What do the fifteen characters mean?

The first two are the state code, 29 for Karnataka. The next ten are the PAN of the business, so every registration it holds across states shares them. The 13th says which registration this is under that PAN in that state, 1 for the first. The 14th is Z in an ordinary registration. The 15th is the check digit, worked out from the first fourteen.

What is the 14th character?

Z in an ordinary registration. A marketplace’s TCS registration carries C there, and the JSON validator warns when a Table 14 operator’s does not. A registration for deducting tax at source (TDS) carries D.

Does it read an embassy’s UIN?

Yes. A UIN, a non-resident taxable person’s registration and a foreign provider’s of online services have no PAN: after the state code come two digits of year, a three-letter country code, a five-digit serial, UN or ON, NR or OS, and the same check digit. A foreign provider’s always begins 99.

Can I check many at once?

In the app, every GSTIN in a month is checked the same way.

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Is this GSTIN well formed?

Type or paste a GSTIN. Each character is checked as you go: the state code, the PAN inside it, the entity number and the check digit worked out from the other fourteen. An embassy’s UIN and a foreign business’s registration are read by their own layout.

Updated 25 September 2026

Read: Invalid GSTIN of recipient in GSTR-1: what to do

GSTIN

StatePANEntityDefault ZCheck digit

This checks the shape and the check digit, which catches any one mistyped character and most swapped pairs. Whether the registration is active is something only the portal knows.

In the app, every GSTIN in the month is checked the same way. A bad one of yours stops the download; a buyer’s is named, with the invoices it moved out of B2B.Start free →

How to use it

Three steps, and nothing leaves the page.

01Type or paste the GSTIN.
02Press Check GSTIN, or type all 15 characters.
03A check digit that does not match usually means one typo in the first 14 characters.

What it checks

Each rule, and what it does when it fails.

BlockerTwo digits, a PAN, the entity number and a letter, in that order

BlockerA PAN of five letters, four digits and a letter

BlockerThe check digit, worked out from the first 14

BlockerA state code no registration begins with

PassesA UIN, a TDS registration, a non-resident’s or a foreign online provider’s, each by its own layout

RuleWhether it is active: only the portal knows

What every check rests on

Questions

About the GSTIN checker.

Something else? Read every answer, or write to us.

It means it is well formed. Only the portal knows whether a registration exists and is active.

The other free tools

All free tools

01GSTR-1 from marketplace reportsDrop a month of Amazon, Flipkart, Meesho or Myntra files and see the return and every check, worked out in your browser.02GSTR-1 JSON validatorHold a JSON from any product against the offline tool’s rules and the Table 12 cross-tally before you upload it.03HSN code checkerWhether a code can exist, how many digits Table 12 needs from you, and the rate on file, with what is not known said plainly.04GST late fee calculatorThe late fee on a GSTR-1, GSTR-3B, GSTR-4, GSTR-7 or GSTR-8 from the due date and the filing date, with the caps in force and the three-year bar.05TCS calculator for sellersWhat a marketplace should collect under section 52 on a month’s net sales, by tax head, against what the portal shows.

Do the whole month in fynxIQ.

This check and every other, on every return, with the GSTR-2B, the GSTR-3B draft and Tally. Free for 2 GSTINs and 6 prepared returns a month.

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