Online Header Checker

Check and analyze HTTP headers from any URL or file to inspect response codes, security headers, and server configurations.

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6,412+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

The Online Header Checker is a powerful tool that allows you to analyze HTTP headers from any website URL or uploaded file. Simply enter a URL or upload a file containing URLs, and the tool will fetch and display all HTTP headers including status codes, content-type, cache-control, security headers (like HSTS, CSP), and server information. This is essential for web developers, SEO specialists, and security professionals to verify proper server configurations, troubleshoot issues, and ensure security best practices.

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How to Use

Enter a URL in the input field (e.g., https://example.com) OR click 'Upload File' to select a text file containing URLs (one per line).
Click the 'Check Headers' button to initiate the header analysis.
View the results showing all HTTP headers returned by the server, organized in a clean table format.
For multiple URLs from a file, results will be displayed sequentially with clear separation.

Frequently Asked Questions

Find Quick Answers

What are HTTP headers and why should I check them?

HTTP headers are metadata sent by web servers with each response. They control caching, security, content types, and more. Checking them helps ensure proper website configuration, security, and performance.

Can I check headers for multiple URLs at once?

Yes! You can upload a text file containing multiple URLs (one per line), and the tool will check headers for each URL and display all results in sequence.

Does this tool store or log the URLs I check?

No. All header checks are performed in real-time via your browser, and no data is stored on our servers. The tool operates entirely client-side for privacy.

What information do the headers provide?

Headers include status codes (200, 404, etc.), content-type (HTML, JSON, etc.), cache directives, security headers (HSTS, CSP), server type, date, and other technical details about the server response.

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