OnSubmitSteps
- Paste a SIREN or SIRET.
- Remove spaces or separators if needed.
- Check length and Luhn feedback.
- Use official sources when existence matters.
Finance · free tool
SIRET and SIREN validator for French company identifiers
Validate the length, structure and Luhn key of French SIREN or SIRET numbers.
Parameters and result
Accepts spaces, dots and hyphens. Local validation by length and Luhn key.
Use it well
How to use SIRET / SIREN Validator
Common use cases
- Form validation
- Check local format before submitting a company form.
- CRM import
- Detect malformed identifiers in exported lists.
- Billing QA
- Verify test values used in invoice scenarios.
FAQ
Frequently asked questions
Does a valid SIRET prove a company exists?
No. Local validation checks structure, not official existence.
What is the Luhn key?
It is a checksum used to detect many typing mistakes in numeric identifiers.
Can I validate lists?
This tool is designed for quick checks; use batch scripts for large datasets.
Are my inputs sent to a server?
OnSubmit tools run in the browser whenever the task can be processed locally. Avoid pasting production secrets, real banking details or personal data into public tools.