Free Web Tools

Free web tools to check your public IP, scan QR codes, test internet speed, inspect HTTP headers, check website status, and detect user agents.

Choose a tool and get an instant result

BlinkCalc tools are designed to be fast, practical, privacy-conscious, and easy to understand. Every result is calculated in your browser.

Frequently asked questions

How do you know my public IP?

We call a free public IP lookup API from your browser and display the result. We don't keep a copy of it.

Is your internet speed test accurate?

It uses the same technique as most browser speed tests: downloading and uploading test data to a CDN endpoint. Results are usually within 5–10% of dedicated speed test sites.

Can I check if a website is down without installing anything?

Yes. The website status checker sends a request from your browser and reports the HTTP status code and response time.