# API & Website Health Checks

> Point any of these at a live URL for an instant read: is it up, how fast does it respond, is the SSL certificate about to expire, and what do its response headers actually say about caching, CORS, and security.

## Tools

- [Website Speed Test](https://www.postman.com/tools/website-speed-test): The website speed checker measures how long a site takes to respond to a real request from a Postman server, reports the total response time and an estimated time to first byte, and grades the result as Fast or Slow.
- [Website Uptime Check](https://www.postman.com/tools/website-uptime-check): Is it up? tells you whether a website or API is responding right now by sending a real request from a Postman server and reporting whether anything came back, and how long it took.
- [API Health Check](https://www.postman.com/tools/api-health-check): API health check sends a real GET request to any endpoint and shows the status code, response time and payload size, graded Healthy or Unhealthy.
- [SSL Certificate Check](https://www.postman.com/tools/ssl-certificate-check): SSL certificate checker tells you when a domain's TLS certificate expires, who issued it, which hostnames it covers, and whether the chain is trusted, by opening a real TLS connection to the host and reading the certificate it presents.
- [HTTP Header Check](https://www.postman.com/tools/http-header-check): Response header checker sends one real GET request to a URL and explains every response header that comes back — what it does, what the value you have actually means, and what to change — grouped into security, CORS, caching and payload.

## About

- No account is required and there is nothing to install. Each tool's Privacy section explains what stays in your browser and what is sent to Postman.
- [Postman Tools](https://www.postman.com/tools) — every tool, not just this group.
- [llms.txt](https://www.postman.com/tools/llms.txt) — the same index in llms.txt form.