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API Tester
Test REST APIs with a simple interface. Set headers, body, params and view formatted responses.

API Tester

Welcome to our free, online API Tester. This tool allows you to quickly and securely process your files directly in your browser. No data is sent to our servers, ensuring your privacy is fully protected.

How to use the API Tester

  1. Upload your file: Drag and drop your file into the workspace or click to browse.
  2. Adjust settings: Use the controls in the sidebar or toolbar to customize the output to your needs.
  3. Process & Download: Click the primary action button to process your file. Once done, you can instantly download or copy the result.

Why use our API Tester?

Frequently Asked Questions (FAQ)

Is it safe to use this API Tester?

Absolutely. We use local browser processing (Client-Side), meaning your files never leave your computer. Your privacy and data security are our top priority.

Do I need to download any software?

No installation is required. Everything runs directly inside your modern web browser (Chrome, Safari, Firefox, Edge).

Are there any limits on file size or usage?

Since the tool uses your device's memory, the only limits are based on your computer's RAM and processing power. We do not enforce any artificial paywalls or usage caps.