GLN Checker User Guide – Verify Location Codes Effortlessly

What Is a GLN?

The Global Location Number (GLN) is a GS1‑standard identifier for any party or place – companies, departments, warehouses, or stores. It consists of 13 digits: a GS1 company prefix, a location reference, and a check digit. The check digit uses the same modulus‑10 algorithm as EAN‑13 (odd positions ×3, even ×1, then the complement to 10). GLNs are widely used in EDI, supply chain visibility, order management, and logistics labelling – they're a core part of the GS1 system.

How to Use This GLN Checker

Three simple steps to confirm if your GLN is correct:

1. Paste or type a 13‑digit number into the field (the input automatically accepts only digits and caps at 13).
2. Hit the “Check” button.
3. Read the result – the GLN Checker tells you whether the format is valid and the check digit matches.

Feel free to try the example numbers to see the tool in action. If anything's off – wrong length, non‑numeric characters, or a bad check digit – you'll get a clear warning.

This GLN Checker is completely free, no registration required, and ideal for supply chain professionals, logistics staff, and IT engineers dealing with location codes.

Frequently Asked Questions

1. Does a valid GLN guarantee the location actually exists?

This GLN Checker only validates the syntax and modulus‑10 check digit. A “valid” result means the number is structurally correct. To confirm real‑world registration or assignment, you'll need to consult the GS1 global registry or your issuing authority.

2. Why does my GLN come back as invalid?

Common reasons: length not exactly 13, characters that aren't digits, or a mismatched check digit. For example, 1234567890123 uses the EAN‑13 algorithm – if the last digit is wrong, the GLN Checker will flag it. Double‑check the number or test with a known valid sample.

3. Can this tool validate GLNs in bulk?

This page is designed for single entries. For batch needs, you can integrate via our API endpoint /iso-checker with parameters type=gln&number=your_number.

4. What's the difference between a GLN and an EAN‑13 barcode?

EAN‑13 identifies trade items (products), while GLN identifies locations (businesses and facilities). Both use 13‑digit numbers and the same check‑digit algorithm, but their prefix assignments and purposes differ. In some cases, one organisation may have both an EAN‑13 (for products) and a GLN (for its location).

5. Do I need to pay for this GLN Checker?

Not at all – it's 100% free. OkeyTool is all about providing practical online utilities to make your daily work easier.

If you have further questions or spot any issues, please reach out via the contact links at the bottom of the page. Thanks for using our GLN Checker!