# Check Digit

Browse 8 online check digit tools for working with check digit data in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.

> Canonical page: https://elysiatools.com/en/tags/check-digit

## Overview

Use 8 Check Digit tools to process, convert, validate, and manage check digit data through a browser-based interface without installing software.

## Frequently asked questions

### What can I do with Check Digit tools?

You can process, convert, validate, and manage check digit data using the available browser-based tools.

### Do I need to install software?

No software installation is needed. You can operate the tools through your browser.

### How is my data handled?

Processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Tools

- [CUSIP Validator](https://elysiatools.com/en/tools/cusip-validator): Validate 9-character CUSIP North American securities identifiers with mod-10 check-digit verification, issuer base and issue-number breakdown.
- [EAN-8 Barcode Validator](https://elysiatools.com/en/tools/ean8-validator): Validate 8-digit EAN-8 / GTIN-8 product barcodes with check-digit verification, GS1 country prefix and packaging breakdown.
- [ISIN Validator](https://elysiatools.com/en/tools/isin-validator): Validate International Securities Identification Numbers (ISO 6166 ISIN) with Luhn check-digit verification, country/issuer prefix and NSIN breakdown.
- [Luhn Checksum Calculator](https://elysiatools.com/en/tools/luhn-checksum): Validate or generate numbers using the Luhn algorithm (mod-10). Works for credit cards, IMEI, IMEISV, SIN, NPI and any custom Luhn-based identifier.
- [Mod-11 Checksum Calculator](https://elysiatools.com/en/tools/mod11-checksum): Validate or generate numbers using the Modulus-11 (ISO 7064) check-digit algorithm with ISBN-10 (10..2), Norwegian-ID (3,7,6,1,8,9,4,5,2) and generic 2-7 weight schemes.
- [ABA Routing Number Validator](https://elysiatools.com/en/tools/routing-number-validator): Validate 9-digit US ABA bank routing numbers (RTN) with MICR check-digit verification, Federal Reserve district lookup and ABA institution breakdown.
- [SEDOL Validator](https://elysiatools.com/en/tools/sedol-validator): Validate 7-character UK/Irish SEDOL securities identifiers with weighted mod-10 check-digit verification and SEDOL-7 structure breakdown.
- [UPC/EAN Barcode Validator](https://elysiatools.com/en/tools/upc-ean-validator): Validate GTIN-12 (UPC), GTIN-13 (EAN), GTIN-8, and GTIN-14 product barcodes with check digit verification

## Related content

- [Hash](https://elysiatools.com/en/tags/hash): Browse 30 online hash tools for SHA, MD5, CRC, checksum, and digest workflows. Text inputs are not stored; uploaded files are deleted after 6 hours.
- [Luhn](https://elysiatools.com/en/tags/luhn): Use 8 online Luhn tools in your browser for Luhn-related data checks. Text inputs are not stored, and uploaded files are deleted after 6 hours.
- [QR Code](https://elysiatools.com/en/tags/qr-code): Browse 10 online QR Code tools to process, convert, validate, and manage QR code and barcode data in your browser.
- [Credit Card](https://elysiatools.com/en/tags/credit-card): Browse 7 online credit card tools for processing, converting, validating, and managing credit card data in your browser.
- [ID](https://elysiatools.com/en/tags/id): Browse 17 online ID tools for working with identifiers and ID-related data in your browser. Text inputs are not stored, and uploaded files are deleted after 6 hours.
- [US](https://elysiatools.com/en/tags/us): Browse 33 online US tools for processing and managing US files and data. Use them in your browser; text inputs are not stored and uploaded files are deleted after 6 hours.