Security Headers Checker — see the real headers a site sends
Read the real security headers a website sends — fetched through this site's own server. For each header you see whether it is present, its exact value, whether it is weaker than recommended, and what the weakness means.
Category: Security & Privacy
About this tool
What Is Security Headers Checker? Security Headers Checker is a browser-based tool for Check and evaluate HTTP security headers for your site. This guide explains the result, the calculation or processing method, and correct usage. Calculation or Processing Method The tool applies the operation described in its interface: Check and evaluate HTTP security headers for your site. Processing method: The tool produces the result using a processing method appropriate to the input data type. How to Use It Open the tool and choose the required unit, mode, or options. Enter values or paste text into the input fields. Review the result, copy it, or continue with a related tool. Important Notes Use consistent units and verify values before calculating. Incomplete or invalid input can produce an incomplete result. Related Tools Tools that support the same workflow: Password Strength Checker — Check password strength and security level. Caesar Cipher — Encrypt and decrypt text using the classical Caesar cipher. ROT13 Encoder — Encode and decode text using ROT13 substitution cipher. Frequently Asked Questions How does Security Headers Checker work? The tool processes input according to its purpose: Check and evaluate HTTP security headers for your site. Are Security Headers Checker results accurate? Results are deterministic when input and units are correct.