Web Diagnostics

This page gathers three free tools for diagnosing a page or an address. Breakpoint tester shows which thresholds match a width, HTTP header analysis inspects status and headers, and Verify a redirect examines status and destination. They help front-end developers and content administrators understand behaviour before fixing it. They require no sign-up and run in the browser.

Start with Breakpoint tester if you are checking a layout at different widths. Use HTTP header analysis to read the status and headers of an address. Choose Verify a redirect when you need to follow the status and destination of a link. The three tools answer distinct questions: display thresholds, technical response, and redirection.

How to use

  1. For layout work, start with Breakpoint tester to see which thresholds match the tested width.
  2. For an address, use HTTP header analysis to read the returned status and headers before changing anything.
  3. If a link changes destination, choose Verify a redirect to inspect the status and final destination.
  4. After each test, note the threshold, status, or destination you observe so you can compare the diagnosis before and after a fix.

Frequently asked questions

Which tool checks a redirect?

Verify a redirect inspects the status and destination of an address. It helps you understand where a link leads. The tool is free and requires no sign-up.

What are breakpoints used for?

Breakpoint tester shows which thresholds match a width. This helps check a responsive layout. The tool is free, requires no sign-up, and stays in your browser.

Can I inspect the headers of an address?

Yes. HTTP header analysis inspects the status and headers of an address. You get technical information useful for diagnosis. The tool is free and requires no sign-up.

How do I diagnose an incorrect responsive display?

Start with Breakpoint tester to check which thresholds match the width involved. Then compare with the layout seen on the device. If the issue comes from an address or an asset, HTTP header analysis can help you read the technical response.

What order should I follow to analyse a suspicious address?

Inspect the status and headers first with HTTP header analysis. If the result shows a move, use Verify a redirect to follow the status and destination. Finish by checking that the final address matches what you expect.

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