API Tester Online
Send requests, inspect responses. Works in your browser, no install needed.
Included in CeevTech Pro. Every new account gets a 30-day Pro trial, no credit card required.
How to use API Tester
Choose a Method and enter the full URL.
Add Headers (one per line, Name: value) and a Request body if needed.
Click Send Request and inspect the response.
Why use CeevTech API Tester?
Checking whether an endpoint works should not require installing a desktop client. CeevTech API Tester sends GET, POST, PUT, PATCH, DELETE or HEAD requests with your own headers and body. It then shows the status code, response headers, response time and body, and pretty-prints JSON responses. Requests go through a CeevTech relay, so you can test public REST APIs online without browser CORS errors.
- Fast: processes your code or data in seconds.
- Private: HTTPS transfers, and files are deleted automatically.
- Works everywhere: desktop, tablet and phone, in any modern browser.
- One account, 79+ tools: PDF, image, office, AI, developer and business tools in one place.
Frequently asked questions
Can I test localhost or an internal API?
No. Requests are relayed from CeevTech's server, which refuses private, internal and loopback addresses. Only public http and https endpoints work.
Does it follow redirects?
No. A redirect is shown as its 3xx status and headers. Requests time out after 15 seconds, and response bodies are cut off at 200 KB.
Is API Tester free?
Included in CeevTech Pro. Every new account gets a 30-day Pro trial, no credit card required.
Do I need to install anything?
No. API Tester runs online in your browser on Windows, Mac, Linux, Android and iPhone.
Is my data private?
Yes. Everything is transferred over HTTPS, and uploaded files are deleted automatically after processing. Only you can access your results.