Security Headers Checker
Inspect any website's HTTP security headers — HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy. Scored report with severity levels and recommended fixes.
Data handling: The target URL is sent to allorigins.win, which fetches the page to retrieve its response headers.
About Security Headers Checker
Security Headers Checker provides a dedicated, focused workspace: Inspect any website's HTTP security headers — HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy. Scored report with severity levels and recommended fixes. Using it is a three-step job: 1) Open Security Headers Checker and review the inputs, units, and data-handling notice shown on its page, 2) Enter the information requested by this tool and adjust only the options that apply to your task, 3) Review the result and use the available copy, download, or reset controls. Built as a focused utility in our security library, it is available in a modern desktop or mobile browser without requiring account registration or software installation.
Security Headers Checker is a free, browser-based security headers checker from ProfitTool. Inspect any website's HTTP security headers — HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy. Scored report with severity levels and recommended fixes. Review any usage notes shown on this page before relying on its availability. Review the tool's data-handling notice before entering sensitive information; some features store settings locally or contact external services.
Pairs naturally with the DKIM Record Checker — CORS Header Checker handles the follow-up case.
Technical Limitations & Boundary Conditions
- Results reflect the inputs and assumptions shown. Fees, taxes, rates, and personal circumstances can change the real-world outcome; verify important figures with the relevant provider or authority.
- Extreme values outside standard ranges may be constrained by device memory or numerical precision boundaries.
Key Terms Explained
- Entropy
- A measure of unpredictability in bits. Each extra bit doubles the guessing effort; 80+ bits is a sensible floor.
- Passphrase
- Several random words joined together — easier to type and remember than a short random string, and usually stronger.
- Hashing
- A one-way transform of data. Unlike encryption, it cannot be reversed.
- Credential stuffing
- Attackers replaying username/password pairs leaked from one site against many others.
Data Handling
Data handling depends on this tool's implementation. Read the Data handling notice above the tool before entering sensitive information. Some features run locally; others contact named providers or ProfitTool services. Site analytics, advertising, and embedded resources may also make separate requests.
Industry Best Practices
- Read the field labels, units, and instructions before using Security Headers Checker.
- Keep a copy of important source material when the operation could change or transform it.
- Review the result before sharing or relying on it; check the page for available copy or download controls.
- Cross-check consequential results against an authoritative source; this tool does not replace professional advice.
- Review Security Headers Checker's data-handling notice before entering sensitive information.
Common Mistakes to Avoid
Substituting characters and calling it strong
P@ssw0rd1 is on every cracking list. Randomness beats cleverness every time.
Storing generated secrets in notes apps
Use a real password manager with encryption at rest.
Reusing one strong password everywhere
One breach then exposes every account. Unique per site, always.
Working alongside the CORS Header Checker? HTTP Header Checker is the usual next step.
How to use Security Headers Checker
- 1Open Security Headers Checker and review the inputs, units, and data-handling notice shown on its page.
- 2Enter the information requested by this tool and adjust only the options that apply to your task.
- 3Review the result and use the available copy, download, or reset controls. Processing and storage behavior vary by tool.
If you came here from the HTTP Header Checker, DKIM Record Checker covers the other half of the workflow.
Frequently Asked Questions
Is anything I enter into Security Headers Checker sent over the internet?›
Do not enter a live password, key, or token unless you have checked the tool's data-handling notice and verified its behavior.
Is Security Headers Checker free to use?›
Yes — Security Headers Checker is completely free with no signup, watermark, trial or hidden paywall, however often you use it.
How strong should my output be?›
For anything valuable, aim for at least 16 characters with mixed classes, or a four-plus-word passphrase, and store it in a password manager.
Does Security Headers Checker work on mobile phones and tablets?›
Yes. The layout is mobile-first and tested on iOS Safari, Android Chrome and every current desktop browser, with tap targets sized for thumbs.
Can I trust a browser-based security headers checker?›
Read the Data handling notice above the tool to see whether inputs stay local or are sent to a provider.
Is my data safe when I use this security headers checker?›
Data handling varies by tool. Read the notice above the workspace to see whether your input stays in the browser or is sent to a named provider or service. Avoid entering sensitive information unless you understand that tool's handling.
Should I reuse results across accounts?›
Never. Generate a fresh value per account so a single breach cannot cascade into your other logins.
Why Use Security Headers Checker on ProfitTool?
Security Headers Checker sits inside ProfitTool's Security collection — 250+ tools for security-minded users, admins and privacy folks. Review this tool's inputs and data-handling notice before use.
Security Headers Checker is part of ProfitTool's security collection for security-minded users, admins and privacy folks. Review its documented inputs, assumptions, and data handling to decide whether it fits your task.
Guides that explain Security Headers Checker
Background reading from the ProfitTool Knowledge Hub.
How to Check SSL Certificate Expiry: 5 Methods
An expired SSL certificate blocks all users with a hard browser warning. Here are five ways to check certificate expiry before it becomes a problem.
Privacy & SecurityWhat Is a Wildcard SSL Certificate?
A wildcard SSL certificate secures a domain and all its direct subdomains with one certificate. How they work, why they stop at one level, and when to use one.