SIREN Checker User Guide – Effortlessly Verify French Business Registration Numbers

What is a SIREN Number?

The SIREN (Système d'Identification du Répertoire des ENtreprises) is a unique 9‑digit identifier assigned by INSEE to every legal entity registered in France – companies, associations, sole traders, etc. It serves as the official registration number for French businesses.

How to Use This SIREN Checker

Just three simple steps to verify whether your SIREN number is correctly formatted:

1. Paste or type the 9‑digit number into the input field (spaces and hyphens are not required).
2. Click the Validate button.
3. Read the result – the SIREN Checker will tell you if the format is valid and if the check digit matches.

You can quickly test the tool with the example number provided. If the input is incorrect (wrong length, contains letters, or fails the checksum), the SIREN Checker will give a clear error message.

This tool is completely free, no registration needed – ideal for business owners, finance teams, and anyone dealing with French company data.

Frequently Asked Questions

1. Does the SIREN Checker guarantee that the company actually exists?

This SIREN Checker validates the structure and checksum of the number according to the standard algorithm. A "valid" result means the number is syntactically correct. To confirm active registration and legal status, you must consult official French databases such as INSEE or Infogreffe. Our checker does not store or verify business details.

2. Why does my SIREN show up as invalid?

Common reasons: the number is not exactly 9 digits; it contains non‑numeric characters (SIREN must be digits only); or the final check digit does not match the computed value. Double‑check your entry, or test with the sample number to ensure the SIREN Checker is working correctly.

3. Can I validate multiple SIREN numbers in batch?

This page is designed for single checks. If you have bulk validation needs, feel free to contact us – we are happy to help.

4. What’s the difference between SIREN and SIRET?

SIREN is a 9‑digit number identifying a legal entity; SIRET is a 14‑digit number composed of the SIREN plus a 5‑digit NIC (internal classification code) that identifies a specific establishment or branch. For example, a company has one SIREN but may have several SIRET numbers for different locations.

5. Do I have to pay for this service?

Not at all – the SIREN Checker is completely free. OkeyTool is committed to providing practical online utilities for everyday use.

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