Developer & QA Tools

A collection of free online tools designed to streamline your workflow.

Find generators, validators, converters, and extensions in one place to speed up your development.

Online Tools

100% browser-based processing (Privacy-First)

Online Generators
Generate valid Brazilian test data like CPF, CNPJ, addresses, and more.
Online Validators
Validate Brazilian documents with official algorithms and total security.
CNAB Rainbow
CNAB file viewer with field highlighting for easy reading.
CNAB Converter
Simulate the banking cycle by converting remittance files to return files.

NPM Packages

gerador-br
The definitive library for generating Brazilian test data at scale.
validador-br
Programmatically validate Brazilian documents with 100% coverage.
gerador-boleto
Generate bank slip (boleto) data following the FEBRABAN standard.

VS Code Extensions

Live API & URL Monitor
Monitor the status and availability of endpoints and URLs in real-time.
API Test Builder
Generate Cypress and Playwright test scripts from Swagger/OpenAPI.

Chrome Extensions

Bring the power of Box4Dev to any web form or system.

Fake Data Generator
Fill test forms with valid Brazilian data in one click.
Boleto Validator
Validate bank slip structure and convert barcodes instantly.
Jira Optimizer
Optimize your Jira workspace for a focused and clean experience.
CNAB 400 Convert
Convert CNAB 400 remittance files to return files in the browser.