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Free Online Developer Tools

Free Online
Developer Tools

Format JSON, decode JWTs, test APIs, generate UUIDs, convert data, and work faster with free browser-based tools.

Essential Tools Suite

Everyday tools for developers, all in one place.

Browse More Tools

JSON Formatter

Format, validate, and beautify JSON instantly for debugging and development.

API Request Tester

Send HTTP requests, inspect responses, and test REST APIs directly in your browser.

Mock API Generator

Create mock API endpoints for frontend development and integration testing.

PDF Tools

Merge, split, and convert PDF files without installing additional software.

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Discover useful tools and resources to make your development workflow simpler and faster.

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Frequently Asked Questions

Quick answers about using MCYG tools, browser compatibility, privacy, and troubleshooting. For tool-specific help, see the instructions on that tool's page.

Are MCYG tools free to use?

Check the individual tool page for its available features, usage limits, and any restrictions.

Do I need to install anything to use these tools?

MCYG tools are designed to run in your web browser. Most can be used without installing a separate application, though some features may have specific requirements.

Do these tools work on mobile phones and tablets?

Many tools can be opened on mobile devices, but usability may vary depending on the tool, screen size, and browser.

Is it safe to enter sensitive data or upload private files?

Review the relevant tool's privacy and data-handling information first. Avoid entering passwords, API keys, access tokens, or confidential information unless you understand how it will be processed.

Why isn't a tool working or why am I seeing an error?

Check your internet connection, refresh the page, update your browser, and verify your input. If the problem persists, check the tool's own help instructions.

Which browsers are supported?

Use an up-to-date browser such as Chrome, Edge, Firefox, or Safari. Support can vary by tool and feature.

Where can I find help for a specific tool?

Open the relevant tool page and look for its instructions or FAQs, which cover that tool's specific options, inputs, and limitations.