Common use cases
- B2B onboarding
- Fill company identification fields in test environments.
- Billing QA
- Prepare realistic company fixtures for invoices.
- CRM demos
- Create non-real French company records.
Finance · free tool
Fake French SIRET and SIREN generator for B2B test data
Generate fictitious French SIREN and SIRET numbers with valid control keys for tests.
Your tool
French SIRET / SIREN Generator
Each row contains a coherent SIREN, NIC and SIRET. The same seed and scenario reproduce the same dataset.
Use it well
How to use French SIRET / SIREN Generator
Steps
- Choose SIREN, SIRET or both.
- Set the number of examples.
- Generate fictitious values.
- Validate them locally if your workflow requires it.
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
What is a fake SIRET?
A fake SIRET is a non-real French establishment identifier used to test forms, CRM records, invoices and QA datasets.
What is the difference between SIREN and SIRET?
SIREN identifies the legal company, while SIRET identifies one establishment of that company.
Are generated SIRET numbers official?
No. They are fictitious values for tests and do not prove a real company exists.
Why use fictitious company numbers?
They reduce the risk of exposing real companies in demos, screenshots or QA 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.