + 1 center jurisdiction. Common: 07 (Delhi), 27 (Maharashtra), 29 (Karnataka), 33 (Tamil Nadu), 36 (Telangana). Invalid state codes (00, 99, letters) are rejected immediately.
Format Only — Not Portal Status: Structural validity ≠ active registration. A GSTIN can be well-formed but cancelled, suspended, or never issued. For live status, query the GSTN portal (gst.gov.in) — this tool does not and cannot access it.
Data Privacy: Validation runs entirely in your browser. The GSTIN never leaves your device, is never logged, and is never transmitted. Critical for handling sensitive taxpayer identifiers under India's data protection norms.
Where it is used
An accountant in Austin onboarding a new Indian vendor; a tax consultant in Chicago verifying client GSTINs before filing; an AP clerk in Miami processing cross-border invoices; a finance lead in Denver auditing procurement records; a compliance officer in Seattle checking marketplace seller registrations; a CFO in New York reviewing international entity onboarding.
How to use the GSTIN Check
- GSTIN / GST Number — enter the value (e.g. 27AAPFU0939F1ZV).
- Calculate — press the Calculate button to see the result instantly above.
Examples
Maharashtra GSTIN
Invalid PAN Portion
Wrong State Code
Frequently Asked Questions
- What is a GSTIN?
- A GSTIN (GST Identification Number) is the 15-character unique number assigned to a taxpayer registered under India's Goods & Services Tax. It encodes state code, PAN, entity type, and a checksum.
- Does this check live registration status with GSTN?
- No — this validates only structural/format rules locally. It does not query the GSTN portal. For live status (active/cancelled/suspended), use the official GST portal search.
- Is my GSTIN stored or transmitted?
- Never. Validation happens entirely in your browser. No input is sent to or stored on any server. This tool collects nothing.
- Why does position 14 have to be "Z"?
- Per GSTIN specification, the 14th character is reserved and always "Z". Any other character indicates a malformed or fabricated GSTIN.
- What if the state code is valid but the PAN fails?
- The tool reports the first failure encountered. PAN must match ^[A-Z]{5}[0-9]{4}[A-Z]$ exactly — 5 letters, 4 digits, 1 letter. Common errors: wrong length, digits in letter positions, lowercase.
- Can this validate multiple GSTINs at once?
- No — single input only. For bulk validation, use the GSTN portal's bulk search or script the logic in your own pipeline.