Online Website Uptime Checker

What Can the Uptime Checker Do?

The online website uptime checker is a free pure frontend tool that helps you quickly check the online status of multiple websites. It sends HTTP requests directly from your browser to get status codes, response times, and SSL information — no software installation needed.

Core Features

• Batch Check: Enter multiple URLs at once, check each sequentially
• HTTP Status Code: Get 200/301/403/404/500 status codes
• Response Time: Measure request-to-response latency
• SSL Check: Verify if HTTPS is enabled
• Export Results: One-click copy results to clipboard

How to Use

1. Enter URLs to check in the input box, one per line
2. Click "Start Check"
3. Wait for results showing status code, response time, and SSL status
4. Click "Copy Results" to export

Use Cases

Ops Patrol

Operations engineers can quickly batch-check multiple services' online status and catch anomalies early. Lighter and faster than logging into monitoring platforms.

Post-Deploy Verification

After deploying a new version, quickly verify all service URLs respond normally to confirm successful deployment.

Competitor Monitoring

Track competitor website availability to understand their service stability.

Extended Knowledge

Website uptime is a core service quality metric, typically expressed as a percentage (e.g., 99.9%). HTTP status codes indicate server response: 2xx = success, 3xx = redirect, 4xx = client error, 5xx = server error. SSL/TLS certificates provide encrypted connections, the foundation of modern web security. This tool uses the browser's fetch API, subject to CORS policy — some cross-origin requests may not return full response details.

FAQ