Finance · free tool

French VAT number validator for invoices and B2B forms

Check the local format of a French intra-community VAT number. Your data stays in your browser whenever the task can be processed locally.

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French VAT Number Validator

Intra-community VAT number

Local format check. For official existence validation, also use VIES.

Analysis

Good to know

A French VAT number includes the FR country prefix, a two-character key and the company SIREN.

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Understand

Understand French VAT Number Validator

What is French VAT Number Validator?

A French VAT number includes the FR country prefix, a two-character key and the company SIREN.

Main use case: Check the local structure of a French VAT number before using it in invoices, forms, CRM records or QA datasets.

Common use cases

Invoice QA: Check whether a VAT number looks structurally correct.
B2B onboarding: Validate field formatting in company forms.
CRM cleanup: Detect malformed French VAT values in records.

How to use the tool

Paste the French VAT number.
Check the FR prefix and key.
Review the extracted SIREN.
Use VIES for official existence validation.

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

Does local validation prove VAT registration?

No. Use VIES or an official source to verify registration status.

What does a French VAT number contain?

It contains FR, a two-character key and a nine-digit SIREN.

Can I create test VAT numbers?

Use fictitious or sandbox values for QA and never represent them as official numbers.

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.