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.
Finance · free tool
SIRET and SIREN validator for French company identifiers
Validate the length, structure and Luhn key of French SIREN or SIRET numbers.
Your tool
SIRET / SIREN Validator
Accepts spaces, dots and hyphens. Local validation by length and Luhn key.
Use it well
How to use SIRET / SIREN Validator
Steps
- Paste a SIREN or SIRET.
- Remove spaces or separators if needed.
- Check length and Luhn feedback.
- Use official sources when existence matters.
Limits and good practices
Good practices
- Use realistic test values when validating forms, exports or API payloads.
- Keep real customer, banking and production secrets out of public tools.
- Check the output format before copying it into a production workflow.
- Document whether a value is generated, validated, converted or only estimated.
Common mistakes
- Confusing valid format with real-world validity
- A generated or locally validated value can match a format without proving that it exists in an official system.
- Using real production data
- Public utilities are best for test data, demos, fixtures, QA and quick checks, not for confidential values.
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.