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GSTIN Checksum Validator

GSTIN Checksum Validator is part of Toolspire and is ready as soon as this page loads. The pattern is two digits, five letters, four digits, one letter, one entity character, Z, and the check character. No government database is queried.

Runs in this tabFreeNo account

On this page

What you can do here

Pattern first

A string that is not 15 characters of the GSTIN shape never reaches the checksum.

The example is computed

C is the check character for that 14-character prefix.

No portal

Nothing is sent to a tax site.

The sequence

How to use the GSTIN Checksum Validator

  1. 1

    Paste 15 characters

    The sample should read Valid checksum.

  2. 2

    Change C to D

    It should fail and still mention C.

  3. 3

    Do not treat valid as registered

    The page cannot see the GST portal.

Worth knowing

  • GSTIN Checksum Validator on Toolspire: 22AAAAA0000A1ZC matches the pattern and the check character C.
  • The check uses a 36-character alphabet and alternating factors 1 and 2.
  • A wrong final character is Invalid checksum, and the detail shows the character that would pass.
  • Passing is not a lookup. The sample is an example string, not proof of a taxpayer.

A character, not a registration

A GSTIN’s last character is a checksum over the first 14, using a base-36 alphabet and factors that alternate 1 and 2. 22AAAAA0000A1Z produces C, so 22AAAAA0000A1ZC passes. The state-code digits and the PAN-shaped middle are only checked for shape. Whether that number was issued is a question for the tax portal, which this page does not call.

FAQ

Questions about GSTIN Checksum Validator

Where does GSTIN Checksum Validator run?

GSTIN Checksum Validator runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

Does 22AAAAA0000A1ZC pass?

Yes, the shape and the checksum. It is an example, not a lookup result.

What if the last character is wrong?

Invalid checksum. The detail names the character that fits.

Is a passed GSTIN registered?

Not according to this page. No register was queried.

Are lowercase letters accepted?

They are folded to uppercase before the check.

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