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 data stays in your browser whenever the task can be processed locally.

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French SIRET / SIREN Generator

Number of examples Number type

Generated numbers

Good to know

SIREN identifies a French company and SIRET identifies a specific establishment. Fictitious examples help test B2B forms without using real companies or real administrative IDs.

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Understand

Understand French SIRET / SIREN Generator

What is French SIRET / SIREN Generator?

SIREN identifies a French company and SIRET identifies a specific establishment. Fictitious examples help test B2B forms without using real companies or real administrative IDs.

Main use case: Generate fake SIREN or SIRET numbers for onboarding, billing, CRM, QA and demo datasets.

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.

How to use the tool

Choose SIREN, SIRET or both.
Set the number of examples.
Generate fictitious values.
Validate them locally if your workflow requires it.

Best 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.

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.