What do the errors mean?

Errors will indicate if the GSTIN is too short, has an invalid state code, contains invalid characters, or fails the checksum verification.

Can I validate thousands of GST numbers at once?

Yes, you can process massive CSV files with thousands of rows in seconds, all within your browser.

Validate Indian GST numbers in bulk from a CSV file. Checks format and checksum. Securely process files in your browser memor

Your files never leave your device. Processed locally. 100% private.

Unlocking Tool Engine...

Complete your task perfectly in just three straightforward steps.

Upload a CSV file containing a column of GST numbers.

Select the GST column and click validate to run checksum and format checks.

Download the verified list, complete with state details and error flags for invalid GSTINs.

Everything you need to know about the GST Validator.

How does the GST validator work?

It checks the 15-character GSTIN format, validates the state code, checks the PAN number structure, and verifies the mathematical checksum digit.

Does this connect to the official GST portal?

No. This tool performs a mathematical and structural validation of the GSTIN (checksum validation). It does not query live government databases.

Is it safe to upload my customer list here?

Absolutely. Your data never leaves your computer. The entire validation process happens locally in your browser.

Continue working with our suite of free data utilities.

Validate Indian PIN codes in bulk from a CSV column. Fast, private, and secure browser-based tool with no signups or software

Hide secret text inside an image using LSB steganography. Also detect and extract hidden messages. The safest way to process

Validate CSV structure, headers, data types, and required fields against a schema. Processed entirely in your browser for 100

Validate a CSV file against a JSON or YAML schema definition. Fast, private, and secure browser-based tool with no signups or

Generate contracts from CSV data using a template. Mail-merge style document creation. Securely process files in your browser

Validate and flag invalid email addresses in a CSV column. Syntax and domain checks. The safest way to process sensitive data