A curated collection of free online tools designed to accelerate your workflow.
From data generation to validation and conversion, find what you need in one place.
Online Tools
Online Data Generetor
Need realistic test data? Generate valid Brazilian fake data like CPF, CNPJ, addresses, and more, directly
in your browser.
Online Data Validator
Validate CPF, alphanumeric CNPJ, CNS, PIS, Credit Card and other Brazilian documents. Free and secure online tools for developers and QAs.
CNAB Rainbow
Color CNAB file viewer with field highlighting. For CNAB 150, 240, and 400.
CNAB Converter
Simulate the full banking cycle by converting CNAB 240 and CNAB 400 remittance files to return files.
Packages and Extensions
Live API & URL Monitor
Monitor API status and availability in real-time, directly within VS Code.
API Test Builder
Automatically generate Playwright/Cypress test scripts from your Swagger/OpenAPI spec.
Gerador-BR
A Node.js package to generate valid Brazilian data for your automated tests.
Chrome Extensions
Gerador de Dados Fictícios
Fill test forms with valid Brazilian data (CPF, CNPJ, etc.) in a single click.
Validador de Boleto
Instantly validate Brazilian bank slip codes and convert them to barcodes.
Jira Expand Workspace
Optimizes issue view in Jira by expanding the area useful for a distraction-free experience.
CNAB 400 Converte
Convert CNAB 400 Remittance files (.rem) to Return files (.ret) with one click, directly in your browser.
Frequently Asked Questions (FAQ)
Box4Dev (Box for Developers) is a collection of free, high-quality online tools and open-source projects designed to solve common, everyday problems for developers, QAs, and tech students.
Yes, absolutely. Every tool, extension, and package featured on Box4Dev is 100% free. The project is supported by the community and aims to provide valuable resources without a paywall.
Our online tools (Generators, Validators, Converters) run entirely in your browser and are great for quick tasks. For offline use and integration into your automated workflows, we recommend our NPM packages and VS Code extensions.
Box4Dev is community-driven. The best way to contribute is through our GitHub repositories. You can report bugs, suggest new features, or submit a pull request. We welcome all contributions!