GSTIN Validator & Decoder

Check GSTINs and see the state, PAN and entity inside each one, one by one or in bulk.

Private by design

Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.

GSTIN Validator & Decoder

Checksum, state, PAN and entity for every GSTIN

GSTINs or CSV

Results (CSV)

The result appears here.

Options

A GSTIN has 15 characters: a 2-digit state code, the holder's 10-character PAN, a number for how many registrations that PAN has in the state, the letter Z, and a check character.

A valid GSTIN is not proof of an active registration. Verify suppliers on the GST portal before claiming input tax credit.
A CSV can have any other columns; the tool picks the one that looks like a GSTIN and keeps each original row.
State code 25 (Daman and Diu) was merged into 26 in 2020; older GSTINs may still carry it.

Checks length, the state code against the GSTN list, the PAN pattern (5 letters, 4 digits, 1 letter), character 14 = Z, and the check character: a base-36 Luhn-style sum over the first 14 characters (alternate weights 1 and 2, each product split into base-36 digits, check = (36 − sum mod 36) mod 36). Verified against published GSTINs.

Preparing tool

How to use GSTIN Validator & Decoder

Paste one GSTIN per line, or a CSV with a GSTIN column, or open a file.
Each GSTIN is checked for length, state code, PAN shape, the letter Z and the check character.
Copy or download the results as CSV.

Read the detailed guide →

What are the limits of GSTIN Validator & Decoder?

This checks that a GSTIN is well formed and its check character is correct. It cannot tell whether the GSTIN is registered, active, cancelled or belongs to the name you were given: confirm that on the official GST portal (Search Taxpayer) before claiming input tax credit. Special numbers such as UIN, TDS and TCS IDs use other formats and show as invalid. Everything runs on your device and nothing you paste is sent anywhere.