CodeTools

CPF generator for tests

Generate fictional, mathematically valid Brazilian CPF numbers for development and staging · 100% client-side · no values are sent to the server

These values are fictional Brazilian individual taxpayer numbers (CPF) and are for tests only. Mathematical validity does not confirm existence, ownership, or registration status.

Quick guide and information

How to use

  1. Choose 1 to 10 values to generate.
  2. Decide whether to show the `000.000.000-00` mask.
  3. Click Generate CPF and copy the result into your test environment.

When to use

Use fictional Brazilian CPF numbers to fill fixtures, test form masks, validate staging flows, or simulate records in environments that must not contain real personal data.

Never use the result for a real registration, to identify a third party, or to bypass an application's controls.

How is a CPF validated?

A CPF has 11 digits: nine form the base and the last two are check digits. They are calculated with the modulo 11 method, using different weights in each step.

The generator calculates the check digits in the browser and rejects sequences made of the same digit, such as `111.111.111-11`.

Practical cases

  • Test a CPF mask in a form that accepts Brazilian documents.
  • Create fixtures for automated registration tests.
  • Fill a demo without exposing real personal data.

Limitations and responsible use

This generator does not query Brazil's Federal Revenue Service, does not verify existence, ownership, or registration status, and does not store the created values.

Use it only in development, QA, and staging. A mathematically valid number is not a real Brazilian identity document.

FAQ

Does the generated CPF belong to someone?

The tool does not query registries and does not claim that any result belongs or does not belong to a person. Use the values only in test environments.

Does processing leave the browser?

No. Generation is local and no value is sent to the CodeTools server.

Why is mathematical validity not enough?

Check digits detect inconsistencies in the sequence, but they do not prove existence, ownership, or regularity with an official source.

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