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GSTIN validator

Check the structure and checksum of a GSTIN, identify its state code and extract the PAN. This tool does not contact the GST portal or verify registration status, business identity or tax compliance.

No login. Inputs stay in your browser.

15 letters and digits. Whitespace is ignored and letters are converted to uppercase.

Structure check

Enter a GSTIN to check its format and checksum.

How to use this tool

  1. Enter the 15-character GSTIN you want to check.
  2. Review the format, state-code and checksum result. Letters are normalised to uppercase and whitespace is ignored.
  3. For a matching structure, review the state and PAN. Verify registration details separately with the official GST service when needed.

Common questions

Does a matching checksum mean the GST registration is active?

No. A checksum only checks the characters and their relationship. This tool never checks registration status, legal name or filing history.

Is the GSTIN sent to a server?

No. Validation runs entirely in this browser and does not call the GST portal.

What does a legacy state code mean?

Some GSTIN state codes refer to earlier territorial arrangements. A legacy-code result is labelled; it does not establish the current status of a registration.

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