Fake SIRET/SIREN Generator
Generate fake, algorithmically valid SIRET and SIREN numbers (correct Luhn key) to feed test datasets or demo forms. These numbers are entirely fictitious and do not match any real company. 100% local generation in your browser.
⚠️ Strictly fictitious numbers, randomly generated for testing purposes. Never use them to impersonate a real company.
| SIREN (FAKE) | SIRET (FAKE) | |
|---|---|---|
| 775 793 078 | 775 793 078 83695 | |
| 346 378 268 | 346 378 268 21323 | |
| 443 379 086 | 443 379 086 75279 | |
| 642 105 407 | 642 105 407 40741 | |
| 774 051 403 | 774 051 403 55396 |
How It Works
The SIREN (9 digits) and SIRET (14 digits, SIREN + establishment NIC code) in France follow the Luhn check algorithm, which can detect a typo: the last digit is calculated from the previous ones. This tool draws random digits then calculates this check digit to produce numbers that would pass a Luhn format validation, without corresponding to a company registered in the trade register.
Can these numbers be used for a real company?
No, absolutely not. A real SIRET is assigned exclusively by INSEE when a company is registered. These numbers are only meant to populate test databases, mockups, or demonstration forms that require a valid format without real data.
Why validate the format with the Luhn algorithm?
Many forms and test systems apply a format verification (length, check key) before accepting a SIRET. By generating numbers whose Luhn key is correct, these fake numbers pass this first technical validation level, which is useful for testing a form's behavior without depending on a real company.
The draw and check-key calculation are done entirely in your browser; no generated number is transmitted to a server.