Free Developer Tools Online

Fast browser-based utilities for everyday development work. Choose a formatter, decoder, converter, generator, or testing tool below.

Development & Testing

Cron Expression Explainer

Decode and understand cron schedule expressions instantly.

JWT Decoder

Decode JSON Web Tokens and view the header and payload.

Regex Tester

Test regular expressions with plain English explanations.

Fake Data Generator

Generate random, realistic mock data for databases and APIs.

HTTP Status Code Encyclopedia

Search and understand REST API HTTP status codes meanings.

Utilities

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa.

Diff Checker

Compare two text blocks and visualize the differences.

Color Contrast Accessibility Checker

Test foreground and background color combinations for WCAG compliance.

Encoders & Decoders

Base64 Encoder and Decoder

Easily encode text to Base64 or decode Base64 back to text.

Formatters & Converters

Naming Convention Converter

Convert strings between camelCase, snake_case, PascalCase, and kebab-case.

JSON Formatter and Validator

Format, beautify, and validate JSON data instantly.

Tailwind Class to CSS Converter

Convert shorthand Tailwind class lists into pure vanilla CSS.

Generators

Gitignore Generator

Generate standard .gitignore templates for your projects.

CSS Box Shadow Generator

Visually generate complex, modern CSS box-shadow code.

ENV Variable Template Generator

Extract an .env.example template from your actual .env file safely.