Your HTTP Headers Are a Security Report Card — This Free Tool Grades Them Instantly

If you run a website, your HTTP response headers are the first thing a browser sees before it renders a single pixel. They tell the browser how to behave, what to cache, and crucially — how to protect your users. Yet most developers never actually read their headers, let alone audit them.

I used to be one of them. I’d set up a server, enable HTTPS, maybe add an HSTS line if I remembered, and move on. It wasn’t until I joined a security-conscious team that I realized how many critical protections were missing from my projects. And when I looked for a simple, free tool to analyze my headers, I found that the existing options were either too technical, too slow, or too opaque.

So I built one myself. DevToolbox HTTP Header Analyzer grades your security headers from A+ to F, explains every header in plain English, and tells you exactly what to fix — all without sending your data to any server.

What It Does (That Other Tools Don’t)

Instant Security Score (A+ to F)