Free API Tester Online
Test REST APIs with GET, POST, PUT, DELETE requests. Free, fast, and works entirely in your browser with no sign-up required.
API Tester
Test REST APIs with full request/response inspection, authentication, history, and code generation.
API Request
Try These Sample APIs
Keyboard Shortcuts
- Ctrl+Enter - Send request
- Ctrl+H - Toggle history
- Some APIs may block browser requests due to CORS policies
- For APIs requiring authentication, use the Auth tab
- Import existing requests using the cURL import feature
Frequently Asked Questions
What is the API Tester?
The API Tester is a free online tool for testing REST APIs by sending GET, POST, PUT, DELETE, and other HTTP requests directly from your browser.
Is the API Tester free?
Yes, the API Tester is completely free with no registration required.
Can I set custom headers and body?
Yes, the API Tester lets you configure custom headers, request body (JSON, form data), authentication, and query parameters for each request.
Is my data safe with this tool?
Absolutely. The API Tester processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the API Tester work on mobile devices?
Yes, the API Tester is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the API Tester in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
What programming languages or formats does this support?
The API Tester supports a wide range of popular formats and languages. Check the tool interface for the full list of supported options.
How do I use the API Tester?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The API Tester works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free API Tester Online
Free API Tester Online is a free, browser-based tool in our Developer Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.